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Washington. Godfrey, R. K. and J. W. Wooten. 1979. Aquatic and Wetland Plants of Southeastern United States: Monocotyledons. Athens, Ga. Haynes, R. R. and L. B.

familyPotamogetonaceae Show Lower Taxa Potamogeton, Stuckenia Dumortier Robert R. Haynes, C. Barre Hellquist Common names: Pondweed Family Treatment appears

in the flora). Dahlgren, R. M. T., H. T. Clifford, and P. F. Yeo. 1985. The Families of Monocotyledons. Berlin. Haynes, R. R. and L. B. Holm-Nielsen. 1985

107: 189--209. Haynes, R. R. 1977. The Najadaceae in the southeastern United States. J. Arnold Arbor. 58: 161--170. Shaffer- Thorne, R. F. 1993c. Hydrocharitaceae

Hydrocharis, Limnobium, Ottelia, Thalassia, Vallisneria A. L. de Jussieu Robert R. Haynes Common names: Tape-grass or Frog-bit Family Treatment appears in FNA

Sagittaria teres Linnaeus Sp. Pl. 2: 993. 1753; Gen. Pl. ed. 5; 429, 1754. Robert R. Haynes, C. Barre Hellquist Common names: Sagittaire Etymology: Latin sagitta

familyAponogetonaceae Show Lower Taxa Aponogeton J. Agardh C. Barre Hellquist, Robert R. Haynes Common names: Aponogeton or Cape-pondweed Family Treatment appears

LAYOUT:treatment:TUOYAL familyButomaceae Show Lower Taxa Butomus Richard Robert R. Haynes Common names: Flowering- Rrush Family Treatment appears in FNA Volume

Amsterdam. Haynes, R. R. and L. B. Holm-Nielsen. 1985. A generic treatment of Alismatidae in the Neotropics. Acta Amazon. 15(suppl.): 153--193. Phillips, R. C

familyCymodoceaceae Show Lower Taxa Halodule, Syringodium Norman Taylor Robert R. Haynes Common names: Manatee-grass Family Treatment appears in FNA Volume

Supplementum Plantarum 32, 214. 1782 (as distachyon). C. Barre Hellquist, Robert R. Haynes Common names: Cape-pondweed water-hawthorne Synonyms: Aponogeton distachyos

Linnaeus f. Supplementum Plantarum 32.; 214. 1782. C. Barre Hellquist, Robert R. Haynes Etymology: Greek, from aquatic habitat Treatment appears in FNA Volume

J. Bot. 34: 581--582. Haynes, R. R. 1979. Revision of North and Central American Najas (Najadaceae). Sida 8: 34--56. Haynes, R. R. and C. B. Hellquist.

1--183. Haynes, R. R. 1975. A revision of North American Potamogeton subsection Pusilli (Potamogetonaceae). Rhodora 76: 564--649. Haynes, R. R. 1985. A

triviale Linnaeus Sp. Pl. 1: 343. 1753; Gen. Pl. ed. 5; 160, 1754. Robert R. Haynes, C. Barre Hellquist Common names: Water-plantain Etymology: ancient

Les and R. R. Haynes 1995). Cronquist, A. 1981. An Integrated System of Classification of Flowering Plants. New York. Les, D. H. and R. R. Haynes. 1995.

familyLimnocharitaceae Show Lower Taxa Hydrocleys Takhtajan ex Cronquist Robert R. Haynes Common names: Water-poppy Ffamily Treatment appears in FNA Volume 22

AL familyRuppiaceae Show Lower Taxa Ruppia Horaninow ex Hutchinson Robert R. Haynes Common names: Ditch-grass Family Treatment appears in FNA Volume 22

LAYOUT:treatment:TUOYAL familyZannichelliaceae Show Lower Taxa Zannichellia Dumortier Robert R. Haynes, C. Barre Hellquist Common names: Horned- pondweed Family Treatment

Bremen 21: 258. 1912. Robert R. Haynes, C. Barre Hellquist Common names: Potamot Synonyms: Coleogeton (Reichenbach) Les & R. R. Haynes Treatment appears in

Echinodorus tenellus Richard & Engelmann ex A. Gray Manual 460. 1848. Robert R. Haynes, C. Barre Hellquist Etymology: Greek echius, rough husk, and doros

umbellatus Linnaeus Sp. Pl. 1: 372. 1753; Gen. Pl. ed. 5; 174, 1754. Robert R. Haynes Common names: Flowering-rush Etymology: Greek butomos/butomon, marsh

genusButomus speciesButomus umbellatus Linnaeus Sp. Pl. 1: 372. 1753. Robert R. Haynes WeedyIntroducedIllustrated Treatment appears in FNA Volume 22. Illustrator:

speciesAlisma subcordatum Rafinesque Medical Repository hexade 2, 5:354. 1808. Robert R. Haynes, C. Barre Hellquist Common names: Southern water-plantain alisma subcorde

Koniglichen Gesellschaft der Wissenschaften zu Gottingen 7: 257. 1857. Robert R. Haynes, C. Barre Hellquist Illustrated Basionym: Alisma cordifolia Linnaeus

Mathematiques et Physiques de L'Institut National de France 12(2): 19. 1814. Robert R. Haynes IntroducedIllustrated Treatment appears in FNA Volume 22. Illustrator:

Cook, C. D. K., and R. Lüönd. 1983. A revision of the genus Blyxa (Hydrocharitaceae). Aquatic Bot. 15: 1--52. Thieret, J. W., R. R. Haynes, and D. H. Dike

Ascherson Sitzungsber. Ges. Naturf., Freunde Berlin. 1868:19. 1868. Robert R. Haynes Illustrated Synonyms: Diplanthera beaudettei Hartog Halodule beaudettei (Hartog)

Triglochin striata Linnaeus Sp. Pl. 1: 338. 1753; Gen. Pl. ed. 5; 157, 1754. Robert R. Haynes, C. Barre Hellquist Common names: Arrow-grass troscart Etymology: Greek

speciesEchinodorus cordifolius subspeciesEchinodorus cordifolius subsp. cordifolius Robert R. Haynes, C. Barre Hellquist Illustrated Synonyms: Echinodorus radicans Treatment

montevidensis subsp. spongiosa Chamisso & Schlechtendal Linnaea 2: 156. 1827. Robert R. Haynes, C. Barre Hellquist Common names: Sagittaire spongieuse WeedyIllustrated

zu Bremen 2: 2.1869; Index Crit. Butom. Alism. Juncagin., 2, 1868. Robert R. Haynes Common names: Water-poppy IntroducedIllustrated Basionym: Stratiotes

Halophila johnsonii Thouars Genera Nova Madagascariensia 2. 1806. Robert R. Haynes Etymology: Greek halo, sea, and philein, to love Treatment appears

(Sprengel) Magnus Beitrage zur Kenntniss der Gattung Najas 8. 1870. Robert R. Haynes Weedy Basionym: Caulinia guadalupensis Sprengel Syst. Veg. 1: 20. 1824

canadensis, Elodea nuttallii Michaux Flora Boreali-Americana 1: 20. 1803. Robert R. Haynes Common names: Water-weed Etymology: Greek helodes, marshy Treatment

speciesSyringodium filiforme Kutzing in R. F. Hohenacker, Algae Marinae Exsiccatae 9: 426. 1860. Robert R. Haynes Illustrated Synonyms: Cymodocea filiformis (Kützing)

genusZannichellia speciesZannichellia palustris Linnaeus Sp. Pl. 2: 969. 1753. Robert R. Haynes, C. Barre Hellquist Illustrated Treatment appears in FNA Volume 22

Phyllospadix torreyi Hooker Flora Boreali-Americana 2: 171. 1838. Robert R. Haynes Common names: Surf-grass Etymology: Greek phyllon, leaf, and spadix

in G. Bentham, Plantas Hartwegianas imprimis Mexicanas. 341. 1857. Robert R. Haynes, C. Barre Hellquist IllustratedEndemic Synonyms: Machaerocarpus californicus (Torrey)

von Humboldt and A. J. Bonpland, Plantae Aequinoctiales 1: 221. 1808. Robert R. Haynes, C. Barre Hellquist Common names: Flowering-quillwort Etymology: for

californicum Miller The Gardeners Dictionary (fourth edition) 1: 28. 1754. Robert R. Haynes, C. Barre Hellquist Etymology: Greek, ancient name Synonyms: Machaerocarpus Small

Planchon Annales des Sciences Naturelles, Botanique sér. 3, 11: 80. 1849. Robert R. Haynes Common names: Water-weed WeedyIntroducedIllustrated Treatment appears

speciesTriglochin maritima Linnaeus Sp. Pl. 1: 339. 1753 (as maritimum). Robert R. Haynes, C. Barre Hellquist Common names: Arrow grass Troscart maritime WeedyIllustrated

useful discoveries and improvements in rural affairs 7: 180. 1841. Robert R. Haynes, C. Barre Hellquist Common names: Robbins' pondweed fern pondweed potamot

graminea subsp. weatherbiana Michaux Flora Boreali-Americana 2: 190. 1803. Robert R. Haynes, C. Barre Hellquist Common names: Sagittaire a feuilles de graminees

occidentalis (Persoon) Börner Flora fur das deutsche Volk 713. 1912. Robert R. Haynes, C. Barre Hellquist Common names: Threadleaf-pondweed Basionym: Potamogeton

subsp. foliosus Rafinesque Medical Repository hexade 2, 5:354. 1808. Robert R. Haynes, C. Barre Hellquist WeedyIllustrated Treatment appears in FNA Volume

maritima Linnaeus Sp. Pl. 1: 127. 1753;, Gen. Pl. ed. 5; 61, 1754. Robert R. Haynes Common names: Ditch-grass widgeon grass Rruppia Etymology: fFor Heinrich

de L'Institut National de France 12(2): 9, 61, 73, plate 2a–k. 1814. Robert R. Haynes Etymology: Greek hydr-, water, and -illa, diminutive Treatment appears

K. and R. Lüönd. 1982. A revision of the genus Hydrocharis (Hydrocharitaceae). Aquatic Bot. 14: 177--204. Roberts, M. L., R. L. Stuckey, and R. S. Mitchell

Taxa Halodule wrightii Endlicher Gen. Pl., Suppl. 1(2): 1368. 1841. Robert R. Haynes Etymology: Greek halos, salt Basionym: Diplanthera Thouars Gen. Nov

speciesElodea nuttallii (Planchon) H. St. John Rhodora 22:29. 1920. Robert R. Haynes Illustrated Basionym: Anacharis nuttallii Planchon Ann. Mag. Nat. Hist

Zostera marina Linnaeus Sp. Pl. 2: 968. 1753; Gen. Pl. ed. 5; 415, 1754. Robert R. Haynes Common names: Eel-grass zostère Etymology: Greek zoster, belt Treatment

speciesAlisma triviale Pursh Flora Americae Septentrionalis 1: 252. 1814. Robert R. Haynes, C. Barre Hellquist Common names: Northern water-plantain alisma commun

lanceolatum Withering An Arrangement of British Plants (ed. 3) 2: 362. 1796. Robert R. Haynes, C. Barre Hellquist Introduced Treatment appears in FNA Volume 22.

Planchon Annales des Sciences Naturelles, Botanique sér. 3, 11: 79. 1849. Robert R. Haynes Common names: South American elodea Etymology: Latin egeri, a nymph

Sagittaria lancifolia subsp. media Linnaeus Syst. Nat. ed. 10 2: 1270. 1759. Robert R. Haynes, C. Barre Hellquist Treatment appears in FNA Volume 22. Herbs, perennial

Richard ex Steudel Nomenclator Botanicus. Editio secunda 2: 45. 1841. Robert R. Haynes Common names: American frogbit IllustratedEndemic Basionym: Hydrocharis

genusAlisma speciesAlisma plantago-aquatica Linnaeus Sp. Pl. 1: 342. 1753. Robert R. Haynes, C. Barre Hellquist Introduced Treatment appears in FNA Volume 22.

genusHydrocharis speciesHydrocharis morsus-ranae Linnaeus Sp. Pl. 2: 1036. 1753. Robert R. Haynes Common names: European frog-bit IntroducedIllustrated Treatment appears

nymphoides Richard Memoires du Museum d'Histoire Naturelle 1: 368. 1815. Robert R. Haynes Common names: Water-poppy Etymology: Greek hydro, water, and clavis

Mathematiques et Physiques de L'Institut National de France 12(2): 66. 1814. Robert R. Haynes Common names: American frog-bit Etymology: Greek limnobios, living

speciesAlisma gramineum Lejeune Flore des Environs de Spa 1: 175. 1811. Robert R. Haynes, C. Barre Hellquist Common names: Grass-leaved water-plantain alisma

Taxa Syringodium filiforme Kutzing in R. F. Hohenacker, Algae Marinae Exsiccatae 9: 426. 1860. Robert R. Haynes Common names: Manatee-grass Treatment appears

guayanensis Kunth in A. von Humboldt et al., Nov. Gen. Sp. 1: 250. 1816. Robert R. Haynes, C. Barre Hellquist Introduced Treatment appears in FNA Volume 22.

palustris Linnaeus Sp. Pl. 2: 969. 1753; Gen. Pl. ed. 5; 416, 1754. Robert R. Haynes, C. Barre Hellquist Common names: Horned-pondweed Etymology: for Gian

speciesOttelia alismoides (Linnaeus) Persoon Syn. Pl. 1: 400. 1805. Robert R. Haynes Common names: Duck-lettuce WeedyIntroducedIllustrated Basionym: Stratiotes

Tuckerman American Journal of Science, and Arts ser. 2, 6:225. 1848. Robert R. Haynes, C. Barre Hellquist Common names: Broad-leaved pondweed potamot à grandes

pusillus subsp. tenuissimus Linnaeus Sp. Pl. 1: 127. 1753 (as pusillum). Robert R. Haynes, C. Barre Hellquist Weedy Treatment appears in FNA Volume 22. Rhizomes

diversifolius Rafinesque Medical Repository hexade 2, 5:354. 1808. Robert R. Haynes, C. Barre Hellquist Common names: Water-thread pondweed Illustrated

genusEchinodorus speciesEchinodorus floridanus R. R. Haynes & Burkhalter Castanea 63: 180, fig. 1. 1998. Robert R. Haynes, C. Barre Hellquist EndemicConservation

testudinum Banks & Solander ex K. D. König Annals of Botany 2: 96. 1805. Robert R. Haynes Common names: Turtle-grass Etymology: Greek thalass, sea Treatment

speciesVallisneria americana Michaux Flora Boreali-Americana 2: 220. 1803. Robert R. Haynes Common names: Eel-grass Illustrated Synonyms: Vallisneria neotropicalis Victorin

G. Smith Rep. (Annual) Missouri Bot. Gard. 6:115, plate 53. 1895. Robert R. Haynes, C. Barre Hellquist IllustratedEndemic Treatment appears in FNA Volume

familyRuppiaceae genusRuppia speciesRuppia maritima Linnaeus Sp. Pl. 1: 127. 1753. Robert R. Haynes Common names: Ruppie maritime Illustrated Synonyms: Ruppia maritima

americana Linnaeus Sp. Pl. 2: 1015. 1753; Gen. Pl. ed. 5; 446, 1754. Robert R. Haynes Common names: Wild-celery Etymology: for Antonio Vallisneri, Italian

genusOttelia Show Lower Taxa Ottelia alismoides Persoon Syn. Pl. 1: 400. 1805. Robert R. Haynes Etymology: Malay am ottelambel, apparently from otta, to stick to,

Proceedings of the American Academy of Arts and Sciences 14: 303. 1879. Robert R. Haynes Common names: Torrey’s surf-grass Illustrated Treatment appears in

papillosa Buchenau Index Crit. Butom. Alism. Juncagin. 27, 44. 1868. Robert R. Haynes, C. Barre Hellquist IllustratedEndemic Treatment appears in FNA Volume

speciesPhyllospadix scouleri Hooker Flora Boreali-Americana 2: 171. 1838. Robert R. Haynes Common names: Scouler’s surf-grass Illustrated Treatment appears in

speciesPotamogeton crispus Linnaeus Sp. Pl. 1: 126. 1753 (as crispum). Robert R. Haynes, C. Barre Hellquist Common names: Curled pondweed potamot crepu WeedyIllustrated

familyNajadaceae genusNajas speciesNajas filifolia R. R. Haynes Brittonia 37: 392. 1985. Robert R. Haynes IllustratedEndemicConservation concern Treatment

familyNajadaceae genusNajas speciesNajas marina Linnaeus Sp. Pl. 2: 1015. 1753.. Robert R. Haynes Common names: Spiny naiad Illustrated Synonyms: Najas gracilis (Morong)

(Willdenow) Rostkovius & W. L. E. Schmidt Flora Sedinensis 382. 1824. Robert R. Haynes Illustrated Basionym: Caulinia flexilis Willdenow Mém. Acad. Roy. Sci

familyZosteraceae genusZostera speciesZostera marina Linnaeus Sp. Pl. 2: 968. 1753. Robert R. Haynes Common names: Zostère marine Illustrated Synonyms: Zostera marina var

platyphylla (Engelmann) J. G. Smith N. Amer. Sagittaria. 29. 1894. Robert R. Haynes, C. Barre Hellquist Illustrated Basionym: Sagittaria graminea var.

pectinata (Linnaeus) Borner Flora fur das deutsche Volk 713. 1912. Robert R. Haynes, C. Barre Hellquist Common names: Sago-pondweed potamot pectine Illustrated

genusSagittaria speciesSagittaria latifolia Willdenow Sp. Pl. 4(1): 409. 1805. Robert R. Haynes, C. Barre Hellquist Common names: Wapato common arrowhead duck-potato sagittaire

speciesSagittaria rigida Pursh Flora Americae Septentrionalis 2: 397. 1814. Robert R. Haynes, C. Barre Hellquist Common names: Sessile-fruited arrowhead Sagittaire

J. Koch in J. C. Röhling et al., Deutschl. Fl., ed. 3 1: 855. 1823. Robert R. Haynes, C. Barre Hellquist Common names: Potamot à feuilles obtuses Illustrated

tenellus (Martius) Buchenau Index Crit. Butom. Alism. Juncagin. 21. 1868. Robert R. Haynes, C. Barre Hellquist Basionym: Alisma tenellum Martius in J. J. Roemer

brevirostra Mackenzie & Bush Rep. (Annual) Missouri Bot. Gard. 16:102. 1905. Robert R. Haynes, C. Barre Hellquist Common names: Midwestern arrowhead IllustratedEndemic

Bennett) Rydberg Bulletin of the Torrey Botanical Club 32: 599. 1905. Robert R. Haynes, C. Barre Hellquist Common names: Potamot de Richardson WeedyIllustratedEndemic

Memoirs of the american academy of arts and science n.s. 17:36. 1932. Robert R. Haynes, C. Barre Hellquist Common names: Flatstem pondweed potamot zostériforme

speciesEchinodorus berteroi (Sprengel) Fassett Rhodora 57:139. 1955. Robert R. Haynes, C. Barre Hellquist Basionym: Alisma berteroi Sprengel Syst. Veg. 2:

speciesHalophila johnsonii Eiseman Aquatic Botany 9: 16, fig. 1. 1980. Robert R. Haynes EndemicConservation concern Treatment appears in FNA Volume 22. Rhizomes

decipiens Ostenfeld Botanisk Tidsskrift 24:260, fig. s.n. [p. 261]. 1902. Robert R. Haynes Treatment appears in FNA Volume 22. Rhizomes with 2 scales at each

Rafinesque Medical Repository 5: 354. 1808, hexade hexade 2; 3; 2:409. 1811. Robert R. Haynes, C. Barre Hellquist Common names: Ribbon-leaf pondweed potamot emerge

Sheldon Bulletin of the Torrey Botanical Club 20:283, plate 159. 1893. Robert R. Haynes, C. Barre Hellquist Common names: Northern arrowhead wapato Sagittaria

speciesElodea canadensis Michaux Flora Boreali-Americana 1: 20. 1803. Robert R. Haynes Synonyms: Elodea brandegeeae H. St. John Treatment appears in FNA Volume

Anleitung zu Wissenschaftlichen Beobachtungen auf Reisen 368. 1875. Robert R. Haynes Illustrated Treatment appears in FNA Volume 22. Illustrator: John Myers

academy of arts and science n.s. 17:79, plates 15, 30, fig. 5. 1932. Robert R. Haynes, C. Barre Hellquist EndemicConservation concern Treatment appears in

Illustrations of the Botany... of the Himalayan Mountains... 1: 376. 1839. Robert R. Haynes WeedyIntroducedIllustrated Basionym: Serpicula verticillata Linnaeus

Research Studies of the State College of Washington 30(2): 23. 1962. Robert R. Haynes Endemic Synonyms: Elodea longivaginata H. St. John Treatment appears

Reichenbach et al., Icones florae germanicae et helveticae 7: 13. 1845. Robert R. Haynes, C. Barre Hellquist Common names: Alga pondweed Tuckerman’s pondweed potamot

Memoirs of the american academy of arts and science 17: 112. 1932. Robert R. Haynes, C. Barre Hellquist Common names: Snail-seed pondweed Endemic Synonyms:

speciesSagittaria lancifolia subspeciesSagittaria lancifolia subsp. lancifolia Robert R. Haynes, C. Barre Hellquist Synonyms: Sagittaria angustifolia Treatment appears

genusPotamogeton speciesPotamogeton alpinus Balbis Misc. Bot. 13. 1804. Robert R. Haynes, C. Barre Hellquist Common names: Potamot alpin Illustrated Synonyms:

subspeciesSagittaria graminea subsp. weatherbiana (Fernald) R. R. Haynes & Hellquist Novon 6: 371. 1996. Robert R. Haynes, C. Barre Hellquist Endemic Basionym: Sagittaria

subspeciesSagittaria graminea subsp. chapmanii (J. G. Smith) R. R. Haynes & Hellquist Novon 6: 370. 1996. Robert R. Haynes, C. Barre Hellquist Endemic Basionym: Sagittaria

speciesSagittaria graminea subspeciesSagittaria graminea subsp. graminea Robert R. Haynes, C. Barre Hellquist Common names: Sagittaire graminoide Synonyms: Sagittaria

montevidensis subspeciesSagittaria montevidensis subsp. montevidensis Robert R. Haynes, C. Barre Hellquist Treatment appears in FNA Volume 22. Herbs, perennial

speciesStuckenia filiformis subspeciesStuckenia filiformis subsp. filiformis Robert R. Haynes, C. Barre Hellquist Treatment appears in FNA Volume 22. Stems 10–30

(Micheli) Bogin Memoirs of the New York Botanical Garden 9: 214. 1955. Robert R. Haynes, C. Barre Hellquist Basionym: Sagittaria lancifolia var. media Micheli

floridana (R. R. Haynes & Wentz) R. R. Haynes & Hellquist Novon 6: 371. 1996. Robert R. Haynes WeedyEndemic Basionym: Najas guadalupensis var. floridana R. R.

subspeciesPotamogeton foliosus subsp. fibrillosus (Fernald) R. R. Haynes & Hellquist Novon 6: 370. 1996. Robert R. Haynes, C. Barre Hellquist EndemicConservation concern

subspeciesNajas guadalupensis subsp. muenscheri (R. T. Clausen) R. R. Haynes & Hellquist Novon 6: 371. 1996. Robert R. Haynes EndemicConservation concern Basionym:

subsp. tenuissimus (Mertens & W. D. J. Koch) R. R. Haynes & Hellquist Novon 6: 370. 1996. Robert R. Haynes, C. Barre Hellquist Common names: Potamot très

guadalupensis subsp. olivacea (Rosendahl & Butters) R. R. Haynes & Hellquist Novon 6: 371. 1996. Robert R. Haynes WeedyEndemic Basionym: Najas olivacea Rhodora

pusillus subsp. gemmiparus (J. W. Robbins) R. R. Haynes & Hellquist Novon 6: 370. 1996. Robert R. Haynes, C. Barre Hellquist Common names: Potamot gemmipare

subspeciesStuckenia filiformis subsp. alpina (Blytt) R. R. Haynes Novon 8: 241. 1998. Robert R. Haynes, C. Barre Hellquist Common names: Potamot filiforme

subspeciesStuckenia filiformis subsp. occidentalis (J. W. Robbins) R. R. Haynes Novon 8: 241. 1998. Robert R. Haynes, C. Barre Hellquist Common names: Potamot filiforme

(E. C. Ogden 1943; R. R. Haynes 1978). Four populations of the taxon were reported from Santa Rosa County, Florida (G. S. Wilhelm and R. H. Mohlenbrock 1986)

speciesTriglochin striata Ruiz & Pavón Flora Peruviana 3: 72. 1802 (as striatum). Robert R. Haynes, C. Barre Hellquist Treatment appears in FNA Volume 22. Plants with

A. Braun Sitzungsber. Ges. Naturf., Freunde Berlin. 1868:17. 1868. Robert R. Haynes WeedyIntroduced Treatment appears in FNA Volume 22. Stems profusely

cirrhosa (Petagna) Grande Bull. Orto Bot. Regia Univ. Naapoli 5: 58. 1918. Robert R. Haynes Basionym: Buccaferrea cirrhosa Petagna Instit. Bot.anicae 5: 1826.

speciesPotamogeton pusillus subspeciesPotamogeton pusillus subsp. pusillus Robert R. Haynes, C. Barre Hellquist Common names: Potamot nain Synonyms: Potamogeton

speciesPotamogeton foliosus subspeciesPotamogeton foliosus subsp. foliosus Robert R. Haynes, C. Barre Hellquist Common names: Leafy pondweed potamot feuille Synonyms:

engelmanniana J. G. Smith Memoirs of the Torrey Botanical Club 5: 25. 1894. Robert R. Haynes, C. Barre Hellquist Common names: Acid-water arrowhead Endemic Treatment

speciesTriglochin palustris Linnaeus Sp. Pl. 1: 338. 1753 (as palustre). Robert R. Haynes, C. Barre Hellquist Common names: Troscart des marais Treatment appears

Manual of Botany of the Northern United States (ed. 6) 555. 1890. Robert R. Haynes, C. Barre Hellquist Common names: Quill-leaved sagittaria Endemic Treatment

speciesPhyllospadix serrulatus Ruprecht ex Ascherson Linnaea 35: 169. 1868. Robert R. Haynes Treatment appears in FNA Volume 22. Herbs; nodes with 2 roots. Leaves:

speciesNajas guadalupensis subspeciesNajas guadalupensis subsp. guadalupensis Robert R. Haynes Treatment appears in FNA Volume 22. Stems 11–75 cm × 0.1–0.8 mm. Leaves

speciesStuckenia striata (Ruiz & Pavon) Holub Preslia 68: 364. 1997. Robert R. Haynes, C. Barre Hellquist Common names: Nevada-pondweed Basionym: Potamogeton

speciesSagittaria secundifolia Kral Brittonia 34: 12, fig.1. 1982. Robert R. Haynes, C. Barre Hellquist EndemicConservation concern Treatment appears in

(Engelmann) Bogin Memoirs of the New York Botanical Garden 9:197. 1955. Robert R. Haynes, C. Barre Hellquist Basionym: Sagittaria calycina Engelmann in W. H

genusNajas speciesNajas minor Allioni Flora Pedemontana 2: 221. 1785. Robert R. Haynes WeedyIntroduced Treatment appears in FNA Volume 22. Stems profusely

(Engelmann) Bogin Memoirs of the New York Botanical Garden 9: 198. 1955. Robert R. Haynes, C. Barre Hellquist Common names: Tidal arrowhead Endemic Basionym:

kurziana Glück Bulletin of the Torrey Botanical Club 54: 257. 1927. Robert R. Haynes, C. Barre Hellquist Endemic Treatment appears in FNA Volume 22. Herbs

genusSagittaria speciesSagittaria sanfordii Greene Pittonia 2: 158. 1890. Robert R. Haynes, C. Barre Hellquist EndemicConservation concern Treatment appears in

speciesSagittaria ambigua J. G. Smith N. Amer. Sagittaria. 22, plate 17. 1894. Robert R. Haynes, C. Barre Hellquist EndemicConservation concern Treatment appears in

Kongl. Svenska Vetenskapsakademiens Handlingar n.s. 55(5): 127. 1916. Robert R. Haynes, C. Barre Hellquist EndemicConservation concern Synonyms: Potamogeton

Description de l'Egypte... Histoire Naturelle 282, plate 50, fig. 3. 1813. Robert R. Haynes WeedyIntroduced Treatment appears in FNA Volume 22. Stems sparingly

speciesThalassia testudinum Banks ex K. D. König Annals of Botany 2: 96. 1805. Robert R. Haynes Illustrated Treatment appears in FNA Volume 22. Illustrator: John Myers

demersa J. G. Smith N. Amer. Sagittaria. 32, plate 15, figs. 1–4. 1894. Robert R. Haynes, C. Barre Hellquist Treatment appears in FNA Volume 22. Herbs, annual

39: 1271, figs. 1, 2 Aa, 3, 4 Aa, 5 a, e, f, 6. 1961 (as gaspense). Robert R. Haynes, C. Barre Hellquist Treatment appears in FNA Volume 22. Plants with

Proceedings of the Davenport Academy of Natural Sciences 4: 29. 1883. Robert R. Haynes, C. Barre Hellquist Endemic Synonyms: Sagittaria graminea var. cristata (Engelmann)

Journal of the Elisha Mitchell Society 76: 76, fig. 3, map 5. 1960. Robert R. Haynes, C. Barre Hellquist EndemicConservation concern Treatment appears in

longiloba Engelmann ex J. G. Smith N. Amer. Sagittaria. 16, plate 11. 1894. Robert R. Haynes, C. Barre Hellquist Weedy Synonyms: Sagittaria greggii J. G. Smith

speciesSagittaria guayanensis subspeciesSagittaria guayanensis subsp. guayanensis Robert R. Haynes, C. Barre Hellquist Treatment appears in FNA Volume 22. Herbs, annual

Graebner in H. G. A. Engler, Das Pflanzenreich 31[IV,11]: 32. 1907. Robert R. Haynes Introduced Synonyms: Zostera americana Hartog Treatment appears in

speciesPotamogeton ogdenii Hellquist & R. L. Hilton Systematic Botany 8: 88, figs. 1–3, plates 1–2, figs. 1–3. 1983. Robert R. Haynes, C. Barre Hellquist Common names:

vaginata (Turczaninow) Holub Folia Geobot. Phytotax. 19: 215. 1984. Robert R. Haynes, C. Barre Hellquist Common names: Bigsheath-pondweed potamot engainé

pulcher Tuckerman American Journal of Science, and Arts 45:38. 1843. Robert R. Haynes, C. Barre Hellquist Common names: Spotted pondweed potamot gracieux

Manual of Botany of the Northern United States (ed. 5) 485. 1867. Robert R. Haynes, C. Barre Hellquist Common names: Oakes pondweed potamot d’Oakes Endemic

speciesPotamogeton perfoliatus Linnaeus Sp. Pl. 1: 126. 1753 (as perfoliatum). Robert R. Haynes, C. Barre Hellquist Common names: Potamot perfolié Treatment appears

filiformis J. G. Smith N. Amer. Sagittaria. 20, plate 15, figs. 5–8. 1894. Robert R. Haynes, C. Barre Hellquist Endemic Synonyms: Sagittaria stagnorum Small Sagittaria

genusPotamogeton speciesPotamogeton natans Linnaeus Sp. Pl. 1: 126. 1753. Robert R. Haynes, C. Barre Hellquist Common names: Floating-leaf pondweed potamot flottat

herausgegeben vom naturwissenschaftlichen Vereine zu Bremen 2: 490. 1871. Robert R. Haynes, C. Barre Hellquist Basionym: Alisma subulatum Linnaeus Sp. Pl. 1:

Engelmann) Magnus Beitrage zur Kenntniss der Gattung Najas 23. 1870. Robert R. Haynes Endemic Basionym: Najas indica var. gracillima A. Braun ex Engelmann

Encyclopedie Methodique. Botanique... Supplement 4(2): 5354. 1816. Robert R. Haynes, C. Barre Hellquist Common names: Long-leaf pondweed potamot noeuex

Tuckerman American Journal of Science, and Arts ser. 2, 6:228. 1848. Robert R. Haynes, C. Barre Hellquist Common names: Northern snailseed pondweed potamot

speciesPotamogeton friesii Ruprecht Hist. Stirp. Fl. Petrop. 43. 1845. Robert R. Haynes, C. Barre Hellquist Common names: Potamot de Fries Treatment appears

speciesPotamogeton strictifolius A. Bennett J. Bot. 40: 148. 1902. Robert R. Haynes, C. Barre Hellquist Common names: Potamot à feuilles raides Endemic

speciesPotamogeton tennesseensis Fernald Rhodora 38: 167, plate 412. 1936. Robert R. Haynes, C. Barre Hellquist Common names: Tennessee pondweed EndemicConservation

speciesPotamogeton oblongus Viviani Annali di Botanica 1(2): 102. 1802. Robert R. Haynes, C. Barre Hellquist Common names: Potamot oblong Introduced Treatment

speciesPotamogeton praelongus Wulfen Arch. Bot. (Leipzig) 3: 331. 1805. Robert R. Haynes, C. Barre Hellquist Common names: White-stemmed pondweed potamot à

G. Smith) Small Flora of the Southeastern United States 45. 1903. Robert R. Haynes, C. Barre Hellquist Common names: Appalachian arrowhead Endemic Basionym:

speciesPotamogeton hillii Morong Botanical Gazette 6: 290, fig. 3. 1881. Robert R. Haynes, C. Barre Hellquist Endemic Synonyms: Potamogeton porteri Fernald Treatment

Kongl. Svenska Vetenskapsakademiens Handlingar n.s. 44:555(5):84. 1916. Robert R. Haynes, C. Barre Hellquist Common names: Yenissei River pondweed potamot de

Manual of Botany of the Northern United States (ed. 5) 485. 1867. Robert R. Haynes, C. Barre Hellquist Common names: Vasey's pondweed potamot de Vasey

speciesPotamogeton gramineus Linnaeus Sp. Pl. 1: 127. 1753 (as gramineum). Robert R. Haynes, C. Barre Hellquist Common names: Potamot à feuilles de graminées Synonyms:

speciesPotamogeton illinoensis Morong Botanical Gazette 5: 50. 1880. Robert R. Haynes, C. Barre Hellquist Common names: Illinois pondweed potamot de I’Illinois

seeds are dispersed by explosive dehiscence of the follicles (M. L. Roberts and R. R. Haynes 1983). This species is cultivated in southeastern United States

It occurs in wetter situations than usual for the species, and (fide R. R. Haynes, pers. comm.) flowers later. This morphology occurs in northwestern Florida

Distribution of the Vascular Flora of Georgia. Athens, Ga. Roberts, M. L. and R. R. Haynes. 1983. Ballistic seed dispersal in Illicium (Illiciaceae). Pl