Potentilla supina subsp. paradoxa

(Nuttall) Soják

Folia Geobot. Phytotax. 4: 207. 1969

Common names: Bushy cinquefoil
Illustrated
Basionyms: Potentilla paradoxa Nuttall in J. Torrey and A. Gray, Fl. N. Amer. 1: 437. 1840
Synonyms: P. nicolletii (S. Watson) E. Sheldon P. supina var. nicolletii S. Watson P. supina var. paradoxa (Nuttall) Th. Wolf
Treatment appears in FNA Volume 9. Treatment on page 139.
Stems prostrate to ascending, sometimes erect, (1–)2–4(–6) dm, hairs at base not particularly stiff, not tubercle-based, glands absent or sparse, inconspicuous. Leaves pinnate (with distal leaflets ± confluent), 5–12(–15) cm; petiole 1–6(–8) cm, long hairs sparse to common, ± ascending, sometimes erect or appressed, 0.5–1(–1.5) mm, usually ± weak, crisped hairs absent or sparse to common, glands sparse to common, inconspicuous; leaflets 5–9, on distal (1/4–)1/2–2/3 of leaf axis, ± separate, largest ones oblanceolate to elliptic or obovate, 1–2(–4) × 0.6–1.2(–2.5) cm, distal 2/3 to ± whole margin ± evenly incised 1/4–1/2 to midvein, teeth (2–)4–6 per side, surfaces glabrate or sparsely hairy, glands mostly absent. Inflorescences (10–)20–100+-flowered. Pedicels 0.5–2(–2.5) cm. Flowers: epicalyx bractlets ± elliptic to narrowly ovate, 3–5(–7) × 1–2(–3) mm; hypanthium 3–5 mm diam.; sepals 3–5(–6) mm, apex acute to apiculate; petals yellow, obovate, 2.5–5 × 2–4.5 mm; stamens 20(–25), filaments 0.7–1.8(–2) mm, anthers 0.3–0.5 mm; carpels ca. 100, styles 0.5–0.6 mm. Achenes brown, 0.7–1.3 mm, usually strongly rugose, developing a smooth, corky protuberance on ventral suture, often as large as body of achene. 2n = 28.

Phenology: Flowering late spring–summer.
Habitat: Sandy shorelines of lakes, reservoirs, and streams
Elevation: 200–1600 m

Distribution

V9 200-distribution-map.jpg

Alta., B.C., Man., N.W.T., Ont., Sask., Colo., Idaho, Ill., Iowa, Kans., La., Mich., Minn., Mo., Mont., Nebr., N.Mex., N.Y., N.Dak., Ohio, Okla., Oreg., Pa., S.Dak., Tex., Utah, Wash., Wyo., n Mexico, Eurasia.

Discussion

Although subsp. paradoxa is relatively common and widespread in central North America, occurrences are more sporadic and possibly ephemeral in the far western states. The diagnostic corky protuberance on the achene is well developed only on fully mature achenes, appearing merely as a flap of membranous tissue in earlier stages.

Selected References

None.

Lower Taxa

None.

AuthorBarbara Ertter + and James L. Reveal +
Authority(Nuttall) Soják +
BasionymsPotentilla paradoxa +
Common nameBushy cinquefoil +
DistributionAlta. +, B.C. +, Man. +, N.W.T. +, Ont. +, Sask. +, Colo. +, Idaho +, Ill. +, Iowa +, Kans. +, La. +, Mich. +, Minn. +, Mo. +, Mont. +, Nebr. +, N.Mex. +, N.Y. +, N.Dak. +, Ohio +, Okla. +, Oreg. +, Pa. +, S.Dak. +, Tex. +, Utah +, Wash. +, Wyo. +, n Mexico + and Eurasia. +
Elevation200–1600 m +
HabitatSandy shorelines of lakes, reservoirs, and streams +
IllustrationPresent +
Illustration copyrightFlora of North America Association +
IllustratorMarjorie C. Leggitt +
PhenologyFlowering late spring–summer. +
Publication titleFolia Geobot. Phytotax. +
Publication year1969 +
ReferenceNone +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse grained fna xml/V9/V9 200.xml +
Special statusIllustrated +
SynonymsP. nicolletii +, P. supina var. nicolletii + and P. supina var. paradoxa +
Taxon familyRosaceae +
Taxon namePotentilla supina subsp. paradoxa +
Taxon parentPotentilla supina +
Taxon ranksubspecies +
VolumeVolume 9 +