Triadenum walteri

(J. F. Gmelin) Gleason

Phytologia 2: 289. 1947

EndemicSelected by author to be illustrated
Basionyms: Hypericum walteri J. F. Gmelin Syst. Nat. 2: 1159. 1792 (as Hypericon)
Synonyms: Elodes floribunda Spach E. petiolata Pursh Gardenia petiolata (Pursh) Farwell Hypericum paludosum Choisy H. tubulosum var. walteri (J. F. Gmelin) Lott Triadenum petiolatum unknown
Treatment appears in FNA Volume 6. Treatment on page 105. Mentioned on page 103.
Herbs erect, to 10 dm, sometimes with ascending branches in distal 1/2+. Stems: internodes 4-lined at first, then terete. Leaves petiolate, petiole 2–15 mm; blade narrowly elliptic to narrowly oblong, 30–150 × 10–35 mm, base cuneate, apex rounded, gland dots laminar and intramarginal. Inflorescences interrupted spiciform-cylindric, 3-flowered from terminal node, sometimes with subsessile flowers or pedunculate triads and/or flowering branches from to 8 proximal nodes. Flowers 7–10 mm diam.; sepals narrowly oblong to narrowly elliptic or lanceolate, 3–5 × 1–1.5 mm, apex obtuse to rounded; petals narrowly obovate, 5–7 mm; stamen fascicles 3–5 mm; filaments 1/2+ connate; styles 0.8–1.2 mm. Capsules cylindric, 7–12 × 3–4 mm, apex subacute. Seeds 0.8–1.1 mm.

Phenology: Flowering late summer (Jul–Sep).
Habitat: Swampy or marshy ground in woods, pond or lake margins, on fallen logs
Elevation: 0–400 m


V6 185-distribution-map.jpg

Ala., Ark., Del., Fla., Ga., Ill., Ind., Ky., La., Md., Miss., Mo., N.J., N.C., Ohio, Okla., S.C., Tenn., Tex., Va., W.Va.


The petiolate leaves usually distinguish Triadenum walteri from the other three North American species of Triadenum (see note under T. tubulosum.



Lower Taxa

No lower taxa listed.

Facts about "Triadenum walteri"
AuthorNorman K. B. Robson +
Authority(J. F. Gmelin) Gleason +
BasionymsHypericum walteri +
DistributionAla. +, Ark. +, Del. +, Fla. +, Ga. +, Ill. +, Ind. +, Ky. +, La. +, Md. +, Miss. +, Mo. +, N.J. +, N.C. +, Ohio +, Okla. +, S.C. +, Tenn. +, Tex. +, Va. + and W.Va. +
Elevation0–400 m +
HabitatSwampy or marshy ground in woods, pond or lake margins, on fallen logs +
IllustratorYevonn Wilson-Ramsey +
PhenologyFlowering late summer (Jul–Sep). +
Publication titlePhytologia +
Publication year1947 +
ReferenceNone +
Source xml grained fna xml/V6/V6 185.xml +
Special statusEndemic + and Selected by author to be illustrated +
SynonymsElodes floribunda +, E. petiolata +, Gardenia petiolata +, Hypericum paludosum +, H. tubulosum var. walteri + and Triadenum petiolatum +
Taxon familyHypericaceae +
Taxon nameTriadenum walteri +
Taxon parentTriadenum +
Taxon rankspecies +
VolumeVolume 6 +