Flora of North America species comparison

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Thyrsanthella difformis

climbing dogbane
Stems

glabrous or very sparsely pubescent when young.
Leaves

petiole 1–10(–15) mm, glabrous;

blade elliptic to obovate-elliptic or occasionally linear-lanceolate or suborbiculate, 2.7–6(–12) × 0.4–3.5(–7) cm, membranous, base acute to rounded or obtuse, apex acuminate or apiculate, surfaces sparsely pubescent or glabrous.
Peduncles

2.5–5 cm, sparsely pubescent or glabrous.
Pedicels

4–8 mm, minutely pubescent or glabrous.
Flowers

calyx lobes ovate-lanceolate, 3–4 mm, pubescent or glabrous;

corolla glabrous or very sparsely eglandular-pubescent abaxially, eglandular-pubescent adaxially, tube 2.5–3.5 × 1–1.5 mm, throat 2.5–3.5 × 2–3 mm, lobes spreading or reflexed, obliquely obovate, 3–4 × 2–3 mm.
Seeds

8–11 × 1.5–2 mm.
Follicles

10–23 × 0.1–0.3 cm.

Thyrsanthella difformis
Phenology Flowering spring; fruiting spring–fall.
Habitat Bottomlands, swamps, moist upland forests and woodlands.
Elevation 0–400 m. (0–1300 ft.)
Distribution
from FNA
AL; AR; DE; FL; GA; IL; IN; KY; LA; MD; MO; MS; NC; OK; SC; TN; TX; VA
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[BONAP county map]
Discussion

The leaves of Thyrsanthella difformis can exhibit a remarkable variability in width, even on branches of the same plant, most notably in young sprouts of the forest floor.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 14.
Parent taxa Apocynaceae > Thyrsanthella
Synonyms Echites difformis, Forsteronia difformis, Trachelospermum difforme
Name authority (Walter) Pichon: Bull. Mus. Natl. Hist. Nat., sér. 2, 20: 192. (1948)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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