Thyrsanthella difformis (Walter) Pichon. Common name: Climbing Dogbane. Phenology: May-Jul; Jul-Sep. Habitat: Dry-mesic to mesic upland forests and woodlands, bottomland and riparian forests, moist prairie, flatwoods, swamps, marsh, old fields, roadsides. Distribution: DE south to n. peninsular FL, west to e. TX, north in the interior to MO and IN.

ID notes: Very variable in leaf size, with leaves up to 14 cm long and 8 cm wide, but usually much smaller and proportionally narrow than that. The leaves are often about the size and shape of Gelsemium leaves; fresh material is easily distinguished by the milky sap of Thyrsanthella.

Origin/Endemic status: Endemic

Taxonomy Comments: See Krings (2003) for a discussion of nomenclature.

Synonymy ⓘ: = Fl5, FNA14, K4, Ok, WH3, Livshultz et al (2007); = Echites difformis Walter = Forsteronia difformis (Walter) DC.; = Trachelospermum difforme (Walter) A.Gray — Ar, C, F, G, GW2, Il, Mo2, RAB, S, Tat, Tn, Tx, Va. Basionym: Echites difformis Walter 1788

Links to other floras: = Thyrsanthella difformis - FNA14

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FACW
• Eastern Mountains and Piedmont: FACW
• Great Plains: FACW
• Midwest: FACW

Heliophily ⓘ: 5