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Thyrsanthella difformis (Walter) Pichon. Climbing Dogbane. Phen: May-Jul; Jul-Sep. Hab: Dry-mesic to mesic upland forests and woodlands, bottomland and riparian forests, moist prairies, flatwoods, swamps, marshes, old fields, roadsides. Dist: 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, K1, K2, Mo2, RAB, S, Tat, Tn, Tx, Va

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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

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image of plant© Bruce A. Sorrie | Original Image ⭷
image of plant© Sonnia Hill | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Sonnia Hill | Original Image ⭷
image of plant© Sonnia Hill | Original Image ⭷

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