Stylosanthes biflora (Linnaeus) Britton, Sterns, & Poggenburg. Pencil-flower. Phen: Jun-Aug; Jul-Oct. Hab: Longleaf pine sandhills, dry to moist (but not wet) pine savannas and flatwoods, dry forests, woodlands, woodland borders, glades, barrens, rock outcrops. Dist: S. NY west to OH, s. IL, and KS, south to c. peninsular FL and e. TX.
Origin/Endemic status: Native
Taxonomy Comments: Mohlenbrock (1957) studied variation in this species and did not choose to recognize variation taxonomically (see synonymy); a modern re-evaluation is perhaps warranted.
Synonymy: = Ar, C, FNA11.1, GrPl, Il, K1, K3, K4, NcTx, NY, Pa, RAB, SE3, Tn, Tx, Va, W, WH3, WV, Isely (1998), Mohlenbrock (1957); > Stylosanthes biflora (L.) Britton, Sterns, & Poggenb. var. biflora – F, G, S, S13, Tat; > Stylosanthes biflora (L.) Britton, Sterns, & Poggenb. var. hispidissima (Michx.) Pollard & Ball – F, G, S, S13, Tat; > Stylosanthes riparia Kearney – G, S, S13, Tat; > Stylosanthes riparia Kearney var. riparia – F; > Stylosanthes riparia Kearney var. setifera Fernald – F
Heliophily: 7
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