Collinsonia verticillata Baldwin. Whorled Horsebalm. Phen: Late Apr-early Jun; Jun-Jul. Hab: Rich forests, ranging from moist (cove) forests to rather dry oak forests over mafic or calcareous rocks. Dist: Sc. VA west to e. TN, south to w. NC, nw. SC, c. GA, and MS; disjunct in s. OH. The range is strangely scattered and fragmented.
Origin/Endemic status: Endemic
Synonymy: = C, G, K1, K3, K4, RAB, Tn, Va, W, Peirson, Cantino, & Ballard (2006), Shinners (1962b); = Micheliella verticillata (Baldwin) Briq. – F, S
Heliophily: 3
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