Pterocaulon pycnostachyum (Michaux) Elliott. Blackroot, Pineland Wingstem. Phen: Apr-Jun. Hab: Longleaf pine sandhills, pine flatwoods. Dist: Se. NC south to s. FL and west to s. AL.

Origin/Endemic status: Endemic

Synonymy: = Fl7, FNA19, GW2, K1, K3, K4, RAB, SE1, WH3, Arriagada (1998), Cabrera & Ragonese (1978); = Pterocaulon undulatum (Walter) C.Mohr – S; ~ Chaenolobus undulatus (Walter) Small

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