Houstonia nigricans (Lamarck) Fernald var. pulvinata (Small) Fosberg. Florida Dune Diamond-flower. Phen: Jun. Hab: Coastal dunes. Dist: FL peninsula (Flagler and St. Johns counties).
Origin/Endemic status: Endemic
Syn: = Terrell (1986); = Hedyotis nigricans var. pulvinata – K1, Turner (1995b); = Houstonia pulvinata – S; < Stenaria nigricans var. nigricans – Fl5, K3, K4, WH3, Terrell (2001)
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