RUBIACEAE

Houstonia nigricans (Lamarck) Fernald var. nigricans . Diamond-flower, Glade Bluet, Prairie Bluet. Phen: May-Oct. Hab: Limestone barrens, limestone glades, limestone rocky bluffs, blackland prairies, longleaf pine sandhills, coastal dunes, coastal grasslands, scrubby pine flatwoods. Dist: Sw. VA (Ludwig 1999), s. MI, IA, NE, and e. CO, south to s. FL, TX, e. NM, and along the Sierra Madre Oriental to Hidalgo, Mexico.

Origin/Endemic status: Native

Syn: = Ar, Mo3, Va, Terrell (1986); = Houstonia angustifolia – S; < Hedyotis nigricans – C, GrPl, Il, NcTx, Rogers (1987); > Hedyotis nigricans var. filifolia – Tx, misapplied; < Hedyotis nigricans var. nigricans – K1, Tn, Terrell (1991), Turner (1995b); < Houstonia nigricans – F, G; < Stenaria nigricans – Mi; < Stenaria nigricans var. nigricans – Fl5, K3, WH3, Terrell (2001)

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