Houstonia tenuifolia Nuttall. Diffuse-branched Bluet. Phen: Apr-Jul; Jul-Oct. Hab: Usually in dry woodlands, often rocky (especially mafic rocks) or sandy. Dist: This species is centered in the Southern Appalachians and the Ozarks, extending into provinces adjacent to both areas of concentration, ranging overall from PA west to MO and OK, south to SC, GA, and TX; disjunct in Panhandle FL.

Origin/Endemic status: Endemic

Synonymy: = F, G, Il, RAB, S, Va, W, WV, Terrell (1959); = Hedyotis nuttalliana Fosberg – C; = Houstonia longifolia Gaertn. – Terrell (1996); = Houstonia longifolia Gaertn. var. tenuifolia (Nutt.) Wood; < Hedyotis longifolia (Gaertn.) Hook. – Rogers (1987); < Houstonia longifolia Gaertn. – Ar, K1, K3, K4, Pa, Tn, WH3

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