Flora of the Southeastern United States
2022 Edition

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RUBIACEAE

Houstonia montana Small. Roan Mountain Bluet. Phen: Jun-Jul; Jul-Aug. Hab: In crevices of rock outcrops at the summits of high elevation peaks of the Southern Blue Ridge, also in thin, frost-heaved, gravelly soils of grassy balds near summit outcrops, from 1250-1950 m in elevation. Dist: This species is endemic to the high Blue Ridge of nw. NC, ne. TN, and sw. VA, most notably occurring on Roan Mountain, Grandfather Mountain, Bluff Mountain, and Three Top Mountain. This species was recently found in sw. VA, at Grayson Highlands State Park, Grayson County (G.P. Fleming & K.D. Patterson, pers. comm., 2013).

ID notes: In addition to the characters given above in the key, H. montana also differs from H. purpurea in having larger calyx lobes, corolla, capsules, and seeds.

Origin/Endemic status: Endemic

Syn: = S, W; = Houstonia purpurea var. montana – K1, K3, K4, Tn, Terrell (1959), Terrell (1991), Terrell (1996); < Hedyotis purpurea – Rogers (1987); < Houstonia purpurea – RAB

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image of plant© Gary P. Fleming [image randomly selected]
image of plant© Richard & Teresa Ware [image randomly selected]
image of plant© Alan M. Cressler [image randomly selected]