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Houstonia lanceolata (Poiret) Britton. Midwestern Summer Bluet, Lanceleaf Bluet, Glade Mountain Houstonia. Phen: May-Jul; Jul-Aug. Hab: Calcareous prairies and barrens, dry woodlands, banks, rock outcrops, shallow soils around mafic and calcareous rock outcrops. Dist: H. lanceolata ranges from s. ME and w. NY west to s. OH, and sw. MO, south to w. NC, n. GA, AL, MS, AR, and e. OK. The distribution and ecology of H. lanceolata in our area are poorly known; it apparently occupies drier and typically more circumneutral sites than H. purpurea.

Origin/Endemic status: Native

Taxonomy Comments: This taxon is clearly distinct at specific rank from Houstonia purpurea.

Synonymy: = F, Il, S; = Hedyotis purpurea (L.) Torr. & A.Gray var. calycosa (Shuttlew. ex A.Gray) Fosberg; = Houstonia purpurea L. var. calycosa Shuttlew. ex A.Gray – Ar, G, K1, K3, K4, NE, NY, Tn, WV, Terrell (1959), Terrell (1991), Terrell (1996); < Hedyotis purpurea (L.) Torr. & A.Gray – C, Rogers (1987); < Houstonia purpurea L. – Pa, RAB, W

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Heliophily: 7

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