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Houstonia canadensis Willdenow ex Roemer & J.A. Schultes. Canada Bluet. Phen: Apr-Aug. Hab: Dry limestone barrens (sometimes locally abundant in shallow soils over limestone), limestone woodlands and outcrops. Dist: ME and s. ON west to MI and n. IL, south to sw. VA, se. and c. TN, nw. GA, w. TN, and se. MO (J. Thomas, pers. comm., 2016).

Origin/Endemic status: Native

Taxonomy Comments: Terrell (1959) determined that Houstonia setiscaphia (allegedly a narrow endemic of sw. VA) fell within the range of variation of southern populations of H. canadensis. Further study is perhaps warranted.

Synonymy: = G, Il, K1, K3, K4, Mi, NY, Pa, Tn, Va, W, WV, Terrell (1959), Terrell (1991), Terrell (1996); = Hedyotis canadensis (Willd. ex Roem. & Schult.) Fosberg – C, Rogers (1987); = n/a – RAB; > Houstonia canadensis Willd. ex Roem. & Schult. – F; > Houstonia canadensis Willd. ex Roem. & Schult. var. setiscaphia (L.G.Carr) C.F.Reed; > Houstonia setiscaphia L.G.Carr – F

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Heliophily: 8

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image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷

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