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13e. Frasera albicaulis Grisebach in W. J. Hooker var. idahoensis (H. St. John) C. L. Hitchcock in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. 4: 60. 1959.
[C E]
Idaho frasera
Swertia idahoensis H. St. John, Amer. Midl. Naturalist 26: 24. 1941; S. albicaulis (Grisebach) D. Douglas ex Kuntze var. idahoensis (H. St. John) J. S. Pringle
Stems glabrous. Leaf blades glabrous. Flowers: calyx glabrous; corolla pale blue, usually without darker spots; corona scales widely ovate to elliptic, 2–6 mm, margins deeply lacerate; rim of differentiated area on corolla surface fringed all around, fringes shorter near distal end.
Flowering early summer. Dry to moist, rocky slopes, open pine woods; of conservation concern; 900–2100 m; Idaho, Oreg.
Variety idahoensis is endemic to the Seven Devils Mountains in Adams County, Idaho, and the Wallowa Mountains in northeastern Oregon.
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