(S. Watson) MacMillan, Metasp. Minnesota Valley. 268. 1892.
(Nuttall) de Candolle var.
S. Watson, Botany (Fortieth Parallel), 24. 1871;
(S. Watson) Greene;
(E. Sheldon) Greene;
(S. Watson) Rydberg;
(E. Sheldon) Rydberg;
M. E. Jones;
(E. Sheldon) Farwell;
Biennials or perennials;
(short-lived, caudex thickened, usually simple, rarely branched).
of leaves 2- or 3-rayed.
erect, unbranched or branched distally, 1.5-7 dm.
blade linear to linear-oblanceolate, 1.5-6(-8) cm × 2-8 mm, base attenuate, margins entire or dentate, apex acute.
(distal) sessile; blade margins entire or denticulate.
elongated or not in fruit.
divaricate-ascending to ascending, stout, slightly narrower than fruit, 4-9(-15) mm.
: sepals oblong to linear-oblong, 4-6 mm, lateral pair slightly saccate basally; petals yellow, oblanceolate, 6-9 (-11) × 1-2 mm, claw 5-7 mm, apex rounded; median filaments 5-7 mm; anthers narrowly oblong to linear, 1-2 mm.
ascending to divaricate-ascending, (not appressed to rachis), narrowly linear, straight, not torulose, 3-5.8(-7) cm × 1-1.5(-1.8) mm, slightly 4-angled or terete, not striped; valves with somewhat prominent midvein, pubescent outside, trichomes 2-4-rayed, glabrous inside; ovules 36-66 per ovary; style cylindrical, stout, 0.7-3 mm, moderately to sparsely pubescent; stigma strongly 2-lobed, lobes as long as wide.
ovoid, 1.2-1.7 × 0.8-1 mm; not winged or wing apiculate.
Flowering Apr-Aug. Calcareous talus and cliffs, roadsides, railroad embankments, abandoned fields, hillsides, alkaline ground, bluffs, crevices and ledges, gravel, prairies, rocky pastures, among brush, waste sites; 100-2700 m; Alta., B.C., Man., N.S., Ont., Que., Sask., Yukon; Alaska, Ark., Colo., Idaho, Ill., Ind., Kans., Maine, Mich., Minn., Mo., Mont., Nev., N.H., N.Y., N.Dak., Ohio, Okla., Oreg., S.Dak., Utah, Wis., Wyo.
is known in Yukon from
Raup & Correll 11255
(A), which was collected 7 miles east of Little Atlin Lake, and
(GH), which was collected from Dawson on 10 August 1916. Most of the other collections from Yukon identified as
. The record from Quebec is based on
(GH), from Cté de Charlevoix, and
Victorin, Germain, & Meilleur 43128
(GH), from Du Lac-Saint-Jean.