(Lindley) G. L. Nesom, Phytologia. 77: 276. 1995.
Long-leaved or intermountain or western aster
Lindley in W. J. Hooker, Fl. Bor.-Amer. 2: 8. 1834;
20—60 cm, colonial; long-rhizomatous.
1—5+, ascending to erect, densely and uniformly strigose, especially distally.
(grayish green) thin to firm, margins entire, apices acute, faces glabrous or strigose; basal usually persistent, petiolate, blades oblanceolate, 50—150 × 5—12(—15) mm, bases attenuate or cuneate, margins entire, apices usually acute; proximal cauline sessile or subpetiolate, blades oblong to narrowly obovate, 50—120 × 5—12 mm, bases attenuate or cuneate; distal sessile, blades 30—70 × 4—10 mm, reduced distally, bases cuneate to ± rounded.
in paniculiform arrays, branches ascending.
moderately to densely strigose, bracts 1—4, linear to oblanceolate.
campanulate, 4—7 mm.
in 3—5 series, narrowly oblanceolate or linear (outer) to linear (inner), unequal, bases indurate, margins entire, green zones obovate to elliptic, apices obtuse, faces densely strigose.
(10—)15—40; corollas violet, laminae 8—13 × 1—1.5 mm.
25—65(—80); corollas yellow, sometimes purple-tinged, 4—6 mm, lobes triangular, 0.4—0.8 mm.
brown, cylindric to obovoid, not compressed, 2—3.5 mm, 3—5-nerved, faces hairy;
whitish, 4—7 mm.
= 26, 36, 52.
Flowering Jul—Aug. Meadows, grasslands, damp areas in sagebrush steppe and Ponderosa pine woodlands; 500—3200 m; Alta., B.C., Sask.; Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., N.Dak., Oreg., Utah, Wash., Wyo.
is widely distributed in the Great Basin. It is an allopolyploid derived from the hybrid between
= 8) and
= 5). Chromosome numbers differ markedly in their geographic distribution, 2
= 26 prevailing in the southwestern part of the range, and 2
= 52 in the northeastern part (G. A. Allen 1985) Backcrosses to both parental species or hybrids with related taxa are sometimes seen where the ranges overlap.