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Symphyotrichum hallii (A. Gray) G.L. Nesom  
Go To Encyclopedia of Life...
Family: Asteraceae
Hall's American-Aster
Symphyotrichum hallii image
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Luc Brouillet, John C. Semple, Geraldine A. Allen, Kenton L. Chambers, Scott D. Sundberg+ in Flora of North America (vol. 20)
Perennials, 30-60 cm, colonial; long-rhizomatous. Stems 1-6, ascending to erect, glabrous or puberulent, especially distally. Leaves thin, margins entire, apices acute, faces glabrous or scabridulous; basal withering by flowering, petiolate, blades narrowly oblanceolate to linear, 10-60 × 2-10 mm, attenuate, margins entire; proximalmost cauline sometimes withering by flowering, sessile, blades linear to narrowly oblanceolate, 30-80 × 2-8 mm, bases cuneate, apices acute; distal sessile, blades linear, 10-50 × 2-8 mm, bases ± cuneate, truncate. Heads in racemiforn to paniculiform arrays, branches usually less than 10(-20) cm. Peduncles sparsely to densely hairy, bracts 3-10, linear to narrowly elliptic, much smaller than distal leaves. Involucres campanulate, 4-7 mm. Phyllaries in 5-6 series, appressed, narrowly oblanceolate (outer) to linear (inner), unequal, bases (outer) herbaceous or scarious less than 1 / 2 , margins entire, green zones ovate to linear (inner), apices obtuse, faces glabrous. Ray florets 14-35; corollas usually white, sometimes pale violet, laminae 7-12 × 1-2 mm. Disc florets 20-35; corollas yellow, 4.5-6.5 mm, lobes triangular, 0.7-1 mm, glabrous. Cypselae brown, cylindric to obovoid, not compressed, 2-2.5 mm, 2-5-nerved, faces hairy; pappi white, 5-7 mm. 2n = 16, 32, 48. Flowering Jul-Aug. Summer-dry grasslands and meadows; 0-500 m; Oreg., Wash. Symphyotrichum hallii is restricted to open habitats of the Puget Trough of western Washington and the Willamette Valley of western Oregon, with outlying stations in the Columbia Gorge and central Washington. Some of the polyploid races appear to be alloploids involving the sympatric S. subspicatum, with larger leaves and fewer, larger heads with violet rays.

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Symphyotrichum hallii
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The National Science Foundation
Developments of SEINet, Symbiota, and associated specimen databases have been supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)