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Symphyotrichum hendersonii (Fernald) G.L. Nesom  
Go To Encyclopedia of Life...
Family: Asteraceae
Henderson's American-Aster
Symphyotrichum hendersonii 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, 70-150 cm, colonial; long-rhizomatous. Stems 1-5+, ascending to erect, glabrous or puberulent, especially distally. Leaves thin, margins entire, apices acute, faces glabrous or scabridulous; basal persistent or withering by flowering, petiolate, blades oblanceolate, 50-150 × 10-20 mm, bases attenuate or cuneate; proximal cauline sessile, blades elliptic to oblanceolate, 80-200 × 10-25 mm, bases cuneate, auriculate; distal sessile, 40-80 × 7-20 mm, reduced distally. Heads in paniculiform arrays, branches numerous, 10-45 cm. Peduncles sparsely to densely hairy, bracts 3-10, acute, lanceolate to linear, bases auriculate. Involucres campanulate, 5-10 mm. Phyllaries in 4-5 series, narrowly oblong or linear (outer) to linear (inner), unequal, bases scarious, margins entire, sometimes proximally ciliate, green zones linear, apices acute, faces glabrous. Ray florets 25-45; corollas violet, laminae 9-15 × 1-2.5 mm. Disc florets (50-)70-80; corollas yellow, 5-6 mm, lobes triangular, 0.5-0.8 mm. Cypselae brown, cylindric to obovoid, not compressed, 3-3.5 mm, 3-4-nerved, faces hairy; pappi white, 4.5-5 mm. 2n = 16, 32. Flowering Jul-Aug. Meadows, stream banks, forest openings; 1000-1500+ m; Calif., Idaho, Mont., Oreg., Wash. Symphyotrichum hendersonii is concentrated in north-central Idaho and adjacent Montana and Washington, with possibly outlying populations in the Siskiyou Mountains of southwestern Oregon and adjacent California. It is in some respects intermediate between S. spathulatum and S. cusickii; forms transitional to both of these species occur.

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Symphyotrichum hendersonii
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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)