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western mountain aster

Habit Plants perennial, 2–8 dm; from elongate rhizomes.
Stems

ascending to erect, glabrous to sparsely pubescent.

Leaves

? 7 × as long as wide;

margins entire;

tips acute;

surfaces glabrous to sparsely puberulent;

basal leaves present at flowering, narrowly elliptic to obovate, 5–15 cm, petiolate;

cauline linear to narrowly elliptic, 3–6(12) cm, subpetiolate to sessile.

Inflorescences

open; panicle-like arrays, usually few-branched.

Involucres

5–10 mm.

Ray florets

15–40;

rays 9–15 mm, violet.

Phyllaries

in 3–5 unequal series, linear to narrowly oblanceolate, bases scarious-margined;

tips acute, sometimes ± obtuse, green;

surfaces glabrous to sparsely puberulent.

Fruits

pubescent;

pappus bristles 5–7 mm; whitish.

Heads

3–50.

Symphyotrichum spathulatum

Symphyotrichum ontarionis

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

3 varieties.

Source Flora of Oregon, volume 2, page 358
Geraldine Allen
Sibling taxa
S. ascendens, S. bracteolatum, S. campestre, S. chilense, S. ciliatum, S. cusickii, S. cusickii x Symphyotrichum spathulatum, S. ericoides, S. foliaceum, S. frondosum, S. hallii, S. hendersonii, S. laeve, S. lanceolatum, S. novae-angliae, S. subspicatum
S. ascendens, S. bracteolatum, S. campestre, S. chilense, S. ciliatum, S. cusickii, S. cusickii x Symphyotrichum spathulatum, S. ericoides, S. foliaceum, S. frondosum, S. hallii, S. hendersonii, S. laeve, S. lanceolatum, S. novae-angliae, S. spathulatum, S. subspicatum
Subordinate taxa
S. spathulatum var. intermedium, S. spathulatum var. spathulatum, S. spathulatum var. yosemitanum
Synonyms Aster junciformis, Aster occidentalis, Aster spathulatus
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