UW Burke Herbarium species comparison

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Symphyotrichum tenuifolium

Symphyotrichum hallii

Hall's aster
Habit Fibrous-rooted perennial from a rhizome or branched base, the stems 2-10 dm. tall, pubescent at least above.
Leaves

Lower leaves linear, petiolate, entire, pubescent, early-deciduous; middle and upper leaves linear, sessile, entire, usually pubescent, 2-10 cm. long.
Flowers

Heads few to many in an open inflorescence, with numerous spreading, obtuse bracts 2-4 times as long as wide below the heads;

involucre 4-6 mm. high, the bracts imbricate, papery below and green above, the outer rounded, the inner pointed;

disk flowers numerous, yellow;

ray flowers 15-35, pistillate, white, 5-13 mm. long;

pappus of numerous capillary bristles.
Fruits

Fruit an achene.

Symphyotrichum tenuifolium

Symphyotrichum hallii
Flowering time July-October
Habitat Dry, open places in the valleys and plains.
Distribution
[WildflowerSearch map]
[BONAP county map]
Occurring west of the Cascades crest in Washington; Washington to Oregon.
[WildflowerSearch map]
[BONAP county map]
Origin Native
Conservation status Threatened in Washington (WANHP)
Sibling taxa
S. ×amethystinum, S. ascendens, S. boreale, S. bracteolatum, S. campestre, S. chilense, S. ciliatum, S. ×columbianum, S. ericoides, S. foliaceum, S. frondosum, S. hallii, S. jessicae, S. laeve, S. lanceolatum, S. novae-angliae, S. pilosum, S. spathulatum, S. subspicatum
S. ×amethystinum, S. ascendens, S. boreale, S. bracteolatum, S. campestre, S. chilense, S. ciliatum, S. ×columbianum, S. ericoides, S. foliaceum, S. frondosum, S. jessicae, S. laeve, S. lanceolatum, S. novae-angliae, S. pilosum, S. spathulatum, S. subspicatum
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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