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Asters have purple, pink or white ray florets which are quite wide
Plants are usually tall and leafy with many flower heads per stem
Leaves are alternate, not divided, usually lance-shaped and hairless
Leaves are usually without or with very short stalks
The bracts are usually in 3 or more overlapping rows, green-tipped
Asters usually bloom in late summer and autumn
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Guide to Identify Presented Species of Genus Aster
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FLOWERS WHITE OR VERY LIGHT PINK-BLUE
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A.
ascendens - Long-leaved Aster
Stem 20-100 cm tall, short-hairy at least above. Dry, open places in the valleys.
Flowerheads light blue-white with 15-40 rays, 5-15 mm long. Bracts spreading.
Leaves alternate, mostly entire, mostly short-hairy, narrow, less than 1 cm wide.
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A.
ericoides - Heath Aster
Stems 30-100 cm tall, often clustered. Open, wet or dry places in the valleys.
Flowerheads densely clustered on branches, with
15-25 white rays 3-8 mm long.
Leaves numerous, firm, linear,
spine-tipped, 4-7 cm long and 4-5 mm
wide. |
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A.
falcatus - Cluster Aster
Stem 30-60 cm tall, ascending to erect, branching. Dry, open places, valleys.
Flowerheads white with 20-35 rays, 3-8 mm long, clustered. Bracts spreading.
Leaves alternate, firm, linear or nearly so, often spine-tipped, 5 mm wide or less.
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FLOWERS BLUE OR PURPLE
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A.
conspicuus - Showy Aster
Stems stout, unbranched, 30-100 cm tall. Open woods, foothills to montane.
Flowerheads blue-violet, with 12-35 rays, many in clusters. Involucre glandular.
Leaves alternate, firm, sharp-toothed, elliptic, 6-15 cm
long and 2-6 cm wide. |
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A.
integrifolius - Thick-stemmed Aster
Stems stout, unbranched, 20-70 cm tall. Meadows, open woods, montane zone.
Flowerheads violet-purple, with 10-27 rays 10-15 mm long. Involucre glandular.
Leaves alternate, entire, broadly elliptic, mostly 5-15 cm long, reduced upwards.
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A.
meritus - Arctic Aster
Stems mostly up to 20 cm tall. Open, rocky places, montane to alpine zone.
Flowerheads purple, with 12-23 rays, 8-12 mm long. Bracts paper-textured below.
Leaves alternate, firm, few-small-toothed or entire, 2.5-8 cm long, 4-25 mm wide.
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