Overview

Distribution

National Distribution

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Physical Description

Morphology

Description

Perennials 20–60 cm, colonial; long-rhizomatous. Stems 1–5+, ascending to erect, densely and uniformly strigose, especially distally. Leaves (grayish green) thin to firm, margins entire, apices acute, faces glabrous or strigose; basal usually persistent, petiolate, blades oblanceolate, 50–150 × 5–12(–15) mm, bases attenuate or cuneate, margins entire, apices usually acute; proximal cauline sessile or subpetiolate, blades oblong to narrowly obovate, 50–120 × 5–12 mm, bases attenuate or cuneate; distal sessile, blades 30–70 × 4–10 mm, reduced distally, bases cuneate to ± rounded. Heads in paniculiform arrays, branches ascending. Peduncles moderately to densely strigose, bracts 1–4, linear to oblanceolate. Involucres campanulate, 4–7 mm. Phyllaries in 3–5 series, narrowly oblanceolate or linear (outer) to linear (inner), unequal, bases indurate, margins entire, green zones obovate to elliptic, apices obtuse, faces densely strigose. Ray florets (10–)15–40; corollas violet, laminae 8–13 × 1–1.5 mm. Disc florets 25–65(–80); corollas yellow, sometimes purple-tinged, 4–6 mm, lobes triangular, 0.4–0.8 mm. Cypselae brown, cylindric to obovoid, not compressed, 2–3.5 mm, 3–5-nerved, faces hairy; pappi whitish, 4–7 mm. 2n = 26, 36, 52.
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Diagnostic Description

Synonym

Aster ascendens Lindley in W. J. Hooker, Fl. Bor.-Amer. 2: 8. 1834; A. chilensis Nees subsp. ascendens (Lindley) Cronquist
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Type Information

Isotype for Aster lonchophyllus Greene
Catalog Number: US 412431
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): C. F. Baker
Year Collected: 1901
Locality: Gunnison Watershed, Crested Butte., Colorado, United States, North America
Elevation (m): 2705 to 2705
  • Isotype: Greene, E. L. 1905. Leafl. Bot. Observ. Crit. 1: 146.
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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: N3 - Vulnerable

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Wikipedia

Symphyotrichum ascendens

Symphyotrichum ascendens (formerly Aster ascendens) is a species of aster known by the common names western aster and longleaf aster. It is native to western North America from British Columbia to Saskatchewan, the Sierra Nevada in California, to Arizona and New Mexico. It grows in many types of habitat, including disturbed areas.

Description[edit]

This is a rhizomatous perennial herb growing a branching, erect stem to heights between 20 and 60 centimeters. Leaves are widely lance-shaped to oblong and pointed, the largest ones near the base of the stem reaching up to 15 centimeters long. The stem and leaves are roughly hairy in places.

The inflorescence is an array of many flower heads with many narrow violet to nearly white ray florets around a center of golden disc florets. The fruit is a hairy achene with a long pappus.

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Notes

Comments

Symphyotrichum ascendens is widely distributed in the Great Basin. It is an allopolyploid derived from the hybrid between S. spathulatum (x = 8) and S. falcatum (x = 5). Chromosome numbers differ markedly in their geographic distribution, 2n = 26 prevailing in the southwestern part of the range, and 2n = 52 in the northeastern part (G. A. Allen 1985) Backcrosses to both parental species or hybrids with related taxa are sometimes seen where the ranges overlap.
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