Symphyotrichum frondosum |
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alkali aster, leafy annual American-aster, short-ray alkali aster, short-ray aster |
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Habit | Annuals or sometimes perennials, 5–140 cm. |
Stems | 1–6+, decumbent to erect (straight), glabrous. |
Leaves | thin, margins entire (basal sometimes serrulate), sometimes ciliate or remotely scabrous, acute to ± obtuse, faces glabrous; basal withering by flowering, petiolate, blades oblanceolate to spatulate, 20–115 × 2–15 mm [cult.], bases attenuate; proximal cauline withering by flowering; cauline subpetiolate or sessile (distal), blades oblanceolate to linear, 10–80 × 1.5–10 mm, reduced distally, bases cuneate. |
Peduncles | glabrous, bracts linear. |
Involucres | narrowly campanulate, 5–9 mm. |
Ray florets | 90–110 in 4–5+ series; corollas pink to pinkish white, laminae 1.5–2 × 0.1–0.2 mm (surpassing style branches, barely surpassing disc corollas; tubes ± 3 mm). |
Disc florets | ± 37; corollas yellow, 4.4–5.2 mm, barely ampliate, tubes much longer than cylindric limbs, lobes lanceolate, ± 0.3 mm. |
Phyllaries | in 3–4 series, ± spreading, oblong-oblanceolate or -lanceolate to obovate, subequal to ± unequal, linear-lanceolate or linear (innermost), bases scarious, margins narrowly scarious, hyaline, erose, ciliolate, green zones (outer) foliaceous, (inner) lanceolate, apices obtuse to rounded, inner acute, mucronulate, faces glabrous. |
Heads | (radiate) in narrow, paniculiform to spiciform arrays, branches often in axils of nearly every leaf, ascending. |
Cypselae | tan, obovoid, ± compressed, 2 mm, 2–3-nerved, faces strigillose; pappi white to yellowish, 6.3–7.5 mm. |
2n | = 14. |
Symphyotrichum frondosum |
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Phenology | Flowering Aug–Oct. |
Habitat | Moist, usually saline soils, summer-receding shores of lakes or ponds, vernally moist, alkaline bottoms, marshes, often in steppes |
Elevation | 10–2200 m (0–7200 ft) |
Distribution |
AZ; CA; CO; ID; NM; NV; OR; UT; WA; WY; BC; Mexico (Baja California)
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Source | FNA vol. 20, p. 499. |
Parent taxa | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Conyzopsis |
Sibling taxa | |
Synonyms | Tripolium frondosum, Aster frondosus, Brachyactis frondosa |
Name authority | (Nuttall) G. L. Nesom: Phytologia 77: 282. (1995) |
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