Flora of North America species comparison

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Symphyotrichum subg. Astropolium
Habit Annuals or perennials eglandular; taprooted or rhizomatous.
Stems

not brittle at maturity, glabrous or glabrate, sometimes sparsely hairy in leaf axils.
Leaves

basal withering by flowering, petiolate, blades 1-nerved, spatulate to ovate or obovate, margins entire or shallowly serrate or crenate;

cauline subpetiolate or sessile, blades narrowly lanceolate, linear, or subulate, bases attenuate, slightly sheathing, or ± clasping.
Ray florets

10–30(–54) in 1 series;

laminae (1.3–)5–8.5(–9.5) × (0.2–)1.2–2 mm.
Disc corollas

sometimes weakly ampliate, throats funnelform, lobes ± erect or ± spreading.
Phyllaries

unequal (bases indurate), green zones narrowly lanceolate, spatulate to oblanceolate-rhombic, or rhombic (faces glabrous or sparsely hairy).
Heads

radiate.
Cypselae

narrowly obovoid to fusiform, sometimes ± compressed, 5–6-nerved, sparsely strigillose or glabrate.
x

= 5.

Symphyotrichum subg. Astropolium
Distribution
North America [Introduced worldwide]
Discussion

Species ca. 10 (3 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 479.
Parent taxa Asteraceae > tribe Astereae > Symphyotrichum
Subordinate taxa
Synonyms Tripolium subg. Astropolium, Aster section Hesterastrum, Aster section Oxytripolium, subg. Conyzanthus, S. section Oxytripolium, Tripolium section Oxytripolium
Name authority (Nuttall) Semple: in J. C. Semple et al., Cult. Native Asters Ontario, 133. (2002)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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