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FNA | Family List | FNA Vol. 20 | Asteraceae | Symphyotrichum

214b. Symphyotrichum Nees subg. Astropolium (Nuttall) Semple in J. C. Semple et al., Cult. Native Asters Ontario. 133. 2002.

Tripolium Nees subg. Astropolium Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 295. 1840; Aster Linnaeus sect. Hesterastrum Bentham; Aster sect. Oxytripolium (de Candolle) Torrey & A. Gray; Conyzanthus Tamamschjan; Symphyotrichum sect. Oxytripolium (de Candolle) G. L. Nesom; Tripolium Nees sect. Oxytripolium de Candolle

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. Heads radiate. Phyllaries unequal (bases indurate), green zones narrowly lanceolate, spatulate to oblanceolate-rhombic, or rhombic (faces glabrous or sparsely hairy). 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. Cypselae narrowly obovoid to fusiform, sometimes ± compressed, 5–6-nerved, sparsely strigillose or glabrate. x = 5.

Species ca. 10 (3 in the flora): North America; introduced worldwide.


Sundberg, S. D. 1986. The Systematics of Aster Subgenus Oxytripolium (Compositae) and Historically Allied Species. Ph.D. dissertation. University of Texas.

Lower Taxa


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