Aster spp.
Family: Asteraceae
Project: Southwest Biodiversity Consortium
Perennials [subshrubs, shrubs], 3-300 cm (rhizomatous, rhizomes long or short, plants sometimes with branched caudices). Stems ascending to erect, simple, ± densely hairy [glabrous], sometimes stipitate-glandular. Leaves basal and/or cauline; sessile or petiolate; blades 1-nerved, spatulate, obovate (mainly basal), oblanceolate, lance-oblong, lanceolate, or linear, distal often reduced, margins entire or serrate [lobed], faces hairy. Heads radiate, borne singly or in corymbiform [paniculiform] arrays. Involucres broadly campanulate or hemispheric [cylindro-campanulate], 15-25 mm diam. Phyllaries persistent, 25-50 in 2-4 series, 1-nerved (flat), ovate to lanceolate, unequal to subequal, bases ± scarious, herbaceous distally or not, green zones along midnerves, margins scarious to hyaline, densely villous, strigillose, or glabrous, sometimes ± short-stipitate-glandular. Receptacles flat or convex, pitted, epaleate. Ray florets 14-55(-100)[-150] in 1 series, pistillate, fertile; corollas white, pink, purple, blue, or violet. Disc florets 20-100+, bisexual, fertile; corollas usually yellow (sometimes reddening), slightly ampliate [tubular], tubes shorter than to equaling funnelform or campanulate throats, lobes 5, usually erect to spreading, rarely reflexed, lanceolate; style-branch appendages lanceolate. Cypselae obconic, compressed, 2 marginal ribs, faces ± densely strigillose [glabrous], sometimes short-stipitate-glandular; pappi persistent, of 20-30 white to tawny, ± equal, barbellate, apically usually attenuate, sometimes ± clavate bristles in 1-2 series. x = 9. Some species of Aster are cultivated and sold in the horticultural trade (J. C. Semple et al. 2002). Some species, notably the type of the genus, Aster amellus Linnaeus, have a large number of cultivars. The genus name is the type of the family name Asteraceae. As circumscribed here, Aster excludes members of the Crinitaria-Galatella-Tripolium complex, which are closer to the Bellidinae ( Bellis, Bellium, Bellidiastrum; O. Fiz et al. 2002). Analysis of molecular data shows that Aster in the strict sense includes Diplactis, Kalimeris, Heteropappus, and a few other eastern Asiatic segregates. The relationship of Aster in the strict sense to other Astereae genera is unclear, and the delimitation of subtribe Asterinae in the sense of G. L. Nesom (1994b) is still uncertain.

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Image of Aster adnatus
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Image of Aster amelloides
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Image of Aster apricus
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Image of Aster bracei
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Image of Aster chinensis
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Image of Aster chlorolepis
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Image of Aster cognatus
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Image of Aster concolor
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Image of Aster conspicuus
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Image of Aster covillei
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Image of Aster dumosus
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Image of Aster elatus
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Image of Aster elliottii
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Image of Aster firmus
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Image of Aster forwoodii
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Image of Aster franklinianus
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Image of Aster fruticosus
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Image of Aster humilis
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Image of Aster infirmus
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Image of Aster juniperinus
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Image of Aster latissimifolius
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Image of Aster laxifolius
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Image of Aster lucidulus
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Image of Aster maackii
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Image of Aster modestus
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Image of Aster novi-belgii
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Image of Aster paludicola
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Image of Aster poaceus
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Image of Aster prenanthoides
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Image of Aster ptarmicoides
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Image of Aster punctatus
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Image of Aster reticulatus
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Image of Aster sandwicensis
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Image of Aster saxatilis
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Image of Aster schreberi
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Image of Aster sedifolius
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Image of Aster smallii
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Image of Aster solidagineus
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Image of Aster sonomensis
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Image of Aster standleyi
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Image of Aster tongolensis
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Image of Aster vernalis
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Image of Aster vialis
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Image of Aster x amethystinus
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Image of Aster x versicolor
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Image of Aster yosemitanus
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Image of Erigeron procumbens
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Image of Tripolium pannonicum
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