Symphyotrichum chilense |
Symphyotrichum pygmaeum |
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common California aster, common California or Pacific aster, Pacific aster |
pygmy aster |
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Habit | Perennials, 40–100(–120) cm, colonial or cespitose; long-rhizomatous. | Perennials 1.5–15 cm, cespitose; with short, branched caudices, long-rhizomatous (both wiry). |
Stems | 1–5+, ascending or erect, glabrous or hirsute. |
1–10+, decumbent to ascending (purple), sparsely or densely villous to woolly distally. |
Leaves | thin, margins entire, apices usually acute, faces glabrous or sparsely puberulent; basal withering by flowering, petiolate, blades (linear-)oblanceolate to obovate, 30–200 × 4–40 mm, bases attenuate, margins entire to finely serrate, apices acute; proximalmost cauline sometimes withering by flowering, sessile, blades broadly to narrowly oblanceolate, 40–150 × 5–30 mm, bases usually ± attenuate or cuneate; distal sessile, blades lanceolate to oblanceolate, 25–90 × 5–30 mm, bases cuneate. |
firm, margins usually entire, sometimes remotely pauci-serrulate, sparsely villoso-ciliate, apices obtuse to acute, sometimes mucronate; basal often withering by flowering, petiolate (petioles widely winged, sheathing), blades spatulate, 5–19 × 2–4 mm, bases attenuate, apices rounded, faces glabrous or sparsely villous proximally; proximal sessile, blades lanceolate to oblong-lanceolate or (sometimes) -spatulate, 30–50 × 3–10 mm, bases ± clasping, apices obtuse to acute, faces glabrous or sparsely villous; distal sessile, blades lanceolate to oblong, 13–19 × 2–4.5 mm, bases clasping to cuneate, apices acute to obtuse, faces sparsely woolly, sometimes sparsely stipitate-glandular. |
Peduncles | puberulent, bracts 3–10, lanceolate to elliptic, margins often scabrous to ciliolate. |
densely villous to lanate distally, bracts 0. |
Involucres | campanulate, 5–8 mm. |
hemispherico-campanulate, 9–12.5 mm. |
Ray florets | 15–40; corollas violet, laminae 9–15 × 1.5–2.5 mm. |
16–28; corollas purple to violet, laminae 12–18 × 2–3.2 mm. |
Disc florets | 35–60+; corollas yellow, 4–8 mm, lobes triangular, 0.5–1 mm. |
53–55; corollas yellow, 5.6–6.5 mm, throats funnelform, lobes triangular, 0.5–0.8 mm (red or white clavate-hairy). |
Phyllaries | in 3–5 series, oblanceolate or oblong (outer) to linear (inner), unequal to subequal (outer usually shorter than inner, if so, lengths less than 3 times widths), bases scarious (outer) less than 1/2 or sometimes wholly foliaceous, inner scarious, margins eciliate or ciliolate, green zones oblanceolate to obovate or linear (innermost), apices (outer) obtuse, (inner) acute, faces glabrous or puberulent. |
in 3–4 series (dark purple), lance-oblong or oblong (outer) to linear-lanceolate or sometimes linear (inner), subequal, outer ± herbaceous, bases not indurate, margins herbaceous (outer) to narrowly scarious and erose proximally (inner), strongly purple, villoso-ciliate in green portion, green zones (inner) 1/2–2/3 of distal portions, apices acute to acuminate, inner sometimes apiculate, appressed to loose and squarrose (particularly outer), faces woolly to densely villous, sparsely to moderately stipitate-glandular. |
Heads | in open, paniculiform arrays, some branches at least 20+ cm. |
borne singly. |
Cypselae | brown, cylindric to obovoid, not compressed, 3.5–4.5 mm, 2–4-nerved, faces hairy; pappi white to tawny, 4–8 mm. |
fusiform to cylindro-obconic, ± compressed, [size unknown], 4–7-nerved (faint), faces ± densely strigillose; pappi whitish to yellowish, 5–7.2 mm. |
2n | = 48, 64, 96. |
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Symphyotrichum chilense |
Symphyotrichum pygmaeum |
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Phenology | Flowering Jul–Sep. | Flowering summer. |
Habitat | Grasslands, salt marshes, coastal dunes and bluffs, coastal grasslands and scrub, open disturbed habitats in evergreen and Pacific coast coniferous forest | Open, active, moist sand dunes, sandy or silty stream banks and terraces, usually cyclically disturbed gravelly tundra and tundra slopes |
Elevation | 0–500 m (0–1600 ft) | 0–200+ m (0–700+ ft) |
Distribution |
CA; OR; WA; BC
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AK; NT; NU |
Discussion | Symphyotrichum chilense is restricted to coastal habitats from southwestern British Columbia to central California. It is almost entirely coastal in Oregon, Washington, and southern British Columbia, where it is mainly hexaploid (2n = 48). In Oregon, where it is sympatric with S. subspicatum, the latter is mainly duodecaploid (2n = 96). The distinction does not hold in British Columbia, however, where S. subspicatum is both 2n = 48 and 96, and where S. chilense is less common (G. A. Allen 1984). The species was erroneously thought by Nees to occur in Chile. The plants named Aster chilensis var. medius Jepson are hybrids of S. chilense and S. lentum. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Symphyotrichum pygmaeum has long been included within or associated with Eurybia sibirica. Though similar in appearance, the two species can be distinguished by the glands present on S. pygmaeum on the distal leaves and phyllaries. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 536. | FNA vol. 20, p. 485. |
Parent taxa | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Occidentales | Asteraceae > tribe Astereae > Symphyotrichum > subg. Virgulus |
Sibling taxa | ||
Synonyms | Aster chilensis, Aster chilensis var. invenustus | Aster pygmaeus, Aster sibiricus subsp. pygmaeus, Aster sibiricus var. pygmaeus, Eurybia pygmaea |
Name authority | (Nees) G. L. Nesom: Phytologia 77: 277. (1995) | (Lindley) Brouillet & S. Selliah: Sida 21: 1635. (2005) |
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