Symphyotrichum bracteolatum |
Symphyotrichum walteri |
|
---|---|---|
bract aster, Eaton's aster, Oregon aster |
Walter's aster |
|
Habit | Perennials 40–100 cm, cespitose; short-rhizomatous. | Perennials, 20–100 cm, colonial or cespitose, eglandular, sometimes sparsely, minutely stipitate-glandular; long-rhizomatous, with erect, thick, ± cormoid, woody caudices. |
Stems | 1–10+, ascending to erect, glabrous or sparsely puberulent. |
1–5+, erect to scandent-sprawling (mid to dark brown, branched from middle), glabrous or very sparsely fine strigose. |
Leaves | thin, margins entire or sometimes serrate, apices acute; basal withering by flowering, petiolate, blades narrowly lanceolate, 60–200 × 10–20 mm, attenuate or cuneate, margins usually entire, sometimes serrate, apices acute, faces glabrous or sparsely puberulent; proximalmost cauline sometimes withering by flowering, sessile, blades narrowly lanceolate, 50–150 × 8–25 mm, bases cuneate, often auriculate, apices acute; distal sessile, blades linear to narrowly lanceolate, 20–120 × 3–20 mm, bases cuneate, often auriculate, apices acute. |
(bright green) thick, firm, ± succulent, margins entire; basal early deciduous, sessile, blades (3-nerved) oblanceolate to obovate, 10–43 × 7–15 mm, bases cuneate, margins scabrous, apices obtuse, mucronate, faces sparsely finely scabrous; proximal cauline sessile (patent to reflexed), blades ovate to lanceolate, 8–30 × 2–10 mm, bases cordate-clasping, apices acute, sometimes spinulose, faces finely scabrous, shiny; distal sessile, blades lanceolate to triangular, 5–15 × 2.5–3.5 mm, reduced to bracts distally, bases clasping, margins finely scabrous, apices acute, white-spinulose, faces finely scabrous. |
Peduncles | sparsely hairy, bracts linear to lanceolate. |
glabrous, bracts relatively numerous, tiny, foliaceous, becoming minute, linear, glabrous. |
Involucres | campanulate, 5–8 mm. |
campanulate, 5–7 mm. |
Ray florets | 20–40; corollas white to pink, laminae 7–15 × 1–2 mm. |
11–26; corollas bluish purple, laminae 5–9(–11) × 0.5–1 mm. |
Disc florets | 35–60+; corollas yellow, 4.5–5 mm, lobes triangular, 0.5–0.75 mm. |
(6–)15–25(–30); corollas yellow, 4–6.5 mm, throats narrowly funnelform, lobes triangular, 0.4–0.8 mm. |
Phyllaries | in 3–5 series, often spreading, oblanceolate (outer) to linear (inner), subequal, outer indurate less than 1/2, bases outer variable, inner scarious, margins entire, scabrous to ciliolate, green zones oblanceolate to elliptic, apices acute to obtuse, often spreading, faces glabrous or sparsely puberulent. |
in 4–5 series, oblanceolate, strongly unequal, bases (tan) ± indurate, margins hyaline, finely scabrous, green zones diamond-shaped, in distal 1/4–1/2, apices obtuse, mucronate to finely subspinulose, innermost acuminate, faces sparsely strigillose (often obscured by thick, shiny cuticle). |
Heads | in racemiform to narrow, paniculiform arrays, branches usually to 10 cm. |
borne singly in diffusely paniculiform arrays, branches initially patent to divaricate, elongate. |
Cypselae | brown, cylindric to obovoid, not compressed, 2.5–3.5 mm, 1–2-nerved, faces hairy; pappi white, 5–6 mm. |
tan to brown, obovoid, not compressed, 2–2.5 mm, nerves very faint, faces sparsely to moderately strigose; pappi tan, 4–6 mm. |
2n | = 16, 32, 48, 64. |
= 20. |
Symphyotrichum bracteolatum |
Symphyotrichum walteri |
|
Phenology | Flowering Jul–Aug. | Flowering Oct–Dec. |
Habitat | Moist to wet sunny places, wet thickets, along streams and ditches | Sandy, clayey soils, margins of woods, open oak-pine scrub, pine flatwoods, fields, roadsides |
Elevation | 500–3100 m (1600–10200 ft) | 0–100+ m (0–300+ ft) |
Distribution |
AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC; SK |
FL; GA; NC; SC
|
Source | FNA vol. 20, p. 531. | FNA vol. 20, p. 492. |
Parent taxa | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Occidentales | Asteraceae > tribe Astereae > Symphyotrichum > subg. Virgulus |
Sibling taxa | ||
Synonyms | Aster foliaceus var. eatonii, Aster bracteolatus, Aster eatonii | Aster walteri, Lasallea walteri, Virgulus walteri |
Name authority | (Nuttall) G. L. Nesom: Phytologia 77: 276. (1994) | (Alexander) G. L. Nesom: Phytologia 77: 294. (1995) |
Web links |
|