Symphyotrichum turbinellum |
Symphyotrichum bracteolatum |
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prairie aster, smooth violet prairie aster, turbinate aster |
bract aster, Eaton's aster, Oregon aster |
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Habit | Perennials, 30–100 cm, cespitose; with thick, branched, woody caudices. | Perennials 40–100 cm, cespitose; short-rhizomatous. |
Stems | 1–5+, erect, straight (stout, brittle), glabrous or sparsely hirtellous in lines. |
1–10+, ascending to erect, glabrous or sparsely puberulent. |
Leaves | (paler green or bluish green abaxially) firm, margins scabrous, apices mucronate, faces glabrous, abaxial raised midribs scabrous to glabrate; basal withering by flowering, subpetiolate to shortly petiolate (petioles winged, sheathing, coarsely ciliate), blades oblanceolate to oblong-oblanceolate, 45–65 × 5–8 mm, bases cuneate, margins shallowly crenate, strigoso-ciliate, apices acute, obtuse or rounded; proximal cauline withering by flowering, subpetiolate or sessile, blades elliptic-lanceolate to linear-oblanceolate or -lanceolate, 40–120 × 5–20 mm, reduced distally, bases cuneate to slightly attenuate or rounded, slightly clasping, margins serrulate-crenate or entire, apices acute to acuminate; distal sessile, blades oblanceolate or elliptic-lanceolate to linear-lanceolate or linear-oblong, (10–)15–100 × 1–5 mm, gradually reduced distally (more strongly so on branches), bases cuneate or rounded, margins entire, apices acuminate. |
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. |
Peduncles | long, thin, (1–)4–10(–25) cm, branches to 10 cm, bracts 8–15, regularly spaced but becoming crowded distally, appressed or ascending, linear-oblong to subulate, 1.5–4 mm, grading into phyllaries, mucronulate. |
sparsely hairy, bracts linear to lanceolate. |
Involucres | turbinate to cylindro-campanulate, 7–12 mm. |
campanulate, 5–8 mm. |
Ray florets | 14–20; corollas light blue to lavender or purple, laminae 12–20 × (1–)1.5–2.8 mm. |
20–40; corollas white to pink, laminae 7–15 × 1–2 mm. |
Disc florets | 15–20+; corollas yellow turning purple, (4.5–)5–7 mm, tubes slightly shorter than narrowly funnelform throats, lobes triangular, 0.5–1 mm. |
35–60+; corollas yellow, 4.5–5 mm, lobes triangular, 0.5–0.75 mm. |
Phyllaries | in 6–9 series, appressed or ± spreading, shortly oblong-lanceolate to subulate (outer) to linear-oblong or linear (inner), strongly unequal, bases indurate 1/2–5/6, abaxially rounded, margins scarious, erose, hyaline, sparsely ciliolate distally, green zones oblanceolate to rhombic-oblanceolate, in distal 1/6–1/2, apices acute (outer) to obtuse or rounded (inner), often callous-mucronulate, faces glabrous. |
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. |
Heads | in open, broad, much ramified, paniculiform arrays, branches ascending to arching, thin, brittle, remotely leafy, rarely sessile. |
in racemiform to narrow, paniculiform arrays, branches usually to 10 cm. |
Cypselae | yellow-tan or light brown to gray, obovoid, ± compressed, (1.8–)2–2.8 mm, 2–4-nerved, faces minutely strigillose; pappi whitish to reddish brown, 4.5–6.4 mm. |
brown, cylindric to obovoid, not compressed, 2.5–3.5 mm, 1–2-nerved, faces hairy; pappi white, 5–6 mm. |
2n | = 96. |
= 16, 32, 48, 64. |
Symphyotrichum turbinellum |
Symphyotrichum bracteolatum |
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Phenology | Flowering Aug–Oct. | Flowering Jul–Aug. |
Habitat | Open, dry, acidic (chert, sandstone, or granite), rocky or loamy soils, woods and glades on upland slopes and ridges in soils associated with or on leached soils above bluffs, pastures, roadsides | Moist to wet sunny places, wet thickets, along streams and ditches |
Elevation | 60–900 m (200–3000 ft) | 500–3100 m (1600–10200 ft) |
Distribution |
AR; IA; IL; KS; LA; MO; NE; OK
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AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC; SK |
Discussion | Symphyotrichum turbinellum is mostly Ozarkian. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 20, p. 530. | FNA vol. 20, p. 531. |
Parent taxa | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Symphyotrichum | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Occidentales |
Sibling taxa | ||
Synonyms | Aster turbinellus | Aster foliaceus var. eatonii, Aster bracteolatus, Aster eatonii |
Name authority | (Lindley) G. L. Nesom: Phytologia 77: 293. (1995) | (Nuttall) G. L. Nesom: Phytologia 77: 276. (1994) |
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