Symphyotrichum bracteolatum |
Symphyotrichum georgianum |
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bract aster, Eaton's aster, Oregon aster |
Georgia aster |
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Habit | Perennials 40–100 cm, cespitose; short-rhizomatous. | Perennials, 50–100 cm, colonial; rhizomatous, woody. |
Stems | 1–10+, ascending to erect, glabrous or sparsely puberulent. |
1–5+, erect, straight (± stout, light to dark brown), proximally sparsely to moderately short-strigose, distally densely so, stipitate-glandular. |
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. |
(dark green) thick, firm, margins revolute (sometimes ± undulate), scabrous; basal early deciduous, sessile or subpetiolate, blades spatulate to obovate [size unknown], bases cuneate, margins entire to ± serrate, apices acute, faces finely scabrous; proximal cauline withering by flowering, sessile, blades (adaxially obscurely veined) oblong to lanceolate or narrowly obovate to oblanceolate, proximalmost ± pandurate, 20–70 × 10–20 mm, gradually reduced distally, bases auriculate-clasping, margins entire, finely scabrous, faces finely scabrous, stipitate-glandular; distal sessile, blades lanceolate to oblanceolate, 14–50 × 6–11 mm, reduced distally (much smaller on branches and grading ± abruptly into bracts), bases ± auriculate-clasping to subclasping, margins entire, apices mucronate to white-spinulose, faces scabrous, sometimes sparsely to moderately stipitate-glandular. |
Peduncles | sparsely hairy, bracts linear to lanceolate. |
densely short-strigose, ± densely short-stipitate-glandular, bracts 1–8+, spreading to reflexed, linear to narrowly oblong-lanceolate, strigillose, stipitate-glandular, grading into phyllaries. |
Involucres | campanulate, 5–8 mm. |
campanulate to hemispheric, 8–10 mm. |
Ray florets | 20–40; corollas white to pink, laminae 7–15 × 1–2 mm. |
12–24; corollas lavender violet to dark reddish purple, laminae 14–24 × 1.5–3.5 mm. |
Disc florets | 35–60+; corollas yellow, 4.5–5 mm, lobes triangular, 0.5–0.75 mm. |
20–40; corollas white with purplish lobes, 7–9 mm, throats cylindro-funnelform (sparsely pilose), lobes narrowly triangular, 0.7–1.5 mm (sparsely glandular). |
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 4–7 series, spatulate-oblong to lanceolate, unequal, innermost linear-lanceolate, bases tan, ± indurate in proximal 1/3–1/2, margins hyaline, not (outer) to narrowly scarious, strigoso- or hispido-ciliate, sometimes also stipitate-glandular (foliaceous apices), green zones lanceolate-spatulate, covering distal 1/2 or less, foliaceous apically, apices acute (outer) to acuminate or ± caudate (inner), spreading or reflexed (longer, inner), often purplish, faces moderately strigillose, stipitate-glandular. |
Heads | in racemiform to narrow, paniculiform arrays, branches usually to 10 cm. |
in narrow, racemiform to ± broad, paniculiform arrays, sometimes borne singly on branches, branches initially patent then ascending, leafy. |
Cypselae | brown, cylindric to obovoid, not compressed, 2.5–3.5 mm, 1–2-nerved, faces hairy; pappi white, 5–6 mm. |
gray-brown, narrowly obovoid, compressed, 2.5–4 mm, 7–10-nerved, faces sparsely strigose; pappi tan to tawny, 9–11 mm. |
2n | = 16, 32, 48, 64. |
= 50. |
Symphyotrichum bracteolatum |
Symphyotrichum georgianum |
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Phenology | Flowering Jul–Aug. | Flowering Oct–Nov. |
Habitat | Moist to wet sunny places, wet thickets, along streams and ditches | Sandy and clay soils, oak-pine woodlands, road embankments (mostly Piedmont) |
Elevation | 500–3100 m (1600–10200 ft) | 0–300 m (0–1000 ft) |
Distribution |
AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC; SK |
AL; FL; GA; NC; SC |
Discussion | Of conservation concern. Symphyotrichum georgianum is disjunct and rare in southwestern Georgia and Leon County, Florida. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 20, p. 531. | FNA vol. 20, p. 490. |
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 georgianus, Aster patens var. georgianus, Virgulus georgianus, Virgulus patens var. georgianus |
Name authority | (Nuttall) G. L. Nesom: Phytologia 77: 276. (1994) | (Alexander) G. L. Nesom: Phytologia 77: 282. (1995) |
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