Symphyotrichum concolor |
Symphyotrichum georgianum |
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eastern silver American-aster, eastern silver aster, eastern silvery aster |
Georgia aster |
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Habit | Perennials, 30–80 cm, cespitose; with cormoid, woody caudices. | Perennials, 50–100 cm, colonial; rhizomatous, woody. | ||||
Stems | 1–10+, ascending to erect (light to dark brown), glabrous or densely canescent distally. |
1–5+, erect, straight (± stout, light to dark brown), proximally sparsely to moderately short-strigose, distally densely so, stipitate-glandular. |
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Leaves | (green to graysih) soft to firm; basal withering by flowering, sessile, blades (1–3-nerved) elliptic-lanceolate, 10–43 × 5–15 mm, bases attenuate, margins usually entire, rarely remotely serrate, piloso-ciliate, apices acute to obtuse, faces silvery silky-pilose to sparsely pilose; proximal cauline withering by flowering, sessile, blades oblanceolate, 20–35 × 5–15 mm, bases rounded, subclasping, margins entire, scabrous to silky-pilose, apices acute to obtuse, cuspidate mucronate, faces ± densely silky; distal sessile, blades usually oblong to lanceolate, rarely ovate, 9–15 × 1.8–5 mm, reduced distally, bases cuneate, margins entire, apices acute, mucronate, faces ± densely silky or sparsely strigose, sometimes glabrate (var. devestitum). |
(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. |
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Peduncles | densely hairy, bracts becoming linear, grading into phyllaries. |
densely short-strigose, ± densely short-stipitate-glandular, bracts 1–8+, spreading to reflexed, linear to narrowly oblong-lanceolate, strigillose, stipitate-glandular, grading into phyllaries. |
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Involucres | campanulate to narrowly campanulate, 5–7 mm. |
campanulate to hemispheric, 8–10 mm. |
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Ray florets | 8–12; corollas rose-purple, rarely white, laminae 4–9 × 1–1.5 mm. |
12–24; corollas lavender violet to dark reddish purple, laminae 14–24 × 1.5–3.5 mm. |
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Disc florets | (9–)11–17(–21); corollas pink turning purple, 4.5–6 mm, tubes shorter than narrowly funnelform throats (thinly puberulent), lobes triangular, 0.4–0.7 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). |
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Phyllaries | in 3–5 series, appressed, lanceolate-oblong, strongly unequal, bases (tan) ± indurate, margins scarious proximally, green distally, green zones restricted to apex, obscured by hair, apices usually acute, sometimes acuminate, usually mucronate, sometimes subspinulose, faces ± densely silky. |
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. |
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Heads | in narrow, paniculiform (virgate) arrays (1–3(–5) per branch). |
in narrow, racemiform to ± broad, paniculiform arrays, sometimes borne singly on branches, branches initially patent then ascending, leafy. |
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Cypselae | obovoid, not compressed, 2.5–3.5 mm, 7–10-nerved, faces densely strigose; pappi tan, (3.5–)4–6 mm. |
gray-brown, narrowly obovoid, compressed, 2.5–4 mm, 7–10-nerved, faces sparsely strigose; pappi tan to tawny, 9–11 mm. |
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2n | = 50. |
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Symphyotrichum concolor |
Symphyotrichum georgianum |
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Phenology | Flowering Oct–Nov. | |||||
Habitat | Sandy and clay soils, oak-pine woodlands, road embankments (mostly Piedmont) | |||||
Elevation | 0–300 m (0–1000 ft) | |||||
Distribution |
AL; DE; FL; GA; KY; LA; MA; MD; MS; NC; NJ; NY; RI; SC; TN; VA
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AL; FL; GA; NC; SC |
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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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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Key |
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Source | FNA vol. 20, p. 492. | FNA vol. 20, p. 490. | ||||
Parent taxa | Asteraceae > tribe Astereae > Symphyotrichum > subg. Virgulus | Asteraceae > tribe Astereae > Symphyotrichum > subg. Virgulus | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Aster concolor, Lasallea concolor, Virgulus concolor | Aster georgianus, Aster patens var. georgianus, Virgulus georgianus, Virgulus patens var. georgianus | ||||
Name authority | (Linnaeus) G. L. Nesom: Phytologia 77: 278. (1995) | (Alexander) G. L. Nesom: Phytologia 77: 282. (1995) | ||||
Web links |