Symphyotrichum anomalum |
Symphyotrichum potosinum |
|
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manyray aster |
Santa Rita Mountain aster |
|
Habit | Perennials, 20–100(–120) cm, cespitose; usually with short, stout, branched caudices, woody with age, sometimes long-rhizomatous. | Perennials, 15–35(–45) cm, colonial or cespitose; rhizoma-tous. |
Stems | 1–5+, erect or ascending (straight, often stout), proximally usually ± densely hirtellous, sometimes glabrescent, distally hirsute. |
1–3+, ascending to erect (sometimes purple or purplish brown), glabrous or glabrate, sparsely hairy in leaf axils [villous to sericeous]. |
Leaves | thick, firm, margins (slightly undulate) scabrous, adaxial faces glabrous or strigose, scabrous, adaxial ± sparsely hirsute to scabro-hirtellous, sometimes ± scabrous (cauline sometimes with tufts of smaller leaves in axils); basal withering by flowering, petiolate (petioles sometimes narrowly winged), blades oblong-ovate to lanceolate, 10–40 × 10–20 mm, bases deeply cordate, margins sparsely serrate to serrulate, apices usually acute, sometimes obtuse to rounded; proximal cauline usually withering by flowering, petiolate (petioles slender to ± winged), blades ovate to broadly lanceolate, 40–90 × (15–) 25–50 mm, bases shallowly cordate or rounded to attenuate, rarely truncate, margins subentire or entire (rarely serrulate), apices acute or acuminate, with short callus point; distal subpetiolate or sessile, blades ovate to lanceolate or linear-lanceolate, 10–70 × 1–10 mm, gradually or abruptly reduced distally, bases attenuate to cuneate, margins entire, apices acute to acuminate. |
thin, apices callous-pointed, faces glabrous or glabrate; basal usually withering by flowering, long-petiolate, petioles sheathing, sparsely ciliate, blades lanceolate, 40–110 × (3–)5–7 mm, bases attenuate, margins entire to crenulate, rarely with 1–2 teeth, apices obtuse to rounded, callus-pointed; proximalmost cauline sometimes withering by flowering, winged-petiolate or sessile distally, blades lanceolate to linear-lanceolate, 50–120(–180) × 1–6 mm, bases attenuate, margins entire, sparsely ciliate, apices acute; distal sessile, blades subulate to lanceolate, 10–50 × 1–2 mm, bases clasping, apices acuminate. |
Peduncles | densely bracteate, 0.3–5(–10) cm (rarely subsesssile), bracts numerous, linear, 2–6 mm, mucronulate, grading into phyllaries. |
1–4(–6) cm, ascending, glabrate, bracts 1–4(–5), subulate to lanceolate, foliaceous. |
Involucres | campanulate, 5–10 mm. |
cylindric to hemispheric, (4.5–)5–7.3 mm. |
Ray florets | 18–45; corollas usually bright lavender-blue to purple, seldom white, laminae 9–15(–18) × 1–3.2 mm. |
14–27; corollas white, laminae (4.6–)5.6–7(–9.5)–10.3 × 1.3–2 mm. |
Disc florets | 33–40+; corollas cream or light yellow turning pinkish purple, (4–)4.5–5.5 mm, tubes shorter than funnelform throats, lobes sometimes ± spreading, triangular to lanceolate, 0.5–0.8 mm. |
18–35(–42); corollas yellow, 3.5–5 mm, tubes shorter than funnelform throats (hairy), lobes± spreading, triangular, 0.5–0.7 mm. |
Phyllaries | in 4–6 series, oblong-lanceolate (outer) to oblanceolate-linear (innermost), unequal, bases indurate (appressed), margins ciliate to scabro-ciliate, green zones diamond-shaped to lanceolate, ± foliaceous distally, apices reflexed to squarrose, long-acuminate, apiculate, often purple, faces strigoso-hirtellous. |
in 2–3(–5) series, subulate to lanceolate, bases indurate, margins hyaline, entire to erose, often ciliate, green zones linear-lanceolate (outer) or rhombic (inner), apices acute, faces glabrous [sparsely villous]. |
Heads | in open, diffuse, paniculiform arrays, branches divaricate, stout, long, densely bracteate. |
(1–)3–20(–40), in paniculiform arrays, branches patent. |
Cypselae | deep purple to purplish brown or brown with purple speckles (nerves stramineous), oblong-obovoid, compressed, (1–)2.5–3.5(–3.8) mm, 5–6-nerved, faces glabrous; pappi tawny or rose-tinged, 3.7–5.2 mm. |
light brown to gray, narrowly obovoid to fusiform, sometimes ± compressed, 2–3 mm, 5-nerved, faces glabrate to sparsely strigillose; pappi white to cream, 3.5–5.5 mm. |
2n | = 16. |
= 10. |
Symphyotrichum anomalum |
Symphyotrichum potosinum |
|
Phenology | Flowering late Aug–Oct. | Flowering (Jun–)Jul–Sep. |
Habitat | Dry, sandy, loamy, or clayey soils over limestone, or acid soils over chert, sandstone, or granite, rocky, open deciduous woods, thickets, dry ridges, cliffs, bluffs, occasional along streams | Moist, muddy, sandy, or rocky soils along streams |
Elevation | 50–500 m (200–1600 ft) | 1500–1900 m (4900–6200 ft) |
Distribution |
AR; IL; KS; MO; OK
|
AZ; Mexico |
Discussion | A. G. Jones (1989, 1992) reported that Symphyotrichum anomalum may hybridize with S. drummondii, S. oolentangiense, and S. shortii. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Symphyotrichum potosinum is known from Cochise County, Arizona, south into Mexico to northern Oaxaca. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 504. | FNA vol. 20, p. 480. |
Parent taxa | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Symphyotrichum | Asteraceae > tribe Astereae > Symphyotrichum > subg. Astropolium |
Sibling taxa | ||
Synonyms | Aster anomalus | Aster potosinus, Aster lemmonii |
Name authority | (Engelmann ex Torrey & A. Gray) G. L. Nesom: Phytologia 77: 275. (1995) | (A. Gray) G. L. Nesom: Phytologia 77: 289. (1995) |
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