Symphyotrichum anomalum |
Symphyotrichum rhiannon |
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manyray aster |
Rhiannon aster, Rhiannon's aster |
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Habit | Perennials, 20–100(–120) cm, cespitose; usually with short, stout, branched caudices, woody with age, sometimes long-rhizomatous. | Perennials, 15–40(–60) cm, colonial; thinly long-rhizomatous. |
Stems | 1–5+, erect or ascending (straight, often stout), proximally usually ± densely hirtellous, sometimes glabrescent, distally hirsute. |
1, erect (straight), hirsute to hispido-hirsute, hirsutulous distally. |
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. |
margins shallowly crenate to serrate-crenate, abaxial faces strigillose, adaxial scabrous; basal withering by flowering, petiolate, petioles winged, clasping to subclasping, shallowly auriculate, blades subspatulate or oblanceolate-elliptic, 30–70 × 10–15 mm, bases attenuate to cuneate, apices acute; proximal cauline withering by flowering, widely winged-petiolate, blades oblanceolate-elliptic, 50–110 × 8–22 mm, bases attenuate, apices acute; distal subsessile, blades oblong-lanceolate, 10–30 × 4–6(–8) mm. |
Peduncles | densely bracteate, 0.3–5(–10) cm (rarely subsesssile), bracts numerous, linear, 2–6 mm, mucronulate, grading into phyllaries. |
0.5–1.5(–3) cm, bracts foliaceous. |
Involucres | campanulate, 5–10 mm. |
turbino-campanulate, 6–11 wide mm. |
Ray florets | 18–45; corollas usually bright lavender-blue to purple, seldom white, laminae 9–15(–18) × 1–3.2 mm. |
18–32; corollas blue to lavender, laminae 6–9 × 0.8–1.4 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. |
[number unknown]; corollas yellow, at least lobes becoming purple, (4–)4.5–5.5 mm, tubes shorter than cylindro-funnelform limbs, lobes triangular, 0.8–1 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 3–4 series, slightly unequal, narrowly oblong-lanceolate, bases indurate 1/2–2/3, margins not scarious, irregularly ciliolate, green zones rhombic-lanceolate, apices acute to acuminate, faces glabrous or distally strigoso-puberulent. |
Heads | in open, diffuse, paniculiform arrays, branches divaricate, stout, long, densely bracteate. |
in broad, cylindro-paniculiform arrays, branches ascending. |
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. |
tan to often purplish, oblong to oblanceoloid, ± compressed, 2.6–3 mm, 4–6-nerved, faces sparsely strigillose; pappi white, [length unknown] mm. |
2n | = 16. |
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Symphyotrichum anomalum |
Symphyotrichum rhiannon |
|
Phenology | Flowering late Aug–Oct. | Flowering Sep–Oct(–Nov). |
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 | Ultramafic outcrop barrens, in Quercus alba-Pinus rigida-Sporobolus heterolepis-Andropogon gerardii woodlands and grass-dominated areas |
Elevation | 50–500 m (200–1600 ft) | 900–1300 m (3000–4300 ft) |
Distribution |
AR; IL; KS; MO; OK
|
NC |
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 rhiannon is known only from a southern Appalachian high-elevation outcrop barren around Buck Creek, southern Nantahala Mountains, Clay County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 504. | FNA vol. 20, p. 526. |
Parent taxa | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Symphyotrichum | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Symphyotrichum |
Sibling taxa | ||
Synonyms | Aster anomalus | |
Name authority | (Engelmann ex Torrey & A. Gray) G. L. Nesom: Phytologia 77: 275. (1995) | Weakley & Govus: Sida 21: 828, fig. 1. (2004) |
Web links |