Symphyotrichum robynsianum |
Symphyotrichum firmum |
|
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aster à longues feuilles, longleaf aster, Robyns' aster |
glossy-leaf aster, shiny-leaf aster |
|
Habit | Perennials, 10–80 cm, colonial; long-rhizomatous. | Perennials, 40–250 cm, colonial; long-rhizomatous. |
Stems | 1, erect (± flexuous, often reddish), glabrous, hairy in lines distally. |
1, erect (straight, ± thin, 2–8 mm diam at base, ± ribbed, red above each node), glabrous or glabrate (very sparsely hispidulous) proximally to ± hispidulous distally. |
Leaves | stiff, margins sparsely serrulate or entire, ± revolute, scabrous, apices acute to acuminate, mucronulate, faces glabrous, sometimes midveins hairy; basal withering by flowering, long-petiolate, petioles narrowly winged, bases sheathing, blades lanceolate, ca. 20 × 3–5 mm, slightly attenuate to narrowly cuneate; proximal cauline withering by flowering, sessile or subpetiolate, blades linear-lanceolate to -oblanceolate, 100–200 × 4–8 mm, bases cuneate to attenuate, clasping; distal sessile, blades linear-lanceolate to linear, 10–110 × 1–7 mm, progressively reduced distally, bases cuneate to rounded, slightly clasping or not, margins entire. |
(crowded, light green, shiny) firm, margins crenulate-serrate or entire, revolute, apices acute to acuminate, mucronate, abaxial faces glabrous or midveins sometimes with hairs apically, adaxial glabrous; basal withering by flowering, subpetiolate (petioles dilated, winged, sheathing), blades spatulate to oblanceolate, 30–100+ × 3–20+ mm, bases attenuate to cuneate, margins remotely crenate-serrate to subentire, apices acute to rounded; proximal cauline withering by flowering, sessile or subpetiolate (petioles widely winged, clasping), blades oblanceolate, 50–150 × 20–30 mm, greatly reduced distally, bases auriculate, clasping, apices acute to acuminate; distal sessile, blades lanceolate to lance-elliptic to oblanceolate, 40–70 × 10–25 mm, little reduced distally, bases auriculate, clasping, margins entire, apices acute to acuminate. |
Peduncles | glabrous or ± densely pilose in lines, bracts 1–4, linear, sometimes inrolled distally, clasping, ciliate, distal 1–2 often subtending and surpassing involucres. |
0.2–3+ cm, glabrous or pilose in lines, bracts 4–6, lanceolate-linear, often subtending heads. |
Involucres | campanulate, 5–8.5 mm. |
campanulate, 6–12 mm. |
Ray florets | 20–35; corollas dark blue-violet, seldom white, laminae 8–13 × 1–1.5 mm. |
20–40; corollas usually blue to pale lavender, sometimes white, laminae 9–18 × 1.0–1.2 mm. |
Disc florets | (18–)23–40; corollas yellow, 4–6.5 mm, tubes shorter than funnelform throats, lobes lanceolate, 0.8–1 mm. |
30–50; corollas yellow or cream becoming pink or purple, (4.5–)5–6.4 mm, tubes shorter than funnelform throats, lobes triangular to lanceolate, 0.6–0.9 mm. |
Phyllaries | in 3–4 series, oblong-lanceolate, subequal, bases indurate 1/3–3/4, margins scarious, erose, hyaline, ciliate proximally, sparsely ciliolate distally, green zones lanceolate to linear, sometimes outer ± foliaceous, apices acuminate to long-acuminate, often foliaceous, mucronate to apiculate, faces glabrous, eglandular. |
in 4–5(–6) series, linear-lanceolate to linear, slightly unequal, bases indurate 1/5–1/2, margins not scarious (outer) to narrowly scarious, erose, hyaline, sparsely ciliolate, green zones linear-lanceolate, outer sometimes ± foliaceous, apices acute to acuminate or long-acuminate to caudate, faces glabrous. |
Heads | in elongate, open, narrow, paniculiform or racemiform arrays, branches ascending, short, leafy, branch leaves smaller and reduced distally (heads 1–3 per branch). |
in densely paniculiform arrays, branches ascending, densely leafy (branch leaves often overtopping heads). |
Cypselae | tan, obovoid, compressed, ca. 2.2–2.4 mm, 5–6-nerved, faces sparsely strigillose; pappi pinkish, 7–8 mm. |
purple or brown, obovoid, oblong or oblanceolate, ± falcate, ± compressed, 1.5–3 mm, 3–4-nerved, faces glabrous or sparsely strigillose; pappi white, 5.2–8 mm. |
2n | = 64, 80. |
= 16. |
Symphyotrichum robynsianum |
Symphyotrichum firmum |
|
Phenology | Flowering Aug–Sep. | Flowering Aug–Oct. |
Habitat | Wet or damp, open, sandy, gravelly, or rocky grounds, often calcareous, cracks in rocky stream or lake shores, limestone alvars, seasonally wet glades and swales, jackpine outwash plains | Open, wet soils, spreading into mesic mineral soils, fens, marshes, wet roadsides |
Elevation | 10–400 m (0–1300 ft) | 100–400 m (300–1300 ft) |
Distribution |
MI; MN; WI; MB; ON; QC
|
GA; IA; MI; MN; MO; NE; AB; MB; ON; SK
|
Discussion | The name Aster longifolius Lamarck has been misapplied to this taxon. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The range of this little known species is badly defined because some specimens attributed to it are in fact white-rayed, glabrate forms of Symphyotrichum puniceum. More work is needed to verify the status of this species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 530. | 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 robynsianus | Aster firmus, Aster lucidulus, Aster puniceus var. firmus |
Name authority | (J. Rousseau) Brouillet & Labrecque: Phytologia 82: 138. (1997) | (Nees) G. L. Nesom: Phytologia 77: 282. (1995) |
Web links |