Symphyotrichum foliaceum |
Symphyotrichum laurentianum |
|||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
alpine leafybract aster, Canby's leafybract aster, Cusick's American aster, Cusick's aster, Henderson's aster, Kootenai aster, leafy aster, leafy or leafy-bract or alpine leafybract aster, leafy-bract aster, Parry's aster |
aster du golfe du saint-laurent, Gulf Of St. Lawrence aster |
|||||||||||||
Habit | Perennials 10–60 cm, colonial; long-rhizomatous. | Annuals, 1–13+ cm. | ||||||||||||
Stems | 1–5+, ascending to erect, glabrous or sparsely puberulent. |
1, decumbent to erect (straight), glabrous. |
||||||||||||
Leaves | thin, margins entire or sometimes serrate, apices acute to obtuse, faces usually glabrous, sometimes sparsely hairy; basal usually persistent, petiolate to subpetiolate, blades broadly elliptic to obovate, 30–200 × 8–25(–30) mm, bases attenuate, margins entire or sometimes serrate, apices acute to obtuse; proximal cauline sessile or subpetiolate, blades elliptic to obovate, 35–120 × 8–25 mm, bases attenuate or cuneate to rounded, sometimes ± clasping, apices acute; distal sessile, reduced distally, bases cuneate, apices acute. |
± fleshy, margins entire, eciliate, apices obtuse, faces glabrous; basal deciduous at bolting, petiolate, blades oblanceolate 44–50 × 5–7 mm [cult.], bases attenuate; proximal cauline and some distal withering by flowering; cauline sessile, blades linear-lanceolate to spatulate, 15–55 × 1–4 mm, reduced distally, bases cuneate; distal sessile, blades linear-lanceolate to spatulate. |
||||||||||||
Peduncles | sparsely hairy, bracts 0–3, lanceolate. |
glabrous, bracts linear. |
||||||||||||
Involucres | campanulate, 6–16(–20) mm. |
campanulate, 5–8+mm. |
||||||||||||
Ray florets | 15–60; corollas violet to purple, laminae 8–18(–20) × 1–2 mm. |
0. |
||||||||||||
Pistillate florets | 14–47+ in 2–3+ series; laminae 0 (corolla tubes 2–2.4 mm, shorter than style branches). |
|||||||||||||
Disc florets | 50–150; corollas yellow, 4–7 mm, lobes triangular, 0.4–1 mm. |
5–8+; corollas yellow, 3.1–3.9 mm, lobes deltate to triangular, 0.2–0.3 mm. |
||||||||||||
Phyllaries | in 4–6 series, oblanceolate or oblong (outer) to lanceolate or linear (inner), subequal or unequal (outer exceeding inner), bases outer foliaceous, inner indurate, margins entire, green zones elliptic to lanceolate, apices acute to rounded, faces glabrous or puberulent. |
in 3–4 series, lanceolate, subequal, bases scarious, margins eciliate, green zones foliaceous (outer), apices obtuse, faces glabrous. |
||||||||||||
Heads | borne singly or in paniculiform arrays, branches ascending, up to 25 cm. |
(disciform) in ± densely paniculiform arrays. |
||||||||||||
Cypselae | brown, cylindric to obovoid, not compressed, 2.5–4 mm, 3–4-nerved, faces hairy; pappi white to tawny, 5–8 mm. |
purple, obovoid, ± compressed, 2.8–2.9 mm, 2–4-nerved, faces strigillose; pappi white to yellowish white, 4.8–5.2 mm. |
||||||||||||
2n | = 14. |
|||||||||||||
Symphyotrichum foliaceum |
Symphyotrichum laurentianum |
|||||||||||||
Phenology | Flowering Aug–Sep. | |||||||||||||
Habitat | Brackish sand and mud, intertidal salt marshes, moist dune slacks | |||||||||||||
Elevation | 0 m (0 ft) | |||||||||||||
Distribution |
AK; AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC
|
NB; PE; QC |
||||||||||||
Discussion | Varieties 4 (4 in the flora). Symphyotrichum foliaceum is extremely variable and is widespread in western montane coniferous forests and subalpine meadows. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Symphyotrichum laurentianum is known only from the southern shores of the Gulf of St. Lawrence. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
||||||||||||
Key |
|
|||||||||||||
Source | FNA vol. 20, p. 532. | FNA vol. 20, p. 500. | ||||||||||||
Parent taxa | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Occidentales | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Conyzopsis | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Synonyms | Aster foliaceus | Aster laurentianus, Aster laurentianus var. contiguus, Aster laurentianus var. magdalenensis | ||||||||||||
Name authority | (Lindley ex de Candolle) G. L. Nesom: Phytologia 77: 282. (1995) | (Fernald) G. L. Nesom: Phytologia 77: 286. (1995) | ||||||||||||
Web links |
|