Symphyotrichum pygmaeum

(Lindley) Brouillet & S. Selliah

Sida 21: 1635. 2005.

Common names: Pygmy aster
EndemicConservation concern
Basionym: Aster pygmaeus Lindley in W. J. Hooker, Fl. Bor.-Amer. 2: 6. 1834
Synonyms: Aster sibiricus subsp. pygmaeus (Lindley) Á. Löve & D. Löve Aster sibiricus var. pygmaeus (Lindley) Cody Eurybia pygmaea
Treatment appears in FNA Volume 20. Treatment on page 485. Mentioned on page 470, 483.

Perennials 1.5–15 cm, cespitose; with short, branched caudices, long-rhizomatous (both wiry). Stems 1–10+, decumbent to ascending (purple), sparsely or densely villous to woolly distally. Leaves firm, margins usually entire, sometimes remotely pauci-serrulate, sparsely villoso-ciliate, apices obtuse to acute, sometimes mucronate; basal often withering by flowering, petiolate (petioles widely winged, sheathing), blades spatulate, 5–19 × 2–4 mm, bases attenuate, apices rounded, faces glabrous or sparsely villous proximally; proximal sessile, blades lanceolate to oblong-lanceolate or (sometimes) spatulate, 30–50 × 3–10 mm, bases ± clasping, apices obtuse to acute, faces glabrous or sparsely villous; distal sessile, blades lanceolate to oblong, 13–19 × 2–4.5 mm, bases clasping to cuneate, apices acute to obtuse, faces sparsely woolly, sometimes sparsely stipitate-glandular. Heads borne singly. Peduncles densely villous to lanate distally, bracts 0. Involucres hemispherico-campanulate, 9–12.5 mm. Phyllaries in 3–4 series (dark purple), lance-oblong or oblong (outer) to linear-lanceolate or sometimes linear (inner), subequal, outer ± herbaceous, bases not indurate, margins herbaceous (outer) to narrowly scarious and erose proximally (inner), strongly purple, villoso-ciliate in green portion, green zones (inner) 1/2–2/3 of distal portions, apices acute to acuminate, inner sometimes apiculate, appressed to loose and squarrose (particularly outer), faces woolly to densely villous, sparsely to moderately stipitate-glandular. Ray-florets 16–28; corollas purple to violet, laminae 12–18 × 2–3.2 mm. Disc-florets 53–55; corollas yellow, 5.6–6.5 mm, throats funnelform, lobes triangular, 0.5–0.8 mm (red or white clavate-hairy). Cypselae fusiform to cylindro-obconic, ± compressed, [size unknown], 4–7-nerved (faint), faces ± densely strigillose; pappi whitish to yellowish, 5–7.2 mm.


Phenology: Flowering summer.
Habitat: Open, active, moist sand dunes, sandy or silty stream banks and terraces, usually cyclically disturbed gravelly tundra and tundra slopes
Elevation: 0–200+ m

Discussion

Of conservation concern.

Symphyotrichum pygmaeum has long been included within or associated with Eurybia sibirica. Though similar in appearance, the two species can be distinguished by the glands present on S. pygmaeum on the distal leaves and phyllaries.

Selected References

None.

Lower Taxa

None.
... more about "Symphyotrichum pygmaeum"
not tailed +, rounded +  and obtuse +
distinct +
0.5 cm5 mm <br />0.005 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
villous +  and glabrous +
subequal +
scarious +
2mm +  and 4mm +
usually triangular +  and linear +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
(Lindley) Brouillet & S. Selliah +
0.5 cm5 mm <br />0.005 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
villous +  and glabrous +
cuneate +, rounded +, attenuate +  and spatulate +
not indurate +
2mm;4mm +
Aster pygmaeus +
1.3 cm13 mm <br />0.013 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
villous +  and glabrous +
lanceolate;oblong +
2mm;4.5mm +
rugulose +  and muricate +
barbellulate +  and barbellate +
long-rhizomatous +  and branched +
Pygmy aster +
not 2-lipped +  and actinomorphic +
yellow +, purple +  and violet +
at maturity , more or less ampliate , tubes usually shorter +
0.56 cm5.6 mm <br />0.0056 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
compressed +, fusiform +  and cylindro-obconic +
fertile +  and bisexual +
fertile +  and bisexual +
N.W.T. +, Nunavut +  and Alaska. +
0–200+ m +
0.5 cm5 mm <br />0.005 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
strigillose +, villous +  and sparsely moderately stipitate-glandular +
rounded;attenuate;spatulate +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Open, active, moist sand dunes, sandy or silty stream banks and terraces, usually cyclically disturbed gravelly tundra and tundra slopes +
disciform +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
hemispherico-campanulate +
0.9 cm9 mm <br />0.009 m <br /> (1.25 cm12.5 mm <br />0.0125 m <br />) +
2.4 cm24 mm <br />0.024 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
12mm;18mm +
2mm;3.2mm +
sessile +  and petiolate +
cauline +  and basal +
decurrent +
triangular +
pauci-serrulate +  and entire +
not +  and hyaline +
ciliate +  and scabrous +
entire +, crenate +  and serrate +
2-carpellate +
whitish +  and yellowish +
persistent +
25 +  and 40 +
0.5 cm5 mm <br />0.005 m <br /> (0.72 cm7.2 mm <br />0.0072 m <br />) +
densely villous +  and lanate +
Flowering summer. +
oblong +  and linear-lanceolate +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
Endemic +  and Conservation concern +
branched +  and simple +
decumbent +  and ascending +
1 +  and 10 +
appendaged +  and truncate +
papillate +  and smooth +
Aster sibiricus subsp. pygmaeus +, Aster sibiricus var. pygmaeus +  and Eurybia pygmaea +
Symphyotrichum pygmaeum +
Symphyotrichum subg. Virgulus +
species +
at maturity , more or less ampliate , tubes usually shorter +
ampliate +
with cormoid caudices +  and rhizomatous +
stipitate-glandular +
1.5 cm15 mm <br />0.015 m <br /> (15 cm150 mm <br />0.15 m <br />) +
tree +, shrub +  and subshrub +
lanceolate +  and diamond--shaped +