Symphyotrichum ericoides var. pansum

(S. F. Blake) G. L. Nesom

Phytologia 77: 280. 1995.

Basionym: Aster multiflorus var. pansus S. F. Blake Rhodora 30: 227. 1928
Synonyms: Aster ericoides subsp. pansus (S. F. Blake) A. G. Jones Aster ericoides var. pansus (S. F. Blake) B. Boivin Aster ericoides var. stricticaulis (Torrey & A. Gray) F. C. Gates Aster multiflorus var. stricticaulis Torrey & A. Gray Aster pansus Symphyotrichum ericoides subsp. pansum (S. F. Blake) Semple Symphyotrichum ericoides var. stricticaule (Torrey & A. Gray) G. L. Nesom Virgulus ericoides var. pansus (S. F. Blake) Reveal & Keener
Treatment appears in FNA Volume 20. Treatment on page 496. Mentioned on page 484, 495.

Plants cespitose; with cormoid caudices, not strongly rhizomatous. Stems 1–10+, decumbent to ascending or erect to arching. Involucres broadly campanulate (fresh). 2n = 10.


Phenology: Flowering Jul–Sep(rarely Oct).
Habitat: Prairies and lower elevations in mountains, hillsides, lake shores, salt flats, stream banks and bars, railroad rights-of-way, roadsides, disturbed soils, seasonally dry grounds
Elevation: 200–2400 m

Distribution

V20-1112-distribution-map.gif

Alta., B.C., Man., N.W.T., Ont., Sask., Ariz., Colo., Idaho, Kans., Minn., Mont., Nebr., N.Mex., N.Dak., Oreg., S.Dak., Utah, Wash., Wyo.

Discussion

Variety pansum is reported to be rare in extreme western Kansas and Ontario (where it is introduced), extreme northeastern Arizona, and northwestern New Mexico. It has been introduced along railroads farther east. A. G. Jones (1978) treated this taxon as a subspecies with two varieties. Plants forming clumps with many, erect to arching, stout, usually densely hispido-strigose stems were called var. pansum; these occur mostly in British Columbia, Idaho, Oregon, and Washington. Plants in clusters with few, decumbent or ascending, slender, usually sparsely strigose stems were recognized by Jones as var. stricticaule; these are encountered mostly on the prairies and in the foothills of the Rocky Mountains from Alberta to Manitoba, Utah, and Wyoming.

Selected References

None.

Lower Taxa

None.
not tailed +, rounded +  and obtuse +
white-spine-tipped +
distinct +
spreading +  and reflexed or squarrose +
subequal +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +
indeterminate +  and determinate +
Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
(S. F. Blake) G. L. Nesom +
subclasping +  and clasping +
cuneate +  and attenuate +
indurate +
Aster multiflorus var. pansus +
3-nerved +, subpetiolate +  and sessile +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
oblong-ovate;linear;lanceolate or oblong +
reduced +
1.5mm;3.5mm +
rugulose +  and muricate +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
appressed +  and ascending +
linear +  and narrowly lanceolate +
secund +  and racemiform +
crowded +, arrays +  and fastigiate +
pyramidal +
barbellulate +  and barbellate +
rhizomatous +  and cormoid +
not 2-lipped +  and actinomorphic +
yellow becoming brown +, bluish +, pink +  and white +
at maturity , more or less ampliate , tubes usually shorter +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
purple turning brown +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
not compressed +, falcate +, obovoid +  and oblong-obovoid +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
Alta. +, B.C. +, Man. +, N.W.T. +, Ont. +, Sask. +, Ariz. +, Colo. +, Idaho +, Kans. +, Minn. +, Mont. +, Nebr. +, N.Mex. +, N.Dak. +, Oreg. +, S.Dak. +, Utah +, Wash. +  and Wyo. +
200–2400 m +
strigillose +, sericeous +, glabrous +, scabroso-hirsute +, hispid +, strigose +, hirsute +  and hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Prairies and lower elevations in mountains, hillsides, lake shores, salt flats, stream banks and bars, railroad rights-of-way, roadsides, disturbed soils, seasonally dry grounds +
disciform +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
campanulate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.7mm;1.2mm +
sessile +  and petiolate +
cauline +  and basal +
decurrent +
triangular +
entire +  and serrate +
ciliate +  and scabrous +
entire +, crenate +  and serrate +
2-carpellate +
persistent +
25 +  and 40 +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering Jul–Sep(rarely Oct). +
oblanceolate +  and more or less spatulate +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
branched +  and simple +
decumbent +  and ascending or erect +
1 +  and 10 +
appendaged +  and truncate +
papillate +  and smooth +
Aster ericoides subsp. pansus +, Aster ericoides var. pansus +, Aster ericoides var. stricticaulis +, Aster multiflorus var. stricticaulis +, Aster pansus +, Symphyotrichum ericoides subsp. pansum +, Symphyotrichum ericoides var. stricticaule +  and Virgulus ericoides var. pansus +
Symphyotrichum ericoides var. pansum +
Symphyotrichum ericoides +
variety +
at maturity , more or less ampliate , tubes usually shorter +
ampliate +
branched +  and eglandular +
80 cm800 mm <br />0.8 m <br /> (100 cm1,000 mm <br />1 m <br />) +
cespitose +  and colonial +
stipitate-glandular +
20 cm200 mm <br />0.2 m <br /> (80 cm800 mm <br />0.8 m <br />) +
plant +  and cespitose +
diamond--shaped +