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.
Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
(S. F. Blake) G. L. Nesom +
Aster multiflorus var. pansus +
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 +
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 +
Flowering Jul–Sep(rarely Oct). +
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 +