Heterotheca villosa var. villosa

Endemic
Synonyms: Chrysopsis mollis Nuttall
Treatment appears in FNA Volume 20. Treatment on page 250. Mentioned on page 249, 251, 252, 256.

Stems decumbent to erect, 16–39 cm, moderately to densely strigose, sparsely to abundantly long-hirsute, eglandular or sparsely stipitate-glandular. Distal cauline leaf blades oblanceolate, 21–35 × 3.5–6 mm, bases narrowly cuneate to attenuate, margins flat, apices acute, faces moderately strigose (20–60 hairs/mm2), eglandular or sparsely stipitate-glandular. Heads 1–12(–25). Peduncles (5–)12–47(–67) mm, sparsely to densely hispido-strigose, eglandular; bracts subtending heads usually none, rarely linear-oblanceolate, leaflike. Involucres narrowly cylindric to campanulate (fresh), (5–)6–9(–11) mm. Phyllaries narrowly triangular-lanceolate, margins usually reddish purple distally, faces moderately to densely strigose, eglandular. Ray florets 10–27(–38), laminae (6.5–)8.5–15(–20) mm. 2n = 18, 36.


Phenology: Flowering (May–)Jun–Oct(–Nov, south).
Habitat: Silty, sandy loam or clay soils, chalk, or granitic soils, gravel soils, dry shale-limestone soils, red sandstone soils, travertine soils of sandhill prairies, pastures, grasslands, roadsides, railroad rights-of-way
Elevation: 300–2300(–2900) m

Distribution

V20-545-distribution-map.gif

Alta., B.C., Man., Ont., Sask., Colo., Idaho, Ill., Kans., Mich., Mont., Nebr., N.Dak., Oreg., S.Dak., Wash., Wyo.

Discussion

Variety villosa grows primarily in the Great Plains region; it is rare in Colorado, Idaho, Illinois, Kansas, and Oregon, and represented in Michigan and southern Ontario by chance introduction.

Selected References

None.

Lower Taxa

None.
John C. Semple +
(Pursh) Shinners +
Amellus villosus +
Alta. +, B.C. +, Man. +, Ont. +, Sask. +, Colo. +, Idaho +, Ill. +, Kans. +, Mich. +, Mont. +, Nebr. +, N.Dak. +, Oreg. +, S.Dak. +, Wash. +  and Wyo. +
300–2300(–2900) m +
Silty, sandy loam or clay soils, chalk, or granitic soils, gravel soils, dry shale-limestone soils, red sandstone soils, travertine soils of sandhill prairies, pastures, grasslands, roadsides, railroad rights-of-way +
Flowering (May–)Jun–Oct(–Nov, south). +
Field & Lab. +
Chrysopsis mollis +
Heterotheca villosa var. villosa +
Heterotheca villosa +
variety +