Helianthus petiolaris subsp. petiolaris

IllustratedEndemic
Synonyms: Helianthus couplandii B. Boivin
Treatment appears in FNA Volume 21. Treatment on page 153. Mentioned on page 152.

Stems usually hispidulous to strigillose, rarely ± hirsute to glabrate. Leaves: abaxial faces sparsely, if at all, gland-dotted. Peduncles usually bractless. Phyllaries 3–5 mm wide. Disc corollas: throats abruptly narrowed distal to densely hairy basal bulbs. 2n = 34.


Phenology: Flowering early summer–fall.
Habitat: Dry open areas, usually sandy soils
Elevation: 10–1500(–2000) m

Distribution

V21-360-distribution-map.gif

Alta., Man., Ont., Sask., Ariz., Ark., Calif., Colo., Conn., Del., D.C., Idaho, Ill., Ind., Iowa, Kans., La., Maine, Mass., Mich., Minn., Mo., Mont., Nebr., Nev., N.J., N.Mex., N.Y., N.C., N.Dak., Ohio, Okla., Oreg., Pa., S.C., S.Dak., Tenn., Tex., Utah, Va., Wash., W.Va., Wis., Wyo.

Discussion

Subsp. petiolaris is native to western North America and adventive elsewhere (e.g., introduced in Ontario). Hybrids with with H. annuus and H. debilis have been reported.

Selected References

None.

Lower Taxa

None.
Edward E. Schilling +
Nuttall +
Alta. +, Man. +, Ont. +, Sask. +, Ariz. +, Ark. +, Calif. +, Colo. +, Conn. +, Del. +, D.C. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, La. +, Maine +, Mass. +, Mich. +, Minn. +, Mo. +, Mont. +, Nebr. +, Nev. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Okla. +, Oreg. +, Pa. +, S.C. +, S.Dak. +, Tenn. +, Tex. +, Utah +, Va. +, Wash. +, W.Va. +, Wis. +  and Wyo. +
10–1500(–2000) m +
Dry open areas, usually sandy soils +
Flowering early summer–fall. +
J. Acad. Nat. Sci. Philadelphia +
Illustrated +  and Endemic +
Helianthus couplandii +
Helianthus petiolaris subsp. petiolaris +
Helianthus petiolaris +
subspecies +