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FNA | Family List | FNA Vol. 21 | Asteraceae | Helianthus

29a. Helianthus occidentalis Riddell subsp. occidentalis

Helianthus dowellianus M. A. Curtis; H. occidentalis var. dowellianus (M. A. Curtis) A. Gray

Leaves entire or nearly so, scabrous or hirsute, rough to touch.

Flowering late summer–fall. Fields, barrens; 10–600+ m; Ark., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., Md., Mass., Mich., Mo., N.J., N.C., Ohio, Pa., S.C., Tenn., Va., W.Va., Wis.

In its typical form, Helianthus occidentalis is distinctive with its relatively few basal leaves and scapiform stems. Still unresolved is the status of H. dowellianus, which may deserve recognition at some level. These plants have the head morphology of H. occidentalis but have multiple pairs of well-developed cauline leaves. Plants with this morphology are found in the southern Appalachian region from Maryland to Georgia. According to C. B. Heiser et al. (1969), these plants may be hybrids of H. occidentalis and H. atrorubens. Natural hybrids of H. occidentalis with H. mollis have been called H. ×cinereus Torrey & A. Gray. Hybrids of H. occidentalis with other species are known.


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