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

12b. Silphium asteriscus Linnaeus var. latifolium (A. Gray) J. A. Clevinger, Novon. 14: 276. 2004.

Silphium trifoliatum Linnaeus var. latifolium A. Gray in A. Gray et al, Syn. Fl. N. Amer. 1(2): 241. 1884; S. confertifolium Small; S. glabrum Eggert

Plants 50–150 cm. Leaves: basal persistent or caducous; cauline mostly opposite; faces glabrous or sparsely hairy. Paleae puberulent. Ray florets 12–17. Disc florets 35–130.

Flowering mid summer–early fall. Fields, roadsides, disturbed areas; 100–900 m; Ala., Ga., Ky., La., Miss., N.C., S.C., Tenn., Va., W.Va.

Silphium confertifolium has persistent basal leaves and a diminutive stature that is due to environmental variation; it is best included in S. asteriscus var. latifolium.


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