Silphium asteriscus var. latifolium
Novon 14: 276. 2004.
Basionym: Silphium trifoliatum var. latifolium A. Gray
Synonyms: Silphium confertifolium SmallSilphium glabrum Eggert
Revision as of 01:56, 27 July 2019 by FNA>Volume Importer
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.
Phenology: Flowering mid summer–early fall.
Habitat: Fields, roadsides, disturbed areas
Elevation: 100–900 m
Distribution
Ala., Ga., Ky., La., Miss., N.C., S.C., Tenn., Va., W.Va.
Discussion
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.
Selected References
None.
Lower Taxa
None.