Silphium asteriscus var. latifolium

(A. Gray) J. A. Clevinger

Novon 14: 276. 2004.

Endemic
Basionym: Silphium trifoliatum var. latifolium A. Gray in A. Gray et al, Syn. Fl. N. Amer. 1(2): 241. 1884
Synonyms: Silphium confertifolium Small Silphium glabrum Eggert
Treatment appears in FNA Volume 21. Treatment on page 82. Mentioned on page 81.

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

V21-190-distribution-map.gif

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.
Jennifer A. Clevinger +
(A. Gray) J. A. Clevinger +
Silphium trifoliatum var. latifolium +
Ala. +, Ga. +, Ky. +, La. +, Miss. +, N.C. +, S.C. +, Tenn. +, Va. +  and W.Va. +
100–900 m +
Fields, roadsides, disturbed areas +
Flowering mid summer–early fall. +
Silphium confertifolium +  and Silphium glabrum +
Silphium asteriscus var. latifolium +
Silphium asteriscus +
variety +