Silphium integrifolium var. laeve

Torrey & A. Gray

Fl. N. Amer. 2: 279. 1842.

Endemic
Basionym: Silphium speciosum Nuttall Trans. Amer. Philos. Soc., n.s. 7: 341. 1840
Treatment appears in FNA Volume 21. Treatment on page 80.

Plants 100–150 cm. Leaves: blades glabrous. Phyllaries: abaxial faces glabrous. Ray florets 20–36+. Disc florets 130–225. 2n = 14.


Phenology: Flowering mid summer–early fall.
Habitat: Prairies, along roads and railroads
Elevation: 100–600 m

Distribution

V21-181-distribution-map.gif

Ont., Ark., Iowa, Kans., Mo., Nebr., N.Mex., Okla., Tex., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.
Jennifer A. Clevinger +
Torrey & A. Gray +
Silphium speciosum +
Ont. +, Ark. +, Iowa +, Kans. +, Mo. +, Nebr. +, N.Mex. +, Okla. +, Tex. +  and Wyo. +
100–600 m +
Prairies, along roads and railroads +
Flowering mid summer–early fall. +
Fl. N. Amer. +
Undefined (tribe Undefined) subtribe Enceliinae +, Undefined (tribe Undefined) subtribe Engelmanniinae +, Undefined (tribe Undefined) subtribe Spilanthinae +, Undefined (tribe Undefined) subtribe Verbesininae +  and Undefined (tribe Undefined) subtribe Zinniinae +
Silphium integrifolium var. laeve +
Silphium integrifolium +
variety +