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Silphium radula var. gracile
Family:
Asteraceae
Flora of North America
Resources
Jennifer A. Clevinger in Flora of North America (vol. 21)
Plants
30-100 cm.
Basal leaves
persistent.
Heads
to 15.
Ray florets
12-18.
Disc florets
100-150.
2
n
= 14. Flowering summer. Prairies, fencerows, roadsides; 0-300 m; La., Tex.
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