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Silphium compositum
Silphium compositum
Michx.
Family:
Asteraceae
Flora of North America
Resources
Jennifer A. Clevinger in Flora of North America (vol. 21)
Plants
scapiform, 50-250 cm; taprooted.
Stems
terete, glabrous (sometimes glaucous).
Leaves:
basal persistent, petiolate; cauline alternate, petiolate or sessile; blades cordate, deltate, elliptic, hastate, ovate, reniform, or sagittate, 2-35 × 0.5-52 cm, sometimes (proximal) pinnately or palmately lobed, bases oblique, truncate, attenuate, cordate, sagittate, or hastate, ultimate margins toothed, apices acute, faces glabrous, hispid, or scabrous.
Phyllaries
11-18 in 2-3 series, outer appressed to reflexed, apices obtuse to cuspidate, abaxial faces sparsely scabrous.
Ray florets
6-12; corollas yellow.
Disc florets
20-85; corollas yellow.
Cypselae
6-12 × 4-10 mm;
pappi
1-4 mm.
2
n
= 14. Flowering summer-early fall. Open, pine and oak forests, sandy soils, fields, roadsides, meadows; 0-1600 m; Ala., Fla., Ga., N.C., S.C., Tenn., Va., W.Va.
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