Difference between revisions of "Silphium compositum"
Fl. Bor.-Amer. 2: 145. 1803.
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Revision as of 18:47, 24 September 2019
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. 2n = 14.
Phenology: Flowering summer–early fall.
Habitat: Open, pine and oak forests, sandy soils, fields, roadsides, meadows
Elevation: 0–1600 m
Distribution
Ala., Fla., Ga., N.C., S.C., Tenn., Va., W.Va.
Discussion
Selected References
None.