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Silphium terebinthinaceum
Silphium terebinthinaceum
Jacq.
Family:
Asteraceae
Flora of North America
Resources
Jennifer A. Clevinger in Flora of North America (vol. 21)
Plants
scapiform, (40-)100-250+ cm; taprooted.
Stems
terete, glabrous.
Leaves:
basal persistent, petiolate; cauline alternate, petiolate or sessile; blades cordate, deltate, lanceolate, ovate, or sagittate, 3-40 × 1-40 cm, sometimes (proximal) pinnately lobed, bases attenuate, cordate, hastate, round, or truncate, ultimate margins coarsely toothed or entire, apices acuminate, acute, or obtuse, faces glabrous or scabrous.
Phyllaries
23-33 in 2-3 series, outer appressed, apices obtuse to acute, abaxial faces glabrous.
Ray florets
17-29; corollas yellow.
Disc florets
120-140; corollas yellow.
Cypselae
7-13 × 4-10 mm;
pappi
0-1 mm.
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