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Silphium albiflorum
Silphium albiflorum
A. Gray
Family:
Asteraceae
Flora of North America
Resources
Jennifer A. Clevinger in Flora of North America (vol. 21)
Plants
scapiform, 20-75 cm; taprooted.
Stems
terete, glabrous, hirsute, hispid, or scabrous.
Leaves:
basal persistent, petiolate; cauline usually alternate, rarely subopposite, petiolate or sessile; blades deltate, elliptic, linear, ovate, or rhombic, 2-40 × 1.5-26 cm, sometimes (proximal) 1-2-pinnately lobed, bases attenuate, cuneate, or truncate, ultimate margins unevenly toothed or entire (distal blades), apices acuminate to apiculate, faces scabrous to hirsute.
Phyllaries
23-36 in 2-3 series, outer reflexed, apices acuminate, abaxial faces hispid.
Ray florets
14-30; corollas white.
Disc florets
70-130; corollas white.
Cypselae
12-26 × 7-12 mm;
pappi
2-5 mm. Flowering late spring-summer. Prairies, open fields, calcareous soils; 100-500 m; Tex.
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