EcoFlora - Silphium albiflorum

Silphium albiflorum A. Gray
Family: Asteraceae White Rosinweed	FNA 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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