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5a. Silphium perfoliatum Linnaeus var. connatum (Linnaeus) Cronquist, Brittonia. 29: 223. 1977.
Silphium connatum Linnaeus, Mant. Pl., 574. 1771; S. perfoliatum subsp. connatum (Linnaeus) Cruden
Stems glabrous or sparsely scabrous. Peduncles glabrous. 2n = 14.
Flowering summer–early fall. River bottoms; 50–500 m; N.C., Va., W.Va.
Variety connatum is known only from New River Valley.
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