Petioles 4-20 (avg 10) mm, usually exceeding the stipules, a fifth to a tenth as long as the blade; lvs pilose on the veins beneath, at least near the base, otherwise glabrous. Rocky woods; s. Ont. to N.D., sw. to Ark. and Okla. (V. affine)

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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