Another European sp., is also occasionally intr. in our range. It is much like G. scorzonerifolia, but the cal and pedicels are glabrous, and the lvs are sometimes wider, to 3.5 cm.

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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