A similar sp. [to D. ambiguum], sometimes also escapes. It has fewer fls in a short-corymbiform raceme, glabrous pistil, and follicles 8-14 mm. (Consolida regalis)

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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