More robust than no. 1 [Vinca minor L.], the flowering branches to 5 dm tall; lvs deltoid-ovate, 3-7 cm, ciliate; cor-tube 12-20 mm, the limb 3.5-5 cm wide; 2n=92. Native of s. Europe, occasionally escaped in s. U.S., n. to Va. and Ill. Apr., May.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.