Family: Apocynaceae
Herbaceous Periwinkle
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More herbaceous, with scabrous lvs that have narrowly ascending (or obscure) primary lateral veins, the flowering branches not erect, is reported to be locally established in Mass.
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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