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A new invasive species for Martha’s Vineyard. Branchlets pilose with hairs of different lengths. Leaf blades pubescent on abaxial midrib. Basal, connate portion of corolla >5 mm long, exserted from calyx. Anthers not surpassing tips of corolla lobes. Panicles compact, 1.5-4 cm long. Pedicels 0.5-2 mm long. Moderately dense pubescence of calyces and pedicels supports ID of var. obtusifolium. (Identified using the key of A Haines, Flora Novae Angliae 2011.)