Lysimachia vulgaris is a perennial C3 herb (Pooter et al. 1990), to 1 m tall, colonial from rhizomes 40-80 cm long, stems softly sticky-hairy.
Leaves opposite or whorled, 7-12 cm long, surface sprinkled with tiny dots, softly hairy below, lance-shaped, to 13 x4 cm, tip long-pointed, softly-hairy below.
Flowers yellow, to 2.5 cm wide, regular, petal lobes 0.8-1.2 cm long, calyx lobes 0.3-0.5 cm long, margins dark red; inflorescence of terminal and upper axillary racemes; blooms June-Sept..
Fruit dry, a capsule.
Wetland status: FAC+.
Frequency in NYC: Very infrequent.
Habitat: Escaped from cultivation.
Notes: Listed as a noxious weed in CT and WA.