Triosteum aurantiacum is a perennial herb to 1.3 m tall; stems less hairy than t. perfoliatum.
Leaves opposite, tapering to distinct, unfused base, hairy below.
Flowers red-purple, tubular, to 1.7 cm long, irregular, densely glandular-hairy, base swollen on one side, petal-lobes 5, unequal, spreading, calyx lobes to 1.8 cm long, 0.1 cm wide, hairy, linear; blooms May-July.
Fruit fleshy, bright red-orange, Aug.-Oct.
Wetland status: UPL.
Frequency in NYC: Very infrequent.
Habitat: Rich woods, edges.