Aristolochia macrophylla is a high-climbing, twining vine; bark with distinctive aromatic odor (scratch & sniff); new growth green in winter, older bark gray, striated with numerous elongate lenticels that merge into lines.
Leaves large, heart-shaped, to 40 cm long and wide.
Flowers dark purplish, irregularly tubular, bent at a sharp angle like an old-fashioned smoking-pipe, to 4 cm long, 2.5 cm wide, very broadly 3-lobed at top, lobe tips pointed.
Fruit dry, cylindrical, to 8 cm long, splitting open to release numerous small seeds.
Wetland status: NL.
Frequency in NYC: Very infrequent.
Origin: Native to Appalachian mountains, from southern PA to GA. also horticultural.
Habitat: Rarely escaping into disturbed woodland.