Petunia integrifolia is an annual herb, apparently erect, ca 40 cm tall, all parts sticky (clammy)-hairy.
Leaves alternate, 3-8 cm long, elliptic to egg-shaped, margin entire, stalked.
Flowers dark purple, tubular, radially symmetrical, corolla tube ca 3 cm long, flaring at top; calyx 5-parted, lobes narrow, ca 2 cm long, often unequal; stamens dark purple with pink filaments, inserted at base of corolla tube, shorter than corolla; stigma purple; flowers solitary in leaf axils, on long stalks. Apparently visited by bumble bees. (see photo).
Fruit dry, a capsule 2-parted with many seeds.
Wetland status: UPL.
Frequency in NYC: Very infrequent.
Origin: South America.
Habitat: Very infrequently escaping into open sites but not persistent.
Notes: A very common garden flower. A parent species of the hybrid garden Petunia (P. x hybrida = P. integrifolia x P. axillaris) natives of tropical America.