Gentiana andrewsii is a perennial herb, to 1 m tall from a stout root crown with long, coarse roots, stems clustered, hairless, usually unbranched.
Leaves opposite, stalkless, blade to 15 cm long, 4 cm wide, lance-shaped, pointed at both ends, margin hairy.
Flowers blue above, base whitish, radially symmetrical, to 4 cm long, tubular, somewhat swollen, petal lobes remaining closed; stalkless, in clusters of 2-5 at top of stem; blooms and fruits July-Oct. Flowers self fertile but must be pollinated by bumblebees (Costelloe 1988).
Fruit dry, a 2-parted capsule, seeds numerous 0.3 cm, broadly winged.
Wetland status: FACW.
Frequency in NYC: Very infrequent.
Habitat: Moist woods, meadows.