Sterns & Poggenberg, Prelim. Cat., 3. 1888.
Plants 0.5-4 m. Leaves 2-13 × 1-8 cm. Flowers: corolla white to pale-pink or purplish, 10-17 × 3-7 mm. Capsules compressed-cylindric, ca. 10 mm. Seeds compressed-globose, lustrous. 2n = 32.
Phenology: Flowering summer–early fall.
Habitat: Moist coves, rocky woods, ledges, alluvial slopes, and thickets
Elevation: 0-1500 m
B.C., Man., N.B., N.S., Ont., Que., Conn., Del., Ill., Ind., Ky., Maine, Md., Mass., Mich., Minn., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., Tenn., Vt., Va., W.Va., Wis.
Adlumia fungosa is apparently naturalized in southwestern British Columbia. It was reported to be "freely escaping" from a garden in Alberta (H. Groh 1949), and it is a casual, but usually not persisting, escape elsewhere.
"thin" is not a number.