Stems erect, 2 to 6 feet high, glabrous or pubescent below, finely pubescent above in the panicle. Leaflets 2 to 8 inches long, longer than the petioles, ovate or ovate-lanceolate, long pointed, smooth or nearly so above, usually pubescent beneath; stipules lanceolate, sharp pointed. Flowers large, purple, one-third to one-half of an inch long with cuspidate, striate, deciduous bracts; calyx deeply two-lipped, the upper lip two-toothed. Loment 1 to 3 inches long, three to seven-jointed, the joints obliquely oblong, about twice as long as wide, pubescent with hooked hairs, on a stipe about as long as the lower calyx lobes.
In open woods and thickets, Maine to Ontario, Minnesota, Florida, Missouri, Arkansas and Texas. Flowering in August and September.
Memoir 15 N. Y. State Museum
Large-Bracted Tick Trefoil - Meibomia bracteosa