This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol1", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Low herbs, with fleshy tubers and few axillary flowers. Sepals and petals separate, nearly equal. Lip erect, slightly clawed, somewhat 3-lobed, crestless and spurless. Column club-shaped above. Anther terminal, stalked, attached to the back of the column, its sacs parallel; pollinia 1 in each anther-sac, powdery-granular, without caudicles. Stigma a flattened disk below the anther. Capsule oval, drooping. [Greek, bearing 3 flowers.]
(II.) 21: 230. 1800. Triphora pendula Nutt. Gen. 2: 193. 1818. Pogonia pendula Lindl. Bot. Reg. pi. 908. 1825. PogOnia trianthophora B.S.P. Prel. Cat. N. Y. 52. 1888. Triphora trianthophora Rydb. in Britton, Man. 298. 1901.
Stems glabrous, 3'-8' high, from a tuberous root, often clustered. Leaves 2-8, alternate, ovate, 3"-9' long, clasping; flowers 1-7, on axillary peduncles, pale purple, at first nearly erect, soon drooping; perianth 6"-8" long; sepals and petals about equal, connivent, elliptic, obtuse; lip clawed, somewhat 3-lobed, roughish or crisped above, not crested, about as long as the petals; capsule oval, drooping, about 6" long.