Stems 10 to 15 inches high, from long, perennial, horizontal, fleshy rootstocks, which give rise to new stems by buds. Stems bearing a whorl of five leaves at the summit. Leaves obovate, abruptly pointed at the apex, sessile, I to 4 inches long, usually only partially developed at flowering time. Flowers solitary, erect or declined, on a peduncle one-half to two-thirds of an inch long; sepals linear, dull reddish purple, spreading, 1 ½ to 2 inches long and about one-twelfth of an inch wide; petals linear, erect, blunt, light green and arching above the lip, about five-sixths of an inch long; lip three-lobed at the end, middle lobe broadest, white and crenulate on the margin; two lateral lobes of the lip and the lateral margins tinged and veined with bright crimson-purple, most vivid at the apex of the two lateral lobes, crest of the lip green and papillose. Capsule erect, 1 to 1 ½ inches long.
In moist soil of woods and thickets, often around cold sphagnum bogs, Ontario and Massachusetts to Michigan, Indiana and Florida. Flowering in May and June.
Figure IX Whorled Pogonia (Isotriaverticillata (Willdenow) Rafinesque)