Stems 3—5 inches high, smooth below, glandular and with long silky scattered hairs among the flowers. Leaves oval, slightly sheathing, obtuse, an inch or more long, half as broad, generally smooth. Flowers few in a raceme; sepals and petals nearly equal, linear, obtuse, about ¼ of an inch long; lip half an inch long, obtuse at the apex with very obtuse lobes. Yellowish-green with a purplish middle and purple nerves radiating into the apical lobes, column slightly incurved, ⅛ of an inch long. Generally distributed throughout the Rockies but never abundant, seldom more than 3 or 4 plants being found together; flowering in July. [Sidenote: =Peramium Menziesi= (Lindl.) Morong. _Rattlesnake Plantain._] Plant 8—15 inches high from a hairy, creeping rootstock. Leaves basal, 1½—2½ inches long and a third as broad, tapering to both ends, dark green and veiny, sometimes blotched with white. Flowers ¼ to nearly ½ an inch long, yellowish- or greenish-white, in a slender spike; sepals and petals lanceolate, erect or nearly so about half the length of the lip, lip swollen at the base and with a long narrow recurved tip. Frequent in rich woods throughout the region, growing in moss, the evergreen leaves forming a rosette at the base of the stalk of flowers, which blossom in August. [Illustration: Limnorchis dilatatiformis Rydb. (⅙ Nat.) Purplish-Green Bog-Orchid.] [Illustration: Peramium Menziesii (Lindl.) Morong. (⅔ Nat.) Menzies’ Rattlesnake Plantain.] [Sidenote: =Peramium repens= (L.) Salisb. _Northern Rattlesnake Plantain._] Plant 6—10 inches high, glandular-hairy in the upper part of the stem. Leaves oblong-lanceolate, an inch or more long and a third as wide, tapering to both ends, green and usually blotched with white along the veins. Flowers small in a one-sided spike, greenish-white, about ¼ of an inch long, densely glandular-hairy on the outer surface; sepals and petals erect, ovate; lip sac-like with a narrow recurved tip. Frequent in the woods throughout the Rockies, flowering in July. [Sidenote: =Cœloglossum bracteatum= (Willd.) Parl. _Long-bracted Orchid._] Stem stout and leafy, 6—18 inches high, from a root of numerous fusiform tubers. Leaves lanceolate or ovate-lanceolate, 2—4 inches long. Flowers in a loose spike 2—3 inches long with bracts an inch long; flowers yellowish-green, sepals ovate-lanceolate, dilated at the base, ¼ of an inch long; petals very narrow or sometimes thread-like; lip nearly half an inch long, oblong-spatulate, 2—3-toothed or lobed at the tip, more than twice as long as the white sac-like spur. Frequent in open grassy woods and meadows throughout the Rockies; flowering in June. [Sidenote: =Limnorchis dilatatiformis= Rydb. _Purplish-Green Bog-orchid._]