Flowers small, yellow, solitary, and terminal. Often intergrades with larger yellow species—(_C. hirsutum_); fragrant, the only _Cypripedium_ in the Atlantic region especially so. Labellum small, ½-1½ inch long, shoe-shaped, drooping lemon-yellow, lined with downy hairs and dotted lines of carmine. Sepals and petals brownish-purple, similar in texture; sepals 2 inches long, graceful, twisted, lower ones imperfectly united; petals glossy and twisting exceedingly. Stem leafy, slender, pubescent, 1-2 feet high. Leaves lanceolate, 3-5 inches long and 1-2¼ inches wide, pubescent, 7-9 nerved; not so villose as _C. hirsutum_ Miller. Said to produce poisonous effect similar to _Rhus_. _Continental Range_—In company with other species of New England _Cypripedium_; from Newfoundland, British Columbia, southward to Georgia; westward to the sub-humid regions of Kansas, extending slightly over the Continental Divide in Rocky Mountain region. Ascends 4000 feet altitude in Virginia. _New England Range_—Maine, frequent; New Hampshire, infrequent; Vermont, frequent; Massachusetts, frequent; Rhode Island, not reported; Connecticut, rather rare. 6.—CYPRIPEDIUM ACAULE Aiton, 1789 TWO-LEAVED LADY’S SLIPPER—STEMLESS PINK MOCCASIN-FLOWER The specific name, _acaule_, refers to the lowly and humble (acaulescent), growth of the species, since the flower is stemless, arising from a short or subterranean stem. Sphagnous bogland, _conifer_ or mixed woodland orchid with fleshy-fibrous roots. May 19th-June 20th. Flowers large, pink-purple, solitary, terminal, stemless. Labellum shoe-shaped, 2-2½ inches long, bi-lobed, pendulous, with closed fissure down its whole length, edges inflected, downy interiorly; pink-purple with darker veining of purple. (Rarely pure white flowers occur, with chrome yellow sepals and petals.) Sepals and petals brown-purple and green, shorter than labellum; two lower sepals wholly united. =Stem= very short, obscured by the basal leaves. =Scape= naked, 8-18 inches high, single-flowered, terminal. Few instances where two flowers or buds in embryo have occurred. =Leaves= 2, sheathing the base of peduncle, oblanceolate 3-5 nerved, hirsute and thickened; 6-8 inches long, 2-3 inches wide, resembling the leaves of _Orchis spectabilis_ Linnæus. _Continental Range_—From Newfoundland, and Fort Franklin, in latitude 54°-64° North; southward to Lookout Mountain, Mentone, and Cullman, Alabama; westward to northern Indiana, Minnesota, and Kentucky. _New England Range_—Maine, common; New Hampshire, common; Vermont, abundant; Massachusetts, abundant; Rhode Island, common; Connecticut, common. [Illustration: =The Pink Moccasin-Flower—The Stemless Lady’s-Slipper.= (_Cypripedium acaule._) Showing the structure of the pendulous and bi-lobed labellum, and the processes of the sepals and petals. The lower sepals are wholly united in this species, and less grace or undulation appears than in the Yellow Cypripediums.] II Orchis Linnæus, 1753 SHOWY ORCHIS