The specific name, _monophylla_, refers, inappropriately, to the one leaf, since each of our New England species are 1-leaved. Small woodland orchid, with bulbous root. June 20th-July 25th-August 2d. =Flowers= whitish, in a club-like raceme, 1-3 inches long, ¼-½ inch thick; flowers ¹⁄₁₂ inch long, minute, pedicels nearly erect, subtended by bracts ⅙ inch long. =Labellum= ovate, acuminate, notched on sides. =Sepals= and =petals= acute, narrow. =Stem=, 4-6 inches high. =Leaf=, 1, sheathing at its base, 1-2 inches long, distinguished from following species, _A. unifolia_, by being near base of stem instead of middle. _Continental Range_—From New Brunswick, Nova Scotia, southward to Vermont, doubtfully reported for New Bedford, Massachusetts; westward to Oneida, New York, Pennsylvania, Minnesota, Indiana, and Texas. _New England Range_—Maine, infrequent; New Hampshire, rare; Vermont, Pownal, Swamp of Oracles (Marcus White), rare; Massachusetts, Berlin, and Spencer (Dr. G. E. Stone); Mount Greylock bog, North Adams (Marcus White), rare. 2.—ACHROANTHES UNIFOLIA (Michaux) Rafinesque, 1803-1808 GREEN ADDER’S-MOUTH The specific name, _unifolia_, one-leaved, refers, like the preceding species, to the 1 leaf. Small damp woodland orchid, with bulbous root. May-June 26th (South)-July 25th-August 10th-September (North). =Flowers= in club-shaped raceme 1-3 inches long, 1 inch thick; greenish, minute, ¹⁄₁₂ inch long, pedicels slender, spreading, ¼-½ inch long. =Labellum= broad, 3-toothed at apex. =Sepals= oblong. =Stem=, 4-10 inches high. =Leaf=, 1, near the middle of stem, clasping, nearly orbicular. =Seed-capsule= oval, drooping. _Continental Range_—From Newfoundland, Ontario, southward to Florida; westward to Missouri and Minnesota. Ascends 4000 feet altitude in North Carolina. _New England Range_—Maine, frequent; New Hampshire, frequent; Vermont, Pownal (Grace G. Niles), rare; Massachusetts, Mount Greylock pasture, North Adams (Marcus White), rare; Rhode Island, rare; Connecticut, rare. [Illustration: =The Green Adder’s-Mouth.= (_Achroanthes unifolia._)] X Leptorchis Thouars, 1808 (_Liparis_ Richard, 1818) LILY-LEAVED TWAYBLADE The generic name, _Leptorchis_, comes from the Greek, referring to a slender orchid. The former name, _Liparis_, referred to the smooth and shining leaves of these plants. Small low orchids with bulbous roots. =Anther=, 1. =Labellum= nearly flat, often bearing 2 tubercles above the base. =Sepals= and =petals= spreading, petals usually narrow. =Flowers= in a terminal raceme, numerous and showy. =Pollinia=, 4, 2 in each anther-sac, smooth and waxy, slightly united, without stalks or glands. =Stem= or =scape=, 2-10 inches high. =Leaves=, 2, basal, broad, oval and shining, with several sheathing scales at base. Two or three seasons bulbs adhere to the latest bulb, and in time wither away. =Seed-capsule= long, erect, club-shaped.