The specific name, _oblongifolia_, refers to the oblong leaves. Damp, hilly woodland orchid with fleshy-fibrous roots. June-August. =Flowers= many in spiked raceme, yellowish-green similar or identical with the spike of flowers of _H. Hookeriana_. =Stem= 8-18 inches high, _not bracted_. =Leaves= 2, _oblong_, ascending. _Continental Range_—In similar situations with _H. Hookeriana_ and _H. orbiculata_, from Nova Scotia (Macoun) Campbellton, New Brunswick, (Chalmers), Chelsea Mountains, Quebec (Fletcher’s _Flora_, Ottawa); southward to New York (Paine and Dudley), New Jersey (Mrs. Britton), and throughout New England States; westward to Iowa. [Illustration: =A Group of Three Species of Genus Habenaria.= 1. =The Tall Northern Green Orchis.= (_Habenaria hyperborea._) 2. =The Tall Northern White Orchis.= (_Habenaria dilatata._) 3. =The Large Round-Leaved Orchis.= (_Habenaria orbiculata._)] 4.—HABENARIA OBTUSATA (Pursh) Richardson, 1814-1823[69] SUB-ALPINE GREENISH BOG-ORCHIS The specific name, _obtusata_, refers to the obtuse or blunt sepals and labellum of this species. Small sub-alpine bogland orchid, with fibrous roots. June 22d-July 30th-September. =Flowers=, greenish-yellow in loose spiked raceme 1-2½ inches long; flowers ¼ inch long. =Labellum= blunt or obtuse, deflexed, entire. =Lateral sepals= spreading, oblong and obtuse. =Petals= shorter, obtusely 2-lobed at base. =Stem= slender, _not bracted_, 4-10 inches high, 4-angled. =Leaf= 1, basal, obovate. _Continental Range_—From Alaska, southward throughout Canada to Mt. Wachusett, Massachusetts; westward to Minnesota, Wyoming, Montana, and Colorado. _New England Range_—Maine, frequent; New Hampshire, frequent; Vermont, rare; Massachusetts, very rare; Mt. Wachusett (Dr. G. E. Stone); Mt. Washington (Henry Baldwin); Rhode Island, not reported; Connecticut, not reported. 5.—HABENARIA HYPERBOREA (Linnæus) R. Brown, 1767-1813 TALL GREEN NORTHERN ORCHIS The specific name, _hyperborea_, refers to the species being tall and a boreal or northern orchid. Cold bogland or damp woodland orchid, with thick fleshy roots. May 30th-July 28th-August 18th. =Flowers= small, greenish-yellow, on bracted spike 3-8 inches long; infrequent, said to be constructed for self-fertilization, if insects fail to visit the flowers. =Labellum= lanceolate, obtuse, and entire. =Sepals= and =petals= obtuse, ovate, ⅙-¼ inch long; upper sepal crenulate at apex. =Stem= tall, stout, leafy, 8 inches to 3 feet high. =Leaves= many lanceolate, acute. =Seed-capsule= much twisted.