1. _H. orbiculata_ (Pursh) Torrey, 1814-1826. 2. _H. Hookeriana_ A. Gray, 1836. 3. _H. oblongifolia_ (Paine) Niles, 1865-1903. 4. _H. obtusata_ (Pursh) Richardson, 1814-1823. 5. _H. hyperborea_ (Linnæus) R. Brown, 1767-1813. 6. _H. media_ (Rydberg) Niles, 1901-1903. 7. _H. dilatata_ (Pursh) Hooker, 1814-1825. 8. _H. fragrans_ (Rydberg) Niles, 1901-1903. 9. _H. bracteata_ (Willdenow) R. Brown, 1805-1813. 10. _H. clavellata_ (Michaux) Sprengel, 1803-1826. 11. _H. flava_ (Linnæus) A. Gray, 1753-1840. 12. _H. ciliaris_ (Linnæus) R. Brown, 1753-1813. 13. _H. blephariglottis_ (Willdenow) Torrey, 1805-1826. 14. _H. holopetala_ (Lindley) A. Gray, 1835-1867. 15. _H. lacera_ (Michaux) R. Brown, 1803-1810. 16. _H. grandiflora_ (Bigelow) Torrey, 1824-1826. 17. _H. psycodes_ (Linnæus) A. Gray, 1753-1840. 18. _H. Andrewseii_ White n. sp. (per letter, 1903). 1.—HABENARIA ORBICULATA (Pursh) Torrey, 1814-1826 LARGE ROUND-LEAVED ORCHIS—HEAL-ALL—SHIN-PLASTERS The specific name, _orbiculata_, refers to the round or orbicular leaves of this plant. Tall spiked woodland orchid, with thick fibrous roots. June 17th-July 15th-August 5th. =Flowers= greenish-white, many in spiked raceme. =Labellum= oblong-linear, white, spur long. =Sepals= and =petals= ⅓ to ½ as long as labellum. Sepals spreading, petals smaller. =Stem= or scape 1-2½ feet high, _bracted_, occasionally producing one small stem-leaf. =Leaves= 2, basal, large, round, flat-lying, 4-7 inches in diameter. _Continental Range_—Not uncommon, but scarcely abundant, from Newfoundland, British Columbia, Lake Superior, southward to the western mountains of North Carolina; westward to Montana, Idaho, and Washington. _New England Range_—Maine, common; New Hampshire, common; Vermont, frequent; Massachusetts, occasional; Rhode Island, not reported; Connecticut, rather rare. 2.—HABENARIA HOOKERIANA A. Gray, 1836 SMALL, ROUND-LEAVED ORCHIS—HOOKER’S ORCHIS The specific name, _Hookeriana_, refers to Sir J. Hooker, who studied this orchid and in whose honor Dr. Gray designated it. Damp, hilly woodland orchid with fleshy-fibrous roots. June 10th-August 22d. =Flowers= many, subtended by small bracts in spiked raceme, yellowish-green; spike 4-8 inches long. =Labellum= linear-lanceolate, acute ⅓-½ inch long. =Sepals= and =petals= greenish, spreading; petals awl-shaped ⅓ inch long. =Stem= 8-18 inches high, _not bracted_. =Leaves= 2, oval, obovate, or orbicular, slightly ascending, 3-6 inches long. _Continental Range_—From Nova Scotia, Lake Huron, Lake Superior, southward to New Jersey and Pennsylvania, westward to Indiana, Minnesota, Wisconsin, and Iowa. _New England Range_—Maine, common; New Hampshire, frequent; Vermont, frequent; Massachusetts, occasional; Rhode Island, rare; Connecticut, rare. 3.—HABENARIA OBLONGIFOLIA (Paine) Niles, 1865-1903 SMALL OBLONG-LEAVED ORCHIS