This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol1", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Stem slender, 4'-7' high, glabrous below, glandular above the leaves. Leaves large, 1 1/2'-2' long, oval or elliptic-ovate, borne above the middle of the stem; raceme many-flowered; rachis pubescent; pedicels and ovaries glabrous; sepals lance-ovate; petals oblong-linear, longer than the ovary, spreading, obtuse; lip slightly ciliate, oblong, broadest at the auricled base, cleft 1/4-1/8 its length; column rather stout, a little over 1" long.
Cedar swamps and wet banks, Quebec, Maine, New Hampshire and Vermont. July.
Ophrys cordata L. Sp. PI. 946. 1753.
Stem very slender, glabrous or nearly so, 3'-10' high. Leaves sessile, cordate, ovate, mucronate, 1/2'-l' long; racemes rather loose, 1/2'-2' long, 4-20-flowered; flowers purplish, minute; pedicels bracted, about 1" long; sepals and petals oblong-linear, scarcely 1" long; lip narrow, often with a subulate tooth on each side at the base, twice as long as the petals, 2-cleft, the segments setaceous and ciliolate; column very small, the clinandrium just appearing above the anther; capsule ovoid, 2" long.
Listera australis Lindl. Gen. & Sp. Orch. 456. 1840.
O. australis House, Bull. Torr. Club 32: 379. 1905-
Stem slender, 4'-10' high, more or less pubescent above. Leaves ovate, acutish, mucronate, glabrous, shining, 8"-10" long, 3-7-nerved; raceme 2-3' long, loosely 8-15-flowered; flowers yellowish green with purplish stripes; sepals and petals minute; lip 1/4'-1/2' long, 2-parted, split nearly to the base, 4-8 times as long as the petals, its segments linear-setaceous; column very small; capsule ovoid.
In bogs, Ontario, New York and New Jersey to Florida, Alabama and Louisiana. A third leaf is rarely borne below the flowers.