16. Habenaria. The two glands naked, either approximate or widely separated.
Tribe IV. CYPRIPEDIEÆ. Perfect anthers 2, lateral, the sterile one forming a dilated fleshy appendage above the terminal stigma. Pollen granular, not in masses.
17. Cypripedium. Stems more or less leafy. Perianth spreading; lip an inflated sac.
1. MICRÓSTYLIS, Nutt. Adder's-Mouth.
Sepals oblong, spreading. Petals thread-like or linear, spreading. Lip auricled or ovate at base, not tubercled, entire or nearly so. Column very small, terete, with 2 teeth or auricles at the summit and the erect anther between them. Pollen-masses 4, in one row (2 in each cell), cohering by pairs at the apex, waxy, without any stalks, threads, or gland.—Low herbs, from solid bulbs, producing simple stems, which bear in our species a single leaf and a raceme of minute greenish flowers. (Name composed of μικρός, small, and στυλίς, a column or style.)
1. M. monophýllos, Lindl. Slender (4–6´ high); leaf sheathing the base of the stem, ovate-elliptical; racemes spiked, long and slender; pedicels not longer than the flowers; lip long-pointed.—Cold wet swamps, N. New Eng. to Penn., N. Ind., Minn., and northward. July. (Eu.)
2. M. ophioglossoìdes, Nutt. Leaf near the middle of the stem, ovate, clasping; raceme short and obtuse; pedicels much longer than the flowers; lip truncate-3-lobed at the summit, the middle lobe very small.—Low moist ground, N. Scotia to Fla., west to Minn. and Mo. July.—Pollinia (at least sometimes) only 1 in each cell.
2. LÍPARIS, Richard. Twayblade.
Sepals and petals nearly equal, linear, or the latter thread-like, spreading. Lip flat, entire, often bearing 2 tubercles above the base. Column elongated, incurved, margined at the apex. Anther lid-like, terminal; pollen-masses 4, in one row (2 to each cell), slightly united in pairs, without stalk, threads, or gland.—Small, low herbs, with solid bulbs, producing 2 root-leaves and a low scape, which bears a raceme of few purplish or greenish flowers. (Name from λιπαρός, fat or shining, in allusion to the smooth or unctuous leaves.)
1. L. liliifòlia, Richard. Leaves ovate; petals thread-like, reflexed; lip large (1½´ long), wedge-obovate, abruptly short-pointed, brown-purplish.—Moist woodlands, N. Eng. to Ga., west to Minn. and Mo. June.