ORCHIDACER. (ORCHIS FAMILY.) 453 
» * Stems sheathed. 
8. CORALLORHIZA. Spur of the lip short and adnate to the ovary. Root branching, 
toothed. — : 
4 APLECTRUM. Lip spurless. Root of two solid connected tubers, bearing a single leaf. 
TRIBE II. EPIDENDREÆ. — Pollen in smooth waxy masses connected by elastic 
tissue. 
5. EPIDENDRUM. Pollen-masses 4. Claw of the spurless lip adnate to the column. 
6. TIPULARIA. Pollen-masses 4. Lip free, spurred. Stem sheathed. 
T. BLETIA. Pollen-masses 8. Lip free, hooded, spurless. 
Teme III. ARETHUSEZE. — Pollen in loose powdery masses. Lip crested. 
8. CALOPOGON.  Pollen-masses 2, bipartible. Column ineurved, winged at the apex. 
9. POGONIA. Pollen-masses 2. Column wingless, club-shaped. 
10. ARETHUSA. Pollen-masses 4. Column petal-like. Root a solid tuber. 
IL. Anther solitary, adnate to the column, erect, persistent. 
Tare IV. OPHRYDEJE. — Anther adnate to the apex of the column, the cells sep- 
arate. Pollen cohering in numberless waxy grains, which are collected by elastic tissue 
. into a large mass, and attached to a gland of the stigma by an elastic stalk. Lip spurred. 
11. ORCHIS. Anther-cells contiguous, parallel. Glands of the stigma covered with a common 
hood-like fold of the stigma. 
12. GYMNADENIA. Anther-cells contiguous, parallel. Glands of the stigma naked. 
13. PLATANTHERA. Anther-cells diverging from the base. Glands of the stigma naked. 
14. HABENARIA. Anther-cells diverging. Glands naked. Throat of the stigma furnished 
with variously shaped appendages. : scis 2 
Teme V. NEOT'TIEJE. —Anther attached to the back of the column, parallel with 
the stigma ; the cells approximate. Pollen powdery. 
: * Pollen-masses 2. 
15. SPIRANTHES. Lip nearly entire, clasping the column, obtuse. 
16. GOODYERA. Lip sessile, entire, contracted above the middle, slender-pointed. 
17. LISTERA. Lip 2-cleft. Stem with a pair of ovate opposite leaves. 
* * Pollen-masses 4. 
18. PONTHIEVA. Claws of the petals and lip adnate to the column. 
II. Anthers two, fixed beneath the lateral lobes of the column. 
Trae VI. CYPRIPEDIEJE. — Column appendaged by the petal-like sterile stamen. 
19. CYPRIPEDIUM. Lip large, inflated. Leaves large, plaited. 
1. MICROSTYLIS, Nutt. Avper’s-Movurn. | 
Sepals oblong, spreading. Petals filiform. Lip cordate or sagittate, entire or 
nearly so, sessile. Column minute, 2-toothed at the apex. Anther lid-like. 
Pollen-masses 4, collateral, united by pairs at the apex. — Low herbs, from 
bulbous roots. Stem 1-2-leaved, sheathed below. Flowers racemed or spiked, 
minute, greenish. x 29 ; 
1. M. ophioglossoides, Nutt. Leaf solitary near the middle of the 
5-angled stem, ovate, clasping; raceme short, with the unexpanded flowers 
crowded in a globular head, elongated in fruit; pedicels slender, much longer 
than the flowers ; lip auricled at the base, 3-toothed at the apex. (Malaxis ophi- 
. oglossoides, Mull.) Low shady woods, Florida, and northward. July and 
Aug. — Stem 4'-8' high. Leaf 1'-2! long. Flowers j" wide. DU 
