ORCHIDACE^E. (ORCHIS FAMILY.) 453 



* * Stems sheathed. 



3. CORALLORIIIZA. Spur of the lip abort and aduate to the ovary. Root branching, 



toothed. 



4. APLECTRUM. Lip spurless. Root of two solid connected tubers, bearing a single leaf. 



Tribe II. EPIDEKDREJE. — Pollen in smooth waxy masses connected by elastic 

 tissue, 

 o. EPIDEXDRUM. Pollen-masses 4. Claw of the spurless lip adnate to the column. 



6. TIPULARIA. Pollen-masses 4. Lip free, spurred. Stem sheathed. 



7. BLETIA. Pollen-masses 8. Lip free, hooded, spurless. 



Tribe III. ARETHUSEJE. — Pollen in loose powdery masses. Lip crested. 



8. CALOPOGON. Pollen-masses 2. bipartible. Column incurved, 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. 



II. Anther solitary, adnate to the column, erect, persistent. 

 Tribe IT. OPHRYDEiE. —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 GYMXADEXIA. Anther-cells contiguous, parallel. Glands of the stigma naked. 

 13- PLATAXTIIERA. Anther-cells diverging from the base. Glands of the stigma naked. 



14 IIABEXARIA. Anther-cells diverging. Glands naked. Throat of the stigma furnished 



with variously shaped appendages. 



Tribe Y. NEOTTIE^J. —Anther attached to the back of the column, parallel with 

 the stigma ; the cells approximate. Pollen powdery. 



* Pollen-masses 2. 



15 SPIRAXTIIES. Lip nearly entire, clasping the column, obtuse. 



16. GOODYEltA. Lip sessile, entire, contracted above the middle, slender-pointed. 



17. LISTEHA. Lip 2-cleft. Stem with a pair of ovate opposite leaves. 



* * Pollen-masses 4. 



18. POXTHIEVA. Claws of the petals and lip adnate to the column. 



m. Anthers two, fixed beneath the lateral lobes of the column. 

 Tribe YI. CYPRIPEDIEJE. —Column appendaged by the petal-like sterile stamen. 



19. CYPRIPEDIUM. Lip large, inflated. Leaves large, plaited. 



1. MICROSTYLIS, Xutt. Adder's-Moutii. 



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 raeemed or spiked, 

 minute, greenish. 



1. M. ophioglossoides, Xutt. 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 aurieled at the base, 3-toothed at the apex. (Malaxis ophi- 

 tdea, MM.) — Low shady woods, Florida, and northward. July and 

 Aug. — Stem 4' - 8' high. Leaf 1 ' - 2' long. Flowers } 2 " wide. 



