ORCHIDACE^. (orchis FAMILY.) 453 



* * Stems sheathed. 



3. 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. EPIDENDREjE. — Polleu 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. 



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



TRfflE III. ARETHUSEjE. — Pollen in loose powdery masses. Lip crested. 



8. CALOPOGON. Pollen-masses 2, bipartible. Column incurved, winged at the apex. 



9. POGOXIA. 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 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 HABEN.Aill.A. Anther-cells diverging. Glands naked. Throat of the stigma furnished 



with variously shaped appendages. 



Tribe V. 1VEOTTIE.E. —Anther attached to the back of the column, parallel witk 

 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. 



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

 Tribe VI. CYPRIPEDIE^E. —Column appendaged by the petal-like sterile stamen. 



19. CYPRIPEDIU.M. Lip large, inflated. Leaves large, plaited. 



1. MICROSTYLIS, Nutt. Adder's-Modth. 



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. 



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, Miikl.) — Low shady woods, Florida, and northward. July and 

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



