KEY. 345 



758. Anther 1, either terminal or dorsal on the stigma. 



759 

 Anthers 2, hoth fertile, fixed below the lateral 

 lobes of the column ; moreover a petaloid sterile stamen. 

 Lip large, inflated, forming a somewhat slipper-shaped sac. 



Cypripedium. 



759. Lip anterior 760 



Lip posterior, on a narrowed stalk, dilated and 



bearded above with white, yellow, and pui-ple hairs. Pollen- 

 masses 2, bipartible. Column petal-like, incurved, winged at 

 the apex. Scape 3-5 inches high, 2- to 5-flowered, sheathed 

 below by the base of the grass-like leaf. 



Calopogou pulchellus, R. Br. 



760. Lip spurred, the spur perfectly free from the ovary. 

 Anther terminal '761 



Lip spurless, or spur adnata to the ovary. Anther 

 terminal, or dorsal 764 



761. Anther erect. Pollen-masses 2, granular, borne on 

 a stalk, its base attached to the 2 glands of the stigma. .762 



Anther lid-like, over the stigma, at length decidu- 

 ous. Pollen-masses 4 (or rather 2, and 2-parted), connected by 

 a linear stalk with the transverse small gland. Column nar- 

 row. Lip short and flat; its spur long and thread-like. 

 Raceme many-flowered, on a naked scape. Flowers small, 

 greenish, tinged with purple. Leaf solitary, ovate, plaited 

 and tinged with purple beneath. 



Tipularia discolor, Is utt. 



762. Glands naked. Lip entire, toothed, lobed, dis- 

 sected, or fringed 'i'63 



Glands confined in a little pouch or hooded fold. 

 Lip entire. Flowers showy, large, white with pink, in a 

 snike Scape 4-angled, 4-7 inches high. Leaves 2, oblong- 

 obovate. Bracts leaf like. Orchis spectabUis, L. 



763 Anther-cells parallel, contiguous. Glands close 

 together Lip entire or toothed. Flowers small, pale- 

 vellowisii green, or orange-yellow, spiked. Stem either only 

 with 2 or 3, or with several leaves. Gymnadenia. 



Anther-cells diverging below. Glands widely 

 =«narnted Lip entire, or lobed, cleft, dissected, ciliate- 

 fringed Platanthera, Rich. 



