ORCHID FAMILY 317 



pollinia, attached at the base of a sticky disk, style often forming a beak at 

 the base of the anther, stigma a sticky surface beneath the beak of the style, 

 or in a cavity between the anther sacks, ovary below the perianth, 1-celled, 

 many-angled, capsule 3-valved, seeds very numerous ; flowers irregular, sol- 

 itary or in spikes or racemes ; perennial herbs with entire sheathing leaves, 

 sometimes scale-like, arising from conns, bulbs or tuberous roots. 



1. Stems reddish-brown or purplish, the leaves rep- 



resented by sheathing scales ; rootless, the un- 

 derground stems resembling branched coral Corallorrhiza 



2. Stems and leaves green 



a. Flowers mostly solitary and terminal, large, rose, 



purple or yellow 



( 1 ) Flower solitary, rose ; lip sack-like, with a 



tuft of yellow hairs Calypso 



(2) Flowers 1-3, yellow or purple; lip a large 



sack, not tufted Cypripedium 



b. Flowers more than 1, usually in spikes or 



racemes, mostly white or greenish 



(1) Leaves all basal 



(a) Basal leaf 1 ; flowers greenish-yellow Lysiella 



(b) Basal leaves several in a close rosette; 



flowers white or greenish-white Peramium 



(2) Stems leafy 



(a) Leaves 2, opposite, just below the 



raceme Listera 



(b) Leaves more than 2 and alternate 

 x. Capsules erect or ascending 



(x) Flowers spirally twisted on the 

 spike 

 m. Flowers white, fragrant Spiranthes 



n. Flowers greenish, not fragrant Piperia 

 (y) Flowers not spirally twisted 

 m. Petals lanceolate, lip entire Limnorchis 



n. Petals linear or thread-like ; lip 



lobed Coeloglosstm 



y. Capsules deflexed at maturity Epipactis 



Calypso Salisbury 1807 Calypso 



(Named for the goddess, Calypso) 



PI. 43, fig. 6. 



Sepals and lateral petals similar, rose, lip sack-like. 2-parted below. 



