ORCHID ACE ; 625 



only the anther opposite to the lower sepal perfect and 2 rudi- 

 mentary lateral ones, in Cypripedium the lateral ones perfect, 

 the third sterile. Anthers '2-celled. Pollen more or less coher- 

 ent in 1-4 masses, rarely wholly granular. Stigma oblique and 

 concave, mostly viscous, the upper margin often pro luced into 

 an erect beak. Capsule coriaceous or membranceous, dehiscing 

 usually by 3 placentif erous valves which separate from the per- 

 sistent midveins of the carpels. Seeds very numerous, scobi- 

 jOrm, without albumen. 



TBIRE i Anther one, resting like a lid upon the column, de- 

 ciduous. Pollen masses 4, smooth and waxy. 



1 Calypso Scape solitary and 1-flowered, from a solid bulb, with a single 



green leaf : lip saccate : column broadly winged. 



2 Corallorhiza Stems one to several from a branched coral-like root : 



leaves all reduced to scale-like bracts: flowers in a terminal raceme, 

 spurred or gibbous at base : lip expanded or concave, bilamellate-crest- 

 ed : column semiterete. 



TRIBE n Anther one, connate with the column and resting 

 upon its face just above the stigma. Pollen masses 2, of coarse 

 grains united by an elastic web. 



3 Habenaria Stems one to several from a solid corm : flowers numerous, 



in a terminal raceme : lip flat, spurred. 



TRIBE HI Anther 1, erect and sessile or nearly so upon the top 

 of the column, more or less covering and declinate upon the back 

 of the stigma. Pollen masses 2 or 4, of loosely cohering grains. 



4 Gyrostachys Stems one to several from fleshy fascicled roots : flowers 



numerous in a twisted spike: lip flat, the base embracing the short 

 column. 



5 Peramium Stem solitary from a somewhat creeping rootstock : flowers 



several in a terminal spike; lip saccate, entire, free from the column. 



6 Lister a 8 tern solitary from a fascicle of fleshy- fibrous roots with a pair 



of sessile leaves in the middle ; flowers rather few, in a terminal raceme : 

 lip flat. 2-lobed. 



7 Epipactis Stems stout, leafy, several from fleshy-fibrous roots : lip 



concave, somewhat jointed in the middle and auriculate at base: 

 anther sessile behind the beaked stigma. 



8 Cephalanthera Stems stout, from a somewhat creeping rootstock: 



flowers in a terminal raceme : lip concave and auriculate at base : an- 

 ther shortly stipitate : stigma beakless. 



TRIBE iv Perfect anthers 2, lateral. Pollen pulpy-granular. 



9 Cypripedium Stems leafy, from more or less creeping rootstocks : 



flowers mostly few, in a terminal raceme : lip an inflated sac. 



Tribe 1 Malaxidex Lindl. Orch. 3 H'.rbs with simple stems 

 without green foliage, or a single green radical leaf. Anther one, 

 terminal and resting like a lid upon the column, deciduous. Pollen 

 masses 4-> smooth and waxy. 



