159. ORCHIDACE^. 



1. Habenaria. 



in each anther-cell into 1, 2, or 4 pollinia which are free or attached 

 by pairs or fours to a viscus or gland, or to a stalk (caudide) which 

 terminates in a viscid gland ; by means of the gland the polhnia become 

 attached to the heads of insects and are withdrawn from their cells. 

 Ovary inferior, 1- rarely 3-celled ; stigma one or two viscid surfaces 

 on the top or front or on lateral processes of the column below or 

 between the anther or anthers. Seeds most minute and numerous, 

 testa lax, embryo not differentiated. 



All our species belong to the Mortavdne with a single antlier but species of 

 Cypripednnn with 2 anthers are often seen in cultivation. 

 I. Pollinia softly granular or sectile (in small masses), held 

 together by viscid threads (genera 1-6) : — 



A. Anther erect, neither opercular nor deciduous, with 



very short broad filament. Caudicles basal. 

 Column very short or 0, rostellum small erect or 0: — 

 Terrestrial. Caudicles lying in tubes of the anther- 

 cells ........ 



B. Anthers erect or inclined, but inverted, not deci- 



duous, filament slender or very minute, caudicles 

 or apical. Leaves convolute in bud, not articu- 

 late on the sheath : — 



1. Terrestrial, with tuberous rhizomes, inflorescence 



at the apex of the year's (underground) shoot : — 



a. Anther lying on the elongate rostellum which 



shows a deep cleft (rostellum 2-fid) on 

 removal of the pollinia : — 

 i. Stigma single, anticous : — 



Lip saccate at base .... 



Lip neither saccate nor spurred at base 

 ii. Stigmas 2 lateral. Pollinia 2 bipartite. 

 Lip saccate or cymbiform at the base, 

 inferior ..... 



b. Anther erect with the apex usually resting in 



cup-shaped top of column. Eostellum not 

 2-fid :— 

 Leaf one large plicate, following the flowers . 



2. Scandent, sympodium with elongate internodes . 

 II. Pollinia waxy 1-4 in each cell. Anther opercular, 



deciduous (genera 7 to end): — 

 A. Terrestrial orchids (exc. Oberonia, Pholidota and 

 Thunia in which inflorescence terminates the 

 members of a sympodium) (genera 7-16) : — 



1. Inflorescence terminating the successive sym- 



podially connected shoots. Leaves not 

 plicate : — 



a. Leaves equitant or conduplicate in bud : — 

 i. L. equitant. FIs. very minute. Small 



epiphytes 7. Oberonia. 



ii. L. not equitant. Flowers small, resupinate 



(lip dorsal) : — ■ 

 Lip Avith basal appendage. Column verj' 



short 8. MicrosUjlis. 



Lip without basal or auricular appendages. 



Column long with wings or callosities . 9. Liparis. 



b. Epiphytes. Leaves convolute in bud : — 

 Shoots pseudobulbous. Fl. small globose in 



the axils of distichous bracts . . .10. Pholidota. 



Stems leafy not pseudobulbous. FIs. large . 11. Thunia. 



2. Inflorescence axillary or on special lateral shoots. 



Leaves plicate : — 

 a. Pollinia 4 or 8, not attached to a gland of the 

 rostellum : — 

 FIs. large. Sep. and pet. spreading. Column 

 long 12. Phajus. 



1151 



2. Goody era. 



3. Spiranthes. 



4. Zeuxine. 



5. Pogonia. 



6. Vanilla. 



