15f> 43- BÜKMANNIACEAE — 44. ORCHIDACEAE 



3. Corolla regular. Stamens 3 ; connective without an appendage. Stigma 



3-parted. — Species i. West Africa (Cameroons). Oxygyne Schlecht. 



-Corolla irregular. Stamens 6 ; connective with an appendage. Stigma 



6-toothed. — Species 2. West Africa (Cameroons). (Under Thismia 



<irifl) Afrothismia (Engl.) Schlecht. 



SUBORDER GYNANDRAE 



FAMILY 44. ORCHIDACEAE 



Leaves with longitudinal nerves. Inflorescence of the racemose type. 

 Flowers irregular. Perianth more or less corolla-like or distinguished into 

 «calyx and corolla, one of the petals or segments (the lip) distinctly differing 

 from the others. Receptacle usually continued beyond the ovary and forming 

 the column upon which the stigma and the anther are inserted. Fertile stamen 

 I, belonging to the outer whorl. Staminodes sometimes present. Ovarj- 

 inferior, i-celled, with numerous parietal ovules. Stigmas or stigma-lobes 3, 

 ■one of them rudimentary or transformed into the rostellum, to which the 

 pollen-masses adhere. Seeds very small, exalbuminous ; embryo imperfectly 

 •developed. — Genera 96, species 1600. (Plate 26.) 



1. Pollen-masses with basal, stalk-like appendages, which adhere to the 



sticky, gland-like appendages of the rostellum. Root thickened into 



tubers. [Tribe ÜPHRYDEAE.] 2 



Pollen-masses with apical appendages or without appendages. . . 37 



2. Anther reflected, forming an angle with the column. Lip with 2 spurs or 



without a spur, but sometimes saccate or bearing appendages on the 



back 3 



Anther erect, having the same direction as the column, rarely slightly 

 reflected, but then lip with one spur 14 



3. Lip partly adnate to the column, usually bearing on its upper face a large 



appendage. Petals broad, converging and usually cohering \\ith the 



middle sepal into a hood. [Subtribe coryciinae.] .... 4 



Lip free from the cohmm, inserted at its base, rarely shortly adnate to it, 



but then petals not distinctly converging into a hood. [Subtribe saty- 



RIINAE.] 7 



4. Lateral sepals united nearly to the apex. — Species 10, South Africa. 



Corycium Swart z 

 Lateral sepals free 5 



5. Lateral sepals spurred or saccate. — Species 30. Southern and tropical 



Africa. Disperis Swartz 



Lateral sepals flat 6 



6. Column short. Lip broad at the base. Connective dilated. — Species 



15. South Africa. (Including Ommatodium Lindl.) Pterygodium Swartz 



Column long. Lip clawed. Connective not dilated. — Species 8. South 



Africa (Cape Colony). ....... Ceratandra EckU 



