U. iklDACEA^. 67. 



Tuber fleshy subterranean. 1 DIOSCOREA. 



Tuber large, firm, half exposed. 2 TESTUDINARIA. 



1. DIOSCOREA L. (In Bush.) 



1. crinita Hk.f. Coast and Midlands. 



2. diversifolia Griesb. Midlands and Drakensberg. 



3. dregeana Baker. Coast and Drakensberg. 



4. malifoiia Baker. Coast and Midlands. "inTana." 



5. microcuspis Baker. Near Newcastle, 3-4,000 ft. 



6. mutiloba Kth. Coast and Midlands. 



7. rupicola Kth. Inanda. "mKwa." 



8. undatiloba Baker. 



2. TESTUDINARIA Salisb 



1. elephantipes Burch. Rocky hill, South Downs. 



2. sylvatica Kth. Coast and Midlands. 



FAMILY 24— IRIDACEAE. 



Herbs rarely undershrubs. Inflorescence terminal. Flowers 

 hermaphrodite. Perianth segments 6. Stamens 3 opposite outer 

 perianth segments. Ovary inferior 3 celled. Style branches 3 

 often divided or dilated. Fruit a capsule. Endosperm horny. 

 16 genera 83 species. 



1. Style branches petaloid with stamens opposite and adpressed 



to them. 2. 



Style branches not petaloid. Stamens not adpressed to them. 3. 



2. Style branches large with stigmas on underside. Inner and 



outer perianth segments unequal. 1 MORAEA. 



Style branches small with stigmas at tip. Inner and outer 



perianth segments subequal. 2 HOMERIA. 



3. Flowers more than 1 to a spathe fugitive often appearing in 



succession. 4. 



Spathes 1 flowered, not fugitive. 5. 



4. Flowers pale yellow. Style branches long subulate. 



4 BOBARTIA. 

 Style branches short. Flowers usually bluish. 5 ARISTEA. 



5. Style branches bifid. 6. 

 Style branches undivided. 8. 



6. Filaments long, inserted below throat of perianth tube. 



11 WATSONIA. 

 Filaments short, inserted at the throat of perianth tube. 



7. Flowers solitary terminal. 3 ROMULEA. 

 Flowers not solitary. 10 LAPEYROUSEA. 



8. Flowers regular' or nearly so. Stamens and style straight. 9. 

 Flowers more or less irregular. Stamens unilateral curved. l2. 



9. Style long, branches short, club-shaped or linear. 10. 

 Style short, branches long, subulate. 11. 



10. Spathe valves both membranous entire. 9 DIERAMA. 



