514 2IÖ. ACANTHACEAE 



97. Bracts very small, shorter than the calyx. Calyx-segments nearly free, 



3-nerved. Stamens inserted at the throat of the corolla. Partition 

 of the fruit not separating from the valves. — Species 5. Central 



Africa Anisotes Nees 



Bracts large, as long as or longer than the calyx. Stamens inserted in 

 the corolla-tube. Partition of the fruit separating from the valves at 

 maturity. — Species 5. Tropical Africa to Transvaal. [Macrorungia 

 C. B. Clarke) Himantochilus T. Anders. 



98. Bracts small. Anther-halves inserted at slightly unequal heights. Fruit 



oblong, narrowed into a long stalk. Shrubs, usually climbing. Flowers 

 in panicles. — Species 6. Tropical and South Africa. Some are used as 



ornamental or medicinal plants Rhinacanthus Nees 



Bracts large. Fruit narrowed into a short stalk. Herbs 99 



99. Bracts not opposite in pairs. Corolla small. Anther-halves inserted at 



slightty unequal heights. Pollen-grains globose, with 6 pores and 

 several longitudinal rows of raised dots. — Species 3. Equatorial 



West Africa Chlamydocardia Lindau 



Bracts opposite in pairs and usually united at the base, enclosing i — 2 

 flowers. Pollen-grains ovoid, smooth, with 3 pores and 3 bands. . 100 



100. Stamens inserted at the throat of the corolla. Fruit oblong ; partition 



not separating from the valves. — Species 10. Tropical and South 

 Africa. Some are used as ornamental or medicinal plants. 



Peristrophe Nees 



Stamens inserted in the corolla-tube. Fruit ovate ; partition separating 

 from the valves at maturity. — Species 30. Tropical and South Africa. 



(Diapedium Koenig) Dicliptera Juss. 



loi. (80.) Corolla-tube much widened above, long, curved ; lower lip rolled 

 in. Stamens inserted at the throat of the corolla. Shrubs. Flowers 

 in long terminal spikes or racemes, reddish-yellow. Bracts and bracte- 

 oles very small. — Species i. Island of Socotra. {Ancalanthus Balf. 

 fil.) Angkalanthus Balf. fil. 



Corolla-tube not or slightly widened above. Stamens inserted in the 

 corolla-tube. Bracts not very small 102 



102. Corolla-tube rather short, about equalling the limb. Seeds usually 2. 



Inflorescence spike-like. Bracts large. Bracteoles small or wanting. 103 

 Corolla-tube long. Fruit contracted into a long stalk 104 



103. Flowers sohtary in the axil of each bract. Bracteoles linear. Fruit 



subglobose, contracted into a short stalk. — Species 5. Central Africa. 



(Under Echolium Kurz) Schwabea Endl. 



Flowers 2 — 3 in the axil of each bract. Bracteoles bristle-like or wanting. 

 Shrubs. — Species 3. Central Africa. (Under Dicliptera Juss.) 



Megalochlamys Lindau 



104. Bracts broad. Bracteoles long. Fruit flat. Seeds 2. Shrubs. Flowers 



in spikes. — Species 15. Tropical and South Africa. Some are used 



