2I(). ACANTHACEAE 5O9 



Anterior filaments without an apical process. Ovary without glandular 

 pits at the top. Corolla-tube short-cylindrical. Fruit not or scarcely 

 contracted at the base 52 



52. Stigma with 2 almost equal lobes. Disc oblique. Seeds 3 — 4, glabrous. 



Spikes stalked. — Species 15. Some of them are used as ornamental or 



medicinal plants Acanthus L. 



Stigma with very unequal lobes or entire. Disc indistinct. Seeds bristly, 

 usually 2. Spikes sessile. Bracts ending in 3 — 5 spines. — Species 7. 

 South Africa Acanthopsis Harv. 



53. Calyx-segments unequal, the posterior much broader than the anterior, 



2-nerved, often toothed. Corolla red or yellow ; tube very long. 

 Anthers included. Seeds hairy. Bracteoles usualh' as long as the 

 calyx. — Species 17. Tropical and South Africa. Some are used as 



ornamental plants Crossandra Salisb. 



Catyx-segments subequal, the posterior as broad as or a little broader than 

 the anterior, one-nerved, rarely many-nerved and then sometimes 

 toothed. Anthers more or less exserted. Seeds not hairy. Bracteoles 

 shorter than the cal5'x 54 



54. Corolla-tube long. Anthers blunt. Disc thick. Fruit not contracted 



at the base. — Species 8. Tropics. (Including Butayea De Wild, and 

 PleuroUepharis BailL, under Sclerochiton Harv.) Pseudoblepharis Baill. 

 Corolla-tube short. Anthers pointed. Disc small. Fruit slightly con- 

 tracted at the base. — Species 4. Central and South Africa. 



Sclerochiton Harv. 



55. (48.) Corolla nearly regular, often obscurely two-lipped. Ovules 2 in 



each ovarj'-cell. Flowers in spikes, racemes, or panicles. ... 56 

 Corolla distinctly 2-lipped 64 



56. Fertile stamens 2. Staminodes usually present. Calyx 5-parted. [Tribe 



PSEUDERANTHEMEAE.] . . '. 57 



Fertile stamens 4 59 



57. Anthers i-celled. Calyx-segments subulate. Corolla-tube cylindrical, 



not widened above. Seeds i — 2, nearly smooth. Shrubs. Flowers in 

 panicles. — Species i. Northern East Africa (Somaliland). 



Ruspolia Lindau 

 Anthers 2-celled. Seeds 4, rarely fewer 58 



58. Corolla-tube funnel-shaped, much widened above. Seeds nearly smooth. 



Flowers in racemes, white. Shrubs. — Species i. Natal. Used as an 

 ornamental plant. (Under Asysfasia Blume). . . Mackaya Harv 

 Corolla-tube cylindrical, scarcely widened above. Seeds wrinkled. — 

 Species 12. Tropics. Some are used as ornamental plants. (Under 

 Eranthemum L.) Pseuderanthemum Radlk. 



59. Anthers i-celled, cohering. Fruit not contracted into a stalk. Flowers in 



spikes. — Species i. Madagascar. . . Stenandriopsis S. Moore 



Anthers 2-celled. Fruit contracted at the base into a long stalk. [Tribe 



ASYSTASIEAE.l 60 



