508 216. ACANTHACEAE 



white. Anthers with equal halves. Ovary hairy above. Ovules 2 in 

 each cell. Stigma unequally 2-lobed. — Species i. Madagascar. 



Warpuria Stapf 

 Bracteoles minute or absent 45 



45. Flowers solitary, axillary. Stamens approximate in pairs. Anthers all 



2-celled. Stigma with two almost equal lobes. — Species 2. South 



Africa Glossochilus Nees 



Flowers in spike- or head-Hke inflorescences. Stigma entire or very 

 unequally 2-lobed, rarely almost equally 2-lobed, but then anthers 

 partly i-celled 46 



46. Stamens approximate in pairs. Anther-halves unappendaged, inserted 



nearly at the same level. Calyx-teeth pointed. Ovary and style 

 glabrous. Ovules 2 — 4 in each ovary-cell. Fruit narrow-oblong, 

 4 — S-seeded. Inflorescence capitate. - — Species 10. South and Central 



Africa Crabbea Harv. 



Stamens not approximate in pairs. Anthers all with one half inserted 

 lower than the other, or the posterior with one half only developed. 

 Ovules I — 2 in each ovary-cell. Fruit 2- — 4-seeded 47 



47. Anterior calyx-segments united halfway up. Corolla violet. Anthers 



of the anterior stamens with unappendaged halves inserted at the same 

 level ; those of the posterior stamens with one half only developed. 

 Stigma with 2 minute, subequal lobes. Flowers in few-flowered spikes. 

 — Species t. Northern East Africa (Somaliland). Lindauea Rendle 

 Anterior calyx-segments nearly free. Anthers of all or only the anterior 

 stamens with one half inserted lower than the other. Stigma entire. — 

 Species 30. Central Africa. (Including Volkensiophyton Lindau). 



Lepidagathis Willd. 



48. (40.) Corolla I -lipped, 3 — 5-lobed ; in place of the upper lip a slit. 



Stamens 4. Anthers i-celled. Ovules i — 2 in each ovary-cell. Flowers 



in spikes. [Tribe ACANTHEAE.] 49 



Corolla 2-hpped or nearly regular 55 



49. Calyx 4-parted. Corolla white or blue, rarely yellow ; tube short. Leaves 



usually prickly 50 



Calyx 5-part cd. Leaves undivided 53 



50. Corolla-tube of moderate length. Sepals free. Filaments very short. 



Bracts small ; bracteoles much larger. Leaves undivided. — Species i. 

 Equatorial East Africa (Uganda). . . . Crossandrella C. B. Clarke 

 Corolla-tube very short. Bracts large, imbricate, usually prickly ; bract- 

 eoles small and narrow or wanting 51 



51. Anterior filaments with a process near the top. Ovary with two glandular 



pits at the apex. Stigma-lobes 2, equal. Corolla-tube nearly globular. 

 Fruit more or less contracted at the base. Seeds hairy. — Species 60. 

 Tropical and South Africa and Egypt. Some are used as vegetables or 

 in medicine ; others are noxious weeds Blepharis Juss. 



