20b. LABIATAE 473 



13J Style-apex entire or obscurely notched. Filaments free, unappendaged. 



Corolla-tube projecting beyond the calyx. 14 



Style-apex two-cleft or distinctly notched 15 



14. Upper Up of the calyx much enlarged and wrapped round the other teeth 



in the fruit. Corolla-tube slightly projecting. Disc almost equal- 

 sided. Shrubs. — Species 3. East Africa. . Erythrochlamys Guerke 

 Upper lip of the calyx not more enlarged in the fruit than the rest. Disc 

 one-sided. — Species 75. Tropical and South Africa. Some are used as 

 ornamental plants Orthosiphon Benth. 



15. Filaments of the lower pair of stamens united halfway up, all unappendaged. 



— Species 9. Central and South Africa. (Under Ocimum L. or 



Orthosiphon Benth.) Hemizygia Briq. 



Filaments free or the lower ones shortly united at the base ; the upper ones 

 usually kneed, toothed, or crested near the base. — Species 75. Tropical 

 and South Africa. Several species (especially 0. Basilicum L., sweet 

 basil) are used as pot-herbs, as medicinal or ornamental plants, as a 

 substitute for tea, and for preparing an essential oil. (Including Beciunt 

 Lindl.) . Ocimum L. 



16. Style-apex entire or nearly so. Filaments of the lower pair of stamens 



united nearly to the top. Corolla-tube exserted. Fruiting calyx sub- 

 equally 5-toothed. Shrubs. False whorls 2 — 6-flowered, spicately 

 arranged. Flowers medium-sized. — Species 7. South Africa. 



Syncolostemon E. Mey. 



Style-apex two-cleft. Filaments free. Herbs or undershrubs. False 



whorls 6 — many-flowered and spicately arranged, or collected in heads 



Flowers small 17 



17. False whorls arranged in dense heads. Calyx ovate-campanulate at the 



time of flowering ; fruiting calyx tubular, two-lipped, without transverse 

 ribs at the base. — Species 50. Tropical and South-east Africa. 



Acrocephalus Benth. 



False whorls arranged in spikes. Fruiting calyx ovate-campanulate, more 



rarely tubular, but then with transverse ribs at the base 18 



18. Fruiting calyx ovate-campanulate with a shortly 3-toothed upper lip and an 



entire lower Hp. False whorls 6 — lo-flowered. — Species 2. Central 



Africa Platostoma Beauv. 



Fruiting calyx with a 2 — 4-toothed lower lip or subequally 5-toothed. . 19 



19. Fruiting calyx tubular, usually transversely ribbed at the base. False 



whorls many-flowered. — Species 15. Tropical and South-east Africa. 



Geniosporum Wall, 

 Fruiting calyx ovate-campanulate. — Species 12. Tropical and South-east 

 Africa. {Basilicum Moench, including Iboza N. E. Brown) 



Moschosma Reichb. 



20. (9.) Lower lip of the corolla abruptly bent downwards, short, saccate, 



narrowed at the base. Stamens 4. Herbs. — Species 6, two of them 



