474 206. LABIATAE 



only naturalized. Tropical and South-east Africa. Used medicinally ; 

 the seeds of one species yield oil. {Maesosphaerum P. Br.) [Subtribe 



HYPTiDiNAE.l Hyptis Jacq. 



Lower lip of the corolla not abruptly bent downwards, entire, exceeding the 

 upper lip. Upper lip 3 — 4-lobed or entire. [Subtribe plectran- 



THINAE.] 21 



21. Fertile stamens 2. Corolla whitish or violet. Fruiting calyx berry-like- 



Shrubs. False whorls 2 — 4-flowered. — Species i. Tropical and 



South-east Africa. The fruits are edible. , . . Hoslundia Vahl 



Fertile stamens 4. Fruiting calyx dry 22 



22. Filaments free 23 



Filaments united at the base into a closed tube or a sheath split behind. 27 



23. Fruiting calyx bursting by a circular slit near the base. — Species 50. 



Central and South Africa. Some species are used as ornamental plants. 



(Including Icomum Hua) Aeolanthus Mart. 



Fruiting calyx not bursting by a circular slit near the base 24 



24. Fruiting calyx tubular-elongate and curved or coiled, expanded at the base, 



constricted at the middle, subequally 5-toothed. Disc one-sided. Herbs 

 or undershrubs. — Species 3. Madagascar and South Africa. (Under 



Plectranthus L'Her.) Burnatastrum Briq. 



Fruiting calyx not tubular-elongate and curved 25 



25. Fruiting calyx bladdery-inflated, membranous, net -veined. Corolla pink ; 



upper lip almost entire. Disc equal-sided. False whorls many-flowered, 

 arranged in racemes. Shrubs. — Species i. Central Africa. 



Alvesia Welw. 

 Fruiting calyx not inflated 26 



26. Fruiting calyx with 5 subequal, subulate, rigid, almost spinous teeth. Disc 



almost equal-sided. Corolla blue or violet. False whorls arranged in 

 spikes. Herbs. — Species 40. Tropical and South-east Africa. 



Pycnostachys Hook. 

 Fruiting calyx with subequal but not rigid-subulate teeth, or two-lipped. 

 Disc one-sided. — Species 160. Tropical and South Africa. Some 

 species have edible tubers or serve as ornamental or medicinal plants or 

 for keeping off insects. (Including Germanea Lam. and Symphostemon 

 Welw.) (Plate 134.) Plectranthus L'Her. 



27. Staminal tube slit open behind. Herbs or undershrubs 28 



Staminal tube closed 31 



28. Calyx-lobes orbicular, much enlarged in the fruit, membranous, net-veined. 



Corolla-tube abruptly bent downwards ; upper lip entire. Disc almost 

 equal-sided. Style-apex 2-cleft. Stem ascending. Leaves fleshy. 

 False whorls 6-flowered, aggregated in panicled racemes. — Species i. 



East Africa Capitanya Schweinf. 



Calyx-lobes ovate or oblong, slightly enlarged in the fruit. Upper lip of the 

 corolla 4-toothed or 4-lobed. Stem erect. False whorls in lax racemes. 29 



