470 205- VERBENACEAE — 2o6. LABIATAE 



Flowers 5 — 6-raerous. Calyxcleft halfway down, inflated in fruit. Stamens 

 inserted on the lower part of the corolla-tube. Fruit with a 4-celled 

 stone. Tall trees. Leaves entire. Cymes arranged in a terminal 

 panicle. — Species i {T. grandis L., teak). Cultivated in the tropics. 

 Yields valuable timber, tanning bark, oil, and medicaments. [Tribe 



TECTONEAE.] Tectona L.f. 



ai. Flowers solitary, axillary. Leaves undivided 22 



Flowers in cymes or inflorescences composed of cymes. Style-apex or 

 stigma 2-cleft 23 



22. Calyx 2-parted. Anthers included. Stigma entire. — Species 2. East 



Africa. [Under Holmskioldia Retz). . . . Cyclocheilon Oliv. 



Calyx 5-cleft. Anthers exserted. Stigma 2-parted. Pedicels partly 



transformed into spines. — Species i. Central and South Africa. (Under 



Clerodendron L.) Kalaharia Baill. 



23. Fruit with 2 two-celled or 4 one-celled stones. Anthers exserted. Corolla 



5-lobed. Leaves undivided or lobed. [Tribe CLERODENDREAE.] 24 

 Fruit with a single, 2 — 4-celled stone. [Tribe VITICEAE.] ... 25 



24. Calyx rotate ; tube very short, enclosing the fruit ; limb spreading, entire 



or obscurely lobed, coloured, much enlarged in fruit. Corolla with a 

 curved tube and an oblique limb. — Species 4. East Africa and Mada- 

 gascar. Used as ornamental plants. (Under Clerodendron L. or 



Cyclonema Höchst.) Holmskioldia Retz 



Calyx campanulate or tubular, not much enlarged in fruit. — Species 130. 

 Tropical and South Africa and Egypt. Some species are used as orna- 

 mental or medicinal plants. (Including Cyclonema Höchst, and Siphon- 

 antha L.) (Plate 133.) Clerodendron L. 



25. Corolla 4-lobed, small, white blue or greenish. Leaves undivided. — 



Species 20. Tropics. Some of them yield timber, condiments, or 



medicaments Premna L. 



Corolla 5-lobed. Calyx 5-toothed or 5-cleft 26 



26. Seeds with a membranous border. Fruit incompletely septate. Leaves 



undivided. — Species i. Madagascar Adelosa Baill. 



Seeds without a membranous border. Fruit completely septate. Leaves 

 usually compound with 3 — 7 leaflets. — Species 100. Some of them 

 yield timber, vegetables, edible fruits, or medicaments. Vitex L. 



FAMILY 206. LABIATAE 



Stem usually 4-angled. Branches and leaves opposite or whorled, very 

 rarely alternate. Leaves simple, without stipules. Flowers in cymose false- 

 whorls, usually more or less irregular. Calyx with open aestivation. Corolla 

 more or less distinctly two-lipped and 2 — 6-lobed, more rarely regularly 4-cleft, 

 imbricate in bud, the foremost lobe inside. Stamens 4, usually in two pairs of 

 unequal length, or 2, inserted on the corolla. Filaments usually free. Anthers 

 opening inwards by slits. Disc present. Ovary superior, 4-lobed or 4-parted^ 

 4-celled. Ovules solitary in each cell, basal, inverted, rarely lateral and half- 



