Fruit dehiscing in two straight and thin, not elastic valves, or indehiscent. Petals united to the middle or beyond.--Species 45. Tropical and South-east Africa; several species also cultivated in Egypt. Some species (especially _A. Lebbek_ Benth.) yield timber, tanners’ bark, gum, condiments, and medicaments, or serve as ornamental plants. (Including _Zygia_ Benth.) =Albizzia= Durazz. 28. (1.) Petals 1-6, the posterior one (the one next the placenta) inside of all in the bud, not forming a papilionaceous corolla, or wanting altogether. Embryo usually with a straight radicle. [Subfamily =CAESALPINIOIDEAE=.] 29 Petals 5, the posterior outside in bud, usually constituting a papilionaceous corolla. Sepals united below. Stamens 10, more rarely 5-9. Embryo usually with an inflexed radicle. Leaves simple, unifoliolate, digitate, or once pinnate. [Subfamily =PAPILIONATAE=.] 104 29. Calyx undivided or shortly lobed in the bud, usually more deeply divided at the time of flowering. 30 Calyx, already in the bud, divided down to the receptacle or nearly so. 39 30. Stamens 1-10. Corolla of 5 petals, nearly regular. Trees or shrubs. 31 Stamens 16 or more. Corolla of 6 petals, or of a single petal, or wanting. Calyx undivided in bud. Leaves imparipinnate or unifoliolate. Trees. [Tribe SWARTZIEAE.] 37 31. Leaves undivided, 2-lobed, 2-parted, or of 2 leaflets. [Tribe BAUHINIEAE.] 32 Leaves pinnate, with many leaflets. Stamens 10. 34 32. Ovary and fruit with a very long stalk, the fruit turgid. Ovules few. Style short. Stamens 10. Petals red. Calyx 5-lobed, imbricate in bud. Climbing shrubs. Leaves undivided, penninerved or faintly trinerved.--Species 3. West Africa. (_Bandeiraea_ Welw.) =Griffonia= Baill. Ovary and fruit with a short or rather short stalk, the fruit not turgid. 33 33. Receptacle (calyx-tube) very long. Petals yellowish. Stamens 10, partly sterile. Leaves undivided, ovate or elliptical. Racemes many-flowered.--Species 1. Madagascar. (Under _Bauhinia_ L.) =Gigasiphon= Drake Receptacle (calyx-tube) not very long.--Species 40. Tropical and South Africa, and Egypt. Some species yield timber, fibre, tanning and dyeing materials, edible roots, oily seeds, and medicaments, or serve as ornamental plants. (Plate 67.) =Bauhinia= L. 34. Leaves once pinnate, with a terminal leaflet. Calyx campanulate, subequally 5-lobed. Petals subequal, white or red. Ovules numerous. Fruit opening by two valves. Shrubs. Flowers solitary or in racemes.--Species 8. Madagascar and East Africa. =Cadia= Forsk. Leaves twice pinnate. [Tribe DIMORPHANDREAE.] 35 35. Ovary sessile or nearly so. Ovules 2. Style very short. Fruit with a thin, leathery rind, indehiscent. Seeds suborbicular. Flowers in spikes.--Species 2. Central Africa to Transvaal. They yield gum. =Burkea= Hook. Ovary stalked. Ovules more than 2. Fruit with a thick, leathery rind. Flowers in racemes. Trees. 36