Fruit narrowly linear. Seeds placed obliquely or longitudinally.--Species 7. One of them naturalized in the Tropics, the others natives of Madagascar. Seeds used as ornament. (_Acuan_ Medik.) =Desmanthus= Willd. 9. Seeds albuminous. [Tribe ADENANTHEREAE.] 10 Seeds exalbuminous. [Tribe PIPTADENIEAE.] 19 10. Flowers in heads. 11 Flowers in spikes or racemes. 12 11. Flowers partly (the upper) hermaphrodite, partly (the lower) male or neuter. Ovary stalked. Ovules numerous. Fruit obliquely-oblong, opening by two valves. Herbs or undershrubs. Stipules membranous, cordate.--Species 1. Tropics. Used as a vegetable. =Neptunia= Lour. Flowers all hermaphrodite. Ovary sessile. Ovules 1-2. Fruit sickle-shaped, indehiscent. Shrubs. Stipules spinous, recurved.--Species 1. South Africa. =Xerocladia= Harv. 12. Flowers partly (the upper) hermaphrodite and yellow, partly (the lower) neuter and white or red. Fruit not winged. Shrubs or trees.--Species 12. Tropical and South Africa. Some species yield ebony-like wood and medicaments. (_Cailliea_ Guill. & Perr.) =Dichrostachys= DC. Flowers partly hermaphrodite, partly male or female, or all hermaphrodite; no neuter flowers. Trees. 13 13. Fruit winged or distinctly 4-angled, transversely septate, indehiscent. 14 Fruit neither winged nor distinctly 4-angled. 16 14. Fruit 2-winged. Ovary stalked. Flowers sessile.--Species 1. Madagascar and Mauritius. =Gagnebina= DC. Fruit 4-winged or 4-angled. Ovary sessile or nearly so. Flowers stalked. 15 15. Fruit 4-winged.--Species 3. Central Africa. They yield timber, a substitute for soap, poison, and medicaments. =Tetrapleura= Benth. Fruit 4-angled. Leaves with 4-5 pairs of pinnae.--Species 1. Central Africa. =Amblygonocarpus= Harms 16. Fruit distinctly dehiscing in two valves. 17 Fruit indehiscent. 18 17. Seeds few, very flat, winged, with a long funicle.--Species 3. Equatorial West Africa. =Newtonia= Baill. Seeds numerous, thick, red. Leaflets numerous.--Species 1 (_A. pavonina_ L.). Naturalized in the tropics. It yields timber, gum, dyes, medicaments, and edible oily seeds, which are also used as ornaments. =Adenanthera= L. 18. Calyx large, tube-or urn-shaped, with ovate, acute teeth. Stamens inserted at the base of the petals. Leaves with one pair of pinnae and several pairs of very large oblong leaflets. Spikes arranged in panicles.--Species 1. Equatorial West Africa (Cameroons). Yields timber and medicaments. =Calpocalyx= Harms Calyx small, bell-shaped, with short segments. Stamens free. Leaves with 2-5 pairs of pinnae and small or rather small leaflets.--Species 3. North and Central Africa. They yield timber and edible fruits. (Including _Anonychium_ Benth.) =Prosopis= L. 19. (9.) Flowers in heads. Ovary sessile, with many ovules. Fruit transversely septate. Trees.--Species 5. Tropics. They yield timber and a substitute for soap. (Under _Parkia_ R.Br.) =Xylia= Benth. Flowers in spikes or racemes. Shrubs or trees. 20 20. Flowers sessile. 21