105. LEGUMINOSAE 247 



19. (9.) Flowers in beads. Ovary sessile, with many ovules. Fruit trans- 



versely 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 



Flowers short-stalked 23 



21. Calyx saucer-shaped, cleft to the middle. Petals free. Disc cupular^ 



thick. Fruit large, elUptical, i-celled. Seeds winged, with a long 



funicle. Trees. Leaves with 1—2 pairs of pinnae. Spikes panicled. — 



Species i. Equatorial West Africa. Yields timber. Fillaeopsis Harms 



Calyx bell-shaped, shortly toothed. Disc inconspicuous or wanting . 22 



22. Petals obviously united below. Fruit i-celled, opening in two valves. — 



Species 13. Tropics to Delagoa Bay. Some species yield ebony-like 



wood Piptadenia Benth. 



Petals free or nearly so. Fruit with thick, persistent sutures, the valves 

 splitting transversely into one-seeded joints. Endocarp separating 

 from the exocarp and persisting round the seeds. Shrubs. — Species 10. 

 Tropical and South Africa. Some species (especially E. scandens L. 

 with fruits attaining a yard in length) yield soap-bark, fibre, vegetables, 

 fish-poison, and edible oily seeds which are also used in medicine and as 

 ornaments. {Gigalobium P.Br., Pusaetha L.) . . Entada Adans. 



23. Disc cupular, thin. Ovary stalked. Seeds winged. Trees. Leaves 



with one pair of pinnae. Flowers with a very short stalk. — Species i. 

 Equatorial West Africa. Yields timber. (Including Cvrtoxiphus Harms) 



Cylicodiscus Harms 



Disc inconspicuous or wanting. Ovary sessile or nearly so. Shrubs. 



Leaves with 3 — 12 pairs of pinnae 24 



24. Calyx-teeth more or less unequal. Buds oblique. Fruit woody, trans- 



versely septate, opening in two valves. Leaves with 3—6 jiairs of pinnae. 



— Species I. German East Africa. . . . Pseudoprosopis Harms 

 Calyx-teeth equal. Fruit leathery, with persistent sutures, the endocarp 



separating from the exocarp. Leaves with 6 — 12 pairs of pinnae. — 

 Species 5. South Africa and southern Central Africa. They 3äeld 

 fish-poison and are used in medicine . . Elephantorrhiza Benth. 



25. (4.) Filaments free or the inner united into a ring. Petals white or yellow 



— Species 80. They yield timber, fibre, soap-bark, gum (especially 

 from A. Senegal Willd., Verek), tanning and dyeing materials, perfumes, 

 oil, and medicaments ; some are used as ornamental plants. (Including 

 Vachellia Arn.) [Tribe ACACIEAE.] .... Acacia Willd. 



Filaments united into a tube, at least at the base. Petals white or red. 



Flowers in heads. Unarmed plants. [Tribe INGEAE.l ... 26 



2b. Fruit strongly curved or coiled, thick, leathery, separating into one-seeded 



joints or indehiscent. Petals imited beyond the middle. Trees. — 



