Small tree or shrub; infra-stipular prickles 2, short, recurved. Pinnæ 2-jugate; leaflets 1 pair per pinna, obovate-oblong or -rotundate. Spikes axillary, fascicled, white. Pod 2 in. long, flat, oblong. Red Sea Prov. (between Sinkat & Erkowit & Katai Geraite); Around Kassala & Gedaref routes; From Khartoum to Upper Nile Prov.; Blue Nile Prov. (Wad Medani to Sennar); Kordofan & Darfur Provinces. This tree, which grows gregariously, forms often most impenetrable thorny thickets. The fibre from the liber is largely used in making sacks to hold gum. =A. læta= _R. Br._ Small tree; prickles short, black, shining. Pinnæ 2-3 pairs; leaflets 3-5 pairs, oblanceolate, oblong. Spikes axillary, solitary or fascicled. Pod 2-3 in. long, flat, oblong, often once or twice constricted, coriaceous. Red Sea Prov. (J. Waratab, near Suakin); Fung Prov.; White Nile Prov. (Nyemati); Kordofan Prov. =A. albida= _Del._ HARAZ—Arab; SIRTU (J. Daier), NAGAN (Tagele), URĀD (Dilling & J. Ghulfan) & FORWEK (Kadugli)—Nuba. The largest of Sudan Acacias; branches whitish; spines short, straight. Flowers white, in spikes, which are axillary, solitary or in pairs. Pinnæ 4-6 pairs, with a gland between each pair; leaflets 7-17 pairs, oblong. Pod 2-5 in. long, flat, curved, often sinuous. Red Sea Prov. (Erkowit); From Dongola to Bahr El Ghazal Prov.; Blue Nile, Kordofan, Darfur & Mongalla Provinces. Wood white, liable to attacks of insects, used for boat-building. Pod fleshy, somewhat twisted, called KHARUMA by Arabs, good cattle fodder. =A. Suma= _Kurz._ KAKAMŪT & SINEIN—Arab; PANKAJA (Dilling)—Nuba; FIIT (Renk) & PAIT (Kaka)—Dinka; ODU—Hameg; NIARUD—Shilluk; NGWER—Nuer; VURRA—Zande. Small to moderate-sized tree with dark, fissured bark. Prickles broad- based, sharply recurved. Pinnæ 10-30 pairs, with a gland at the base of each pair and another below the first pair; leaflets 30-50 pairs. Flowers in pale-yellow spikes. Pods 3-4 in. long, crustaceous, brown when ripe. Fung, White Nile & Kordofan Provinces; Upper White Nile Prov. (Sobat River); Bahr El Ghazal Prov.; Mongalla Prov. Usually in more or less wet ground. Timber dark coloured, strong, used in making ploughs. The wood probably yields a Catechu. =A. hecatophylla= _Steud._ Tree, branches hoary-tomentose; prickles short, recurved. Pinnæ 10-30 pairs; leaflets 30-50 pairs, larger than in _A. Suma_, Kurz, oblong, obtuse. Flowering spikes white, solitary or fascicled. Pod oblong, obtuse, coriaceous, 7 in. long. Bahr El Jebel (Madi). =A. ataxacantha= _DC._ Small tree or shrub, with short, decurved, scattered prickles. Leaf- rachis with a raised gland near the base; pinnæ 7-15 pairs; leaflets 20-40 pairs, linear-subfalcate. Flower spikes dense, white, solitary or in pairs, axillary. Pod broad-linear, flat, papery. Bahr El Ghazal Prov. (Bongo-land: Sabbi); Darfur Prov. (Kulme). =A. macrostachya= _Reichenb._