Pubescent perennial. Leaves ovate, 3-4 in. long, crenate, densely hairy beneath. Racemes dense, panicled, up to 9 in. long; bracts ovate, deciduous; calyx ¼ in. long; cor. ab. ¼ in. long, white, tinged purple. Bahr El Ghazal Prov. (Mittu-land: between Kero & Ngama). =O. menthæfolium= _Hochst._ HADANIT—Hadendowa. Perennial very like _O. canum_. Leaves oblong or oblong-lanceolate, 1-1½ in. long. Calyx ⅛ in. and cor. ¼ in. long. Red Sea Prov. (Suakin, Khor Tamanib); Kordofan Prov. (J. Kurbaj & Obeid); Darfur Prov. (Kulme & 40 miles West of El Fasher); Bahr El Ghazal Prov. (Wau). =O. citriodorum= _Vis._ Undershrub; stems pubescent. Leaves ovate-lanceolate, crenate. Racemes lax, simple; bracts shortly petioled, ciliate; calyx hairy, upper lobe orbicular, lateral ovate, lower lanceolate, subulate; cor. blue-violet, longer than calyx, small; filaments of upper st. with tuft of hairs at base. Nubia; Khartoum Prov. =O. Johnstonii= _Baker._ Tall, bushy, fragrant herb. Leaves ovate, deeply crenate, ab. 1½ in. long. Calyx ⅛ in. and cor. ¼ in. long; upper filaments of st. with basal tufts of hairs. Khartoum, cultivated. =O. dichotomum= _Hochst._ Erect branched annual. Leaves oblong-lanceolate, 1-1½ in. long. Racemes long, lax; bracts small; calyx tube campanulate in fruit, ⅙ in. long; cor. a little longer than calyx; st. filaments unappendaged at base. White Nile Prov. (J. Arashkol); Kordofan Prov. 702 =Platystoma africanum= _P. Beauv._ Erect annual, 1-2 ft. high. Leaves ovate, 1-2 in. long, crenate, pubescent. Racemes fairly dense, 3-6 in. long, whorls 10-flowered; pedicels deflexed in fruit; calyx lobes 2, toothed; cor. pale lilac, minute, bilabiate, upper lip 4-toothed, lower entire; st. 4, declinate, filaments dilated at base. Bahr El Ghazal Prov. (Gir & Jur). 703 =Acrocephalus Schweinfurthii= _Briquet._ Tall herb with grey appressed hairs. Leaves linear, 1-2 in. long, narrowed at each end. Fl. in globose, corymbose heads, ⅓ in. diam.; basal bracts ovate-lanceolate, tipped blue-purple; calyx minute; cor. small, 2-lipped, upper lip 4-lobed; st. 4, didynamous, exserted, filaments unappendaged. Bahr El Ghazal Prov. (Jur: Jur Aweit & Agada). =A. lilacinus= _Oliv._ Hairy perennial, 2-3 ft. high. Leaves whorled, lin.-lanceolate, 1-1½ in. long, denticulate. Heads in dense, terminal corymbs; basal bracts ovate, yellowish, upper orbicular, cuneate, cuspidate, greenish, ⅛ in. long; cor. pale-lilac, nearly ½ in. long. Bahr El Ghazal Prov. (Bongo: Sabbi River). =A. Heudelotii= _Briquet._ Pubescent perennial, 1½-2 ft. high. Leaves whorled, linear, 1½-2 in. long. Heads globose corymbose; basal bracts linear, foliaceous, upper obovate-cuneate, pale, hairy, ⅛ in. long; cor. twice as long as calyx, pale violet. Bahr El Ghazal Prov. (Jur: Agada near Jur Ghattas & Jur Aweit). 704 =Moschosma polystachyum= _Benth._