Low, straggly herb. Leaves linear, acute, about ½ in. long, Flowers very small, clustered and sessile at the nodes. Calyx lobes setose. Nubia; Blue Nile Prov.; Kordofan Prov.; Bahr El Ghazal Prov. (Wau & Nianniam-land). =O. capensis= _Linn._ Herb, 4-9 in. high; branches 4-angled. Leaves narrow-linear, revolute. Peduncles 2 to several together, 1-flowered, axillary or terminal; cor. white, slightly longer than calyx. Capsule minute, 4-ribbed. Kordofan Prov.; Bahr El Ghazal Prov. =O. wauensis= _Schwfth._ Glabrous herb, 1 ft. high; branches with 4 raised lines. Leaves linear; stipules sheathing, with many bristles. Flowers mostly pentamerous, in pairs, small. Capsule coriaceous, oblong, small. Bahr El Ghazal Prov. (Wau River). =O. Heynei= _Oliv._ Herb, 1-2 ft. high. Leaves linear-lanceolate. Lower flowers solitary, upper in a paniculate cyme. Cor. salver-shaped; tube slender, glabrous within, twice the length of calyx. Fruit subglobose. Fung Prov. (Roseires); Kordofan Prov.; Bahr El Ghazal Prov. (Jur Ghattas & Niamniam-land). =O. effusa= _Oliv._ Tall herb. Leaves narrow-linear, revolute. Flowers 4-merous, lilac, in paniculate cymes. Fruit globose. Khartoum Prov.; Blue Nile Prov. (Rufaa). =O. cf. O. effusa= _Oliv._ Almost leafless herb with weak branches. Flowers pale red outside; corolla very slender, ¾ in. long, with 4 linear very acute lobes, fruits 1/10 in. long. Kordofan Prov. (Um Dam, 1,245 S.G.H.). =O. sp.= Leafy much-branched herb. Leaves linear-oblanceolate acute, 1½ in. long, shortly pubescent. Corolla ¼ in. long, with 4 short obtuse lobes. Mongalla Prov. (Sheikh Tombé, 1,648 S.G.H.). =O. noctiflora= _Hiern._ Glabrous annual. Leaves linear. Flowers white, opening at night. Red Sea Prov. =O. hedyotoides= _Boiss._ Herb, 6 in. to 1 ft. high. Leaves linear-oval. Flowers minute, clustered in axils of the leaves; cor. white. Capsule coriaceous, 4-ribbed. Blue Nile, Kordofan & Bahr El Ghazal Provinces. =O. dolichantha= _Stapf._ Slender herb with subsimple stems. Leaves lanceolate, acute, sessile, about 1¾ in. long, glabrous. Flowers white, sweet-scented. Corolla very long, up to 5 in. long, very slender. Mongalla Prov. (Yei River); Bahr El Ghazal Prov. (Niamniam-land). 474 =Mussænda luteola= _Del._ Shrub. One lobe of calyx enlarged into a yellow leaf. Cor. 5-lobed, yellow, fragrant. Fung Prov. (Singa); White Nile Prov.; Bahr El Ghazal Prov. (Mittu-land: near M’volo & Niamniam-land); Upper Sobat; Mongalla Prov. (south of Gondokoro); Lake Rudolf. =M. arcuata= _Poir._ Climbing shrub. One lobe of calyx enlarged into a white leaf. Cor. 5-lobed, yellow with purplish or orange, hairy throat. Bahr El Ghazal Prov. (Jur, Niamniam & Bongo lands); Mongalla Prov. (Yei River District). =M. erythrophylla= _Schum._ & _Thonn._ Shrub or climber. One lobe of calyx enlarged into a red leaf. Cor. white or yellowish, tube densely reddish-hairy. Bahr El Ghazal Prov. (Niamniam-land). A handsome decorative plant.