Shrub. Leaves 4-6 in. long, elliptic, with 5-parallel nerves, opposite. Flowers solitary or 2 together, 5-merous, pink or purple, enclosed in leafy bracts, anthers 8-10, some longer, incurved, connective produced, as long as anther-cells. Capsule 5-valved, with a minute ring of bristles. Bahr El Jebel (Madi); Bahr El Ghazal Prov. (Jur Ghattas). =D. capitata= (_Vahl_) _Hook. f._ =var. Barteri= _Hook. f._ Small shrub, scabrid, 4-angled. Leaves 3-5 in. long, opposite, 5-7 parallel-nerved. Flowers in small bracteate heads; stamens and capsule as above. Bahr El Ghazal Prov. (Khor Tela: between Tonj & Wau). =D. phæotricha= _Triana._ (_Osbeckia postpluvialis_ Gilg). Hispid herb, 6-8 in. high, 4-angled. Leaves 2 in. long, oblong with 3-5 parallel nerves. Flowers 4-merous, capitate; bracts small, pectinate, with bristles; calyx bristly; petals purple, obovate; anthers of 2 lengths; connective short, 2-fid, shorter; stamens 2-tubercled at base. Capsule as above. Bahr El Ghazal Prov. (Bongo-land: near Kulengo, Jur Ghattas). =D. rotundifolia= ex _Gilg._ (_D. prostrata_ Triana). Herb. Leaves ovate, 3-nerved, about 1¼ in. long, ¾ in. broad, slightly pubescent. Flowers few, rose; calyx lobes lanceolate, acute, ⅓ in. long. Fruits nearly glabrous, ⅓ in. long, calyx persistent. Bahr El Ghazal Prov. (Niamniam-land: by the Atazilli). =D. Schweinfurthii= _Gilg._ Bushy plant, 4 ft. high. Leaves oblong-lanceolate, obtuse, 1½-3 in. long, ¾-1 in. broad, hispidulous, 5-nerved. Flowers with 2 large bracts at the base, mauve; calyx densely covered with very hairy bristles; smaller lobes between the calyx lobes. Mongalla Prov. (Yei River). =D. scabra= _Gilg._ Herb, 3-4 ft., stems subquadrangular. Leaves ovate-lanceolate, 4 in. long, 1½-2 in. broad, scabrid above, scabrid-puberulous below. Flowers in terminal cymes. Calyx with numerous disk-like processes outside, setose. Bahr El Ghazal Prov. (Bongo-land: between Tonj & Duguru & Niamniam-land: Kulensho). 187 =Tristemma roseum= _Gilg._ Branchlets slender, glabrous. Leaves elliptic, acute, 2½ in. long, 1 in. broad, slightly setulose. Involucres sessile. Receptacle glabrous. Calyx lobes obtuse. Flowers rose. Belgian Congo (Niamniam-land: by the Assika River). =T. Incompletum= _R. Br._ Erect, bristly shrub; branches 4-angled. Leaves opposite, elliptic to lanceolate, 4-6 in. long, 5-7 nerved, hairy. Flowers capitate, enclosed in broad, hairy bracts. Receptacle with a single ring of bristles. Petals ¼ in., white or pink; stamens 10, mostly equal, with 1 pore, 2-tubercled; crown of ovary bristly. Fruit dry. Bahr El Ghazal Prov. (Niamniam-land: by the Nabambisso River); Mongalla Prov. (Yei River). =T. papillosum= _Gilg._ Erect shrub, bristly; branches 4-angled. Leaves opposite, elliptic to lanceolate, 4-6 in. long, 5-7 nerved, hairy. Flowers capitate, enclosed in leafy bracts. Receptacle quite glabrous. Bahr El Ghazal Prov. (Jur Ghattas). =T. grandifolium= _Gilg._