Rigid undershrub, 1-2 ft. high. Leaves opp. linear, fleshy, sessile, ¼-1 in. long; stipules sheathing, each with 2 bristles and adnate to the base of the leaves. Fl. small, sessile, or nearly so, solitary or few together, sheathed at base by a pale, calyx-like, 6-cleft involucre, in simple or alternately branched terminal spikes. Fruit dicoccous. Red Sea Prov. (Soturba). 507 =Spermacoce tenuissima= _Schwfth._ Very slender glabrous annual. Leaves opp., scabrous, sessile, narrow- linear, acute; stip. truncate and tipped with 1-4 bristles (setæ). Fl. 4-merous in small axillary and terminal sessile heads based by 2 pairs of leaves at right angles to each other; cor. purplish. Fr. dicoccous. Bahr El Ghazal Prov. (Jur Ghattas). =S. Phyteuma= _Schwfth._ Stiff hispid annual, 2 ft. high. Leaves scabrous, sessile, linear- lanceolate, 1-3 in. long. Fl. pale-purple in dense axillary and terminal heads based by 1-3 pairs of leaves. Fr. dicoccous. Bahr El Ghazal Prov. (Jur-land). =S. senensis= _Hiern._ Herb. Leaves opp., sessile, lanceolate or elliptical, with scabrous margins; stipules with hairy sheath and 5-7 setæ. Fl. white, ¼ in. long, in axillary sessile, verticillate heads based by 1-2 pairs of leaves. Capsule straw-coloured, ⅙ in. long. Fung Prov. (Saoleil); Upper White Nile Prov.; Bahr El Ghazal Prov. (Jur Ghattas). =S. hebecarpa= _Oliv._ Slender annual, 18 in. high; branches 4-angled. Leaves opp., sessile, linear, scabrid on the margins, 2 in. long; stip. with hairy sheath and 3-5 setæ. Fl. in axillary and terminal, sessile, leafy heads based by the dilated sheath of the stip. of 1-3 pairs of leaves. Fr. pubescent. Kassala Prov. (Gallabat); Bahr El Ghazal Prov. (Jur Ghattas). =var. major= _Schwfth._ More robust than type and up to 2 ft. high. Leaves up to 3 in. long. Bracteoles very numerous, longer than subulate calyx teeth. Kassala Prov. (Gallabat); Bahr El Ghazal Prov. (Jur Ghattas). =S. leucadea= _Hochst._ Erect annual with whitish hairs; stems and branches 4-angled. Leaves linear or lanceolate, sessile, scabrous, 1-2 in. long; stipules yellowish, with 5 bristles. Fl. small, 4-merous, in axillary and terminal, verticillate and capitate, leafy heads. Capsule ¼ in. long, hairy above. Kordofan Prov.; Mongalla Prov. (Mongalla). =S. radiata= _Sieber._ Hirsute annual, 1-2 ft. high. Leaves opp., sessile, linear, hispid on the midrib beneath, 2½ in. long; stip. with 7-9 slender bristles. Fl. small, white, in dense clusters, up to 1 in. diam., at the ends of stem and branches. Kordofan Prov. =S. Ruelliæ= _DC._ Hispid herb; branches 4-angled. Leaves opp., sessile, nearly linear, up to 3 in. long; stip. with 7 slender bristles. Fl. white, small, verticillate in axils and terminal; clusters sessile. Fr. dicoccous. Bahr El Ghazal Prov. (Jur Ghattas). =S. Kotschyana= _Oliv._