NOTE.—These two species of _Vahlia_ are often mistaken for species of _Oldenlandia_ in _Rubiaceæ_, but are at once distinguished by the free petals and absence of stipules. =DROSERACEÆ.= 69 =Drosera indica= _Linn._ Small herb. Leaves alternate, linear, the lower half glabrous, the upper part heavily fringed with gland-tipped tentacles. Flowers white; styles 3. Bahr El Ghazal Prov. (Niamniam-land: by the Gumango). =PODOSTEMONACEÆ.= 70 =Tristicha hypnoides= _Spreng._ Small moss-like herb, attached to boulders in streams or rivers. Leaves very minute. Flowers solitary, terminal, on peduncles, ¾ in. long in fruit; per. segments 3; st. 1; styles 2-3; caps. ellipsoid. South Kordofan Prov.; Nuba Mts. Prov. (J. Eliri); Bahr El Ghazal Prov. (Wau & Biri River, Mittu-land: Woko River near Kero). =ELATINACEÆ.= 71 =Bergia verticillata= _Willd._ Glabrous procumbent herb, about 1 ft. high, aquatic; stems succulent, pink. Leaves nearly sessile, lanceolate, tapering at both ends, 1 to 1½ in. long, opposite, stipulate. Flowers crowded in axillary, sub- verticillate fascicles; stamens 10. Kordofan Prov. =B. suffruticosa= _Fenzl._ MIRMID or MIREMIT (Khartoum), RIMITH—Arab; OKRIT—Hadendowa; SITA—Rashida. Deep rooted, heather-like undershrub, rooting again where branches touch the ground. Bark deciduous in papery rust-coloured flakes. Kassala Prov. (Gallabat); Dongola, Berber, Khartoum, White Nile & Kordofan Provinces. =B. ammanoides= _Roth._ RIMÏTH (N. Kordn.)—Arab. Herb under 1 ft. high. Leaves oblanceolate, pilose. Flowers in dense axillary, sub-verticillate fascicles; stamens 3. Kordofan Prov. =CARYOPHYLLACEÆ.= 72 =Silene Macrosolen= _Steud._ Somewhat viscid perennial, branching from the base. Flowers pinkish in forking panicles. Calyx 5-toothed, narrow tubular, up to 1½ in. long, teeth short; petals much exserted, 5. Carpophore much longer than capsule; styles 3. Darfur Prov. (J. Marra, 6,500-9,300 ft.). 73 =Cerastium vulgatum= _Linn._ Downy, somewhat viscid annual, branching at the base. Stem leaves sessile, oblong to ovate. Flowers white in terminal cymes. Petals shorter or hardly longer than sepals; styles 5; sepals free. Darfur Prov. (J. Marra, 8,600 ft.). 74 =Arenaria Schimperi= _Hochst._ Procumbent diffuse perennial. Leaves subulate, ¼ to ½ in. long. Flowers in loose forking cymes, white; sepals 5, free, 3-nerved; petals 5, equal to sepals; styles 3; capsule 3-valved. Darfur Prov. (J. Marra, above 9,000 ft.). 75 =Spergula arvensis= _Linn._ Slender herbs. Leaves linear, in opposite clusters, appearing whorled. Flowers small, white, in terminal forked cymes; stamens 5 or 10; styles 5. Red Sea Prov. (21° N. Lat., from sea level to 4,000 ft.). 76 =Polycarpon memphiticum= _Fenzl._