White Nile Prov. (banks of the River: Tawila, Kosti (Khors), Abba Island & near J. Nyemati). 731 =Burnatia enneandra= _Micheli._ Marsh herb. Leaves radical; pet. 5-16 in. long; blade lin. to lanc., 5-8 in. long. Scape longer than leaves; infl. diœcious; panicles verticillately branched; male pan. 12-16 in. long, fem. 8-10. Male fl.: sep. 3; pet. 3, small: sta. 9; rudimentary carpels 12. Fem. fl.: sep. 3; pet. 0; sta. 0, or 1-2 imperfect; carpels ab. 12 crowded on small receptacle, compressed. Fung Prov. (Jongol’s Post), White Nile Prov. (J. Arashkol); Bahr El Ghazal Prov. (Jur: Jur Ghattas). 732 =Wisneria Schweinfurthii= _Hook. f._ Marsh herb. Leaves radical; pet. sheathing at base, 9 in. long; blade oblong or oblanc., up to 6 in. long. Scape as long as leaves, bracts united into truncate membranous campanulate sheaths; male fl. in upper part of scape, fem. below. Male fl.: sep. 3; sta. 3; fem. fl.: sep. 3; carpels 3-6 ovoid. Pet. 0. Bahr El Ghazal Prov. (Bongo: Gir; Jur: Jur Ghattas). =BUTOMACEÆ.= 733 =Butomopsis lanceolata= _Kunth._ Marsh herb with milky juice. Leaves radical; pet. up to 10 in.; blade ovate, tapering into pet., up to 4 in. long. Scape longer than leaves, in umbellate ab. 6-flowered cyme; pedicels up to 4 in. long in fruit. Fl. hermaphr.; sep. 3; pet. 3, white, fugacious; sta. 9 or fewer; carpels usually six, follicled in fr. White Nile Prov. (J. Arashkol & Um Kinein). =APONOGETONACEÆ.= 734 =Aponogeton subconjugatus= _Schumacher_ & _Thonn._ Submerged water plant. Leaves long-stalked, elongate-oblong, often speckled brown, blade 5-12 in. long. Scape bearing a bifid spike which is ab. 1½ in. long; young flowers enclosed in a glove-finger-like sheath, separating from the base. Fl. hermaphr.; sep. 1-3; sta. 6; carpels 3-5, usually 4. Mongalla Prov. (Bor). =A. vallisnerioides= _Baker._ Submerged plant, densely tufted. Leaves sessile, strap-shaped, 3-4 in. long. Spikes simple, dense flowered, sheathed as above. Bahr El Ghazal Prov. (Jur: Kutshuk Ali’s Zariba & Jur Ghattas; Bongo: Gir & Dumuku). =POTAMOGETONACEÆ.= 735 =Potamogeton Schweinfurthii= _Arth. Bennett._ Submerged plant; stems ab. 2 ft. long, branched. Lower leaves lin.-lanc., acute, 3-4 in. long, 5-nerved; middle leaves lanc., 11-nerved, ab. 3 in. long; upper leaves floating, lanceolate to lanc.-ovate, 10-13 nerved, 2-3 in. long; pet. 2-3½ in. long; stip. 1-2 in. long. Ped. axillary, 4-6 in. long, base enclosed in a membranous spathe; spike 1-2 in. long, dense. Per. segm. 4, green; anthers 4, sessile; carpels 4, 1-celled; fr. sharply 3-keeled. Bahr El Ghazal Prov. (main river: Nuer villages, mouth of Bahr El Arab). =P. javanicus= _Hassk._