Wolffia.] CLI. LEMNACEiE (bROWN). 205 



Mozamb. Bist. German East Africa : Ugogo ; Ngangadra, Stuhlmann (er 

 Hegelmaier). 



Also in Lower Egypt. 



3.. "W. Welwitschii, Herjelmaier in Journ. Bot. 18 Of), 114. 

 Frond small, 2-3 lin. long, 1-2 lin. broad, oblong, broadly or sub- 

 truncately rounded at the ends, undulated or with one or more folds 

 along each side, entire, very thin, almost membranous in the dried 

 state, pale green, pellucid. Flowers in two cavities on the upper 

 surface of the frond near the basal end on either side of the middle 

 line, very minute ; ovary flask-shaped. Fruit about \ lin. long, ellip- 

 soid, smooth. — Hegelmaier, Monogr. Lemn. 130, t. 4, figs. 1-10, and 

 in Engl. Jahrb. xxi. 300 ;• Engl, and Prantl, Pflanzenfam. ii. iii. 164 and 

 160, fig. 105, C ; Durand & Schinz, Conspect. Fl. Afr. v. 485 ; Rendle in 

 Cat. Afr. PI. Welw.* ii. 92. W. conguensis, Welw. ex Trimen in Journ 

 Bot. 1866, 221. 



Iiower Guinea. Angola : Ambriz ; in the lakes of Quizembo, and in lakes 

 and stagnant pools not far from the sea, between Ambriz and the mouth of the River 

 Congo, Welwitsch, 209 ! 



Also in Venezuela and Cuba. 



Welwitsch appears not to have seen fruit of this species, but I have found a 

 specimen with fruit among the very small quantity examined. 



4. W. Michelii, Schleid. Beitr. Bot. 233. Frond minute, \-\ lin. 

 long, about \ lin. broad, elliptic or orbicular in outline, nearly as thick 

 as broad, rather dark green. Flowers very rarely. — N. E. Br. in Dyer, 

 Fl. Cap. vii. 40; Rendle in Cat. Afr. PI. Welw. ii. 92. IF. aiv^hiza, 

 Wimm. Fl. Schles. ed. 3, 140; Journ. Bot. 1865, 113, t. 29; Hegel- 

 maier, Monogr. Lemn. 124, and in Engl. Jahrb. xxi. 301 ; Engl. &: 

 Prantl, Pflanzenfam. ii. iii. 164, 154, fig. 101, D-E, 157, fig. 103, 160, 

 fig. 105, A, and 106, E-F ; Durand & Schinz, Conspect. Fl. Afr. v. 485 ; 

 Engl. Pfl. Ost-Afr. C. 422. Zemna arrhiza, Linn. Mant. 294. Bruniera 

 vivipara, Franch. in Billotia, i. 25, t. 1. 



IbO-wbt Guinea. Angola : Barra do Dande ; plentiful in lakes near the hanks^ 

 of the River Dunde, near Bombo, Welwitsch, 210! and by the banks of the Kiver 

 Lifuno, at Libollo, Welwitsch / Icolo e Bengo ; Lagoa de Quilunda, near Pi-ata, 

 Welwitsch, 211. Huilla ; between Huilla and Humpata, Johnston! 



XMozamb. Bist. German East Africa : Usaramo ; Dar es Salaam, Rilde- 

 brandt, 1236 ! 



Very widely distributed in the Eastern Hemisphere, and has been found in Brazil 

 according to Hegelmaier. 



5. "W. cylindracea, Hegelmaier, Monogr. Lemn. 123, t. I, Jigs. 14, 

 15. Frond minute, about J lin. long, I lin. broad and thick, ellipsoid, 

 ovoid, or subcylindric, obtuse at both ends, or somewhat pointed at the 

 apex, convex on both sides, but the lower surface more so than tlie 

 upper, deep green, shining. Flowers unknown. — Hegelmaier in Engl. 



