92 XXI. LEMXACE^. [Lerima 



Quilunda near Prata, growing with PiMia, XymphaBeaj, etc. 14 Sept. 

 1854. Somewhat scarce among fronds of A-oUa pcnuata R. Br. 

 (Welwitsch herb. No. 37) in lakes in the Libongo district, on the left 

 bank of the river Lifune. Sept. 1858. No. 213. 



MossAMEDES. — Fronds obovate-elliptical, with a short but evident 

 longitudinal keel on the upper surface. Anthers didymous. Plentiful 

 in deep ponds at the mouth of the river Giraul and near Aguada. In 

 fl. 18 July, 1859. No. 207. 



2. WOLFFIA Horkel ; Benth. & Hook. f. Gen. PI. iii. p. 1001. 



1. W. cylindracea Hegelm, Lemnac. p. 123, t. 1, figs. 14, 15 

 (1868), and in Engl. Bot. Jahrb. xxi. p. 302 (1895). 



Tehnatopliace cylindracea Welw. ex Hegelm. Lemnac. I.e. 



Libongo. — Floating, densely gregarious, deep green, shining, root- 

 less ; fronds cylindrico-elliptical, somewhat convex on both faces, the 

 longitudinal diameter twice the transverse, apices somewhat obtuse ; 

 offshoots growing out at the ends of the longitudinal diameter of the 

 frond from its southern axis. Flowers and fruit vainly sought. In 

 rocky pools on the mountains behind the Banza de Libongo, in the 

 purest, freshest drinking-water, where no other water-plant grows. 

 Sept. 1858. No. 212. 



2. W. Michelii Sclileid. Beitr. Botan. i. 229 (1844). 



W. arrhiza Wimm. Fl. Schles. 1857, p. 140 ; Hegelm. in Journ. 

 Bot. 1865, p. 113, Lemnac. p. 124, and in Engl. Bot. Jahrb., I.e., 

 p. 301 ; Dnrand & Schinz, Consp. Fl. Afr. v. p. 485. 



Barra do Daxde. — Plentiful and gregarious in lakes on the left of 

 the river Dande, near Bombo, about 8 geographical miles from the 

 river mouth. In fl. end of Sept. 1858. No. 210. 



IcoLO E Bengo. — Lagoa de Quilunda, near Prata, along with Plstia 

 and Nympheeece. Found in such enormous quantities that it is collected 

 in baskets with the Pixtia, which is as plentiful, and used as manure. 

 14 Sept. 1854. No. 211. 



3. W. repanda Hegelm. in Journ. Bot., I.e., Lemnac. p. 129, t. 4, 

 figs. 20-30, and in Engl. Bot. Jahrb., I.e. ; Durand &. Schinz, I.e. 



LoANDA. — Fronds oblong-ovate or ovate, a little larger than those of 

 L. minor, convex on both faces, bearing near the edge on the lower 

 face a process twice as long as the frond. Flowers on the back of the 

 frond as in W. urvhizu. Plentiful, mixed with Lemna i^aucicoduta 

 in deep ponds near Bemposta. In fl. and fr. March 1854. No. 205 

 (in part). 



4. W. Welwitschii Hegelm. in Journ. Bot,, Z.c.,p. 114, Lemnac. 

 p. 130, t. 4, figs. 1-10, and in Engl. Bot. Jahrb., I.e., p. 300. 



W. conguensis Welw. ex Trimen Journ. Bot. 1866, p. 221. 



Ambriz. — Fronds large for the genus, exceeding Lcmna polijrrhha in 

 diameter, very thin, pale green, pellucid, rootless, sometimes floating, 

 sometimes resting on the river mud. Flowers on the back of the leaf 

 as in Wnlffift arrhizn, but fruit sought in vain. Growing with other 

 species of the Order, and with Nymphajeae in the lakes of Quizembo, 

 and in sluggish streams near Ambriz. In fl. but without fr. Nov. 1853. 

 No. 209. 



