Lemna.] cli. lemnace^ (brown). 203 



of the River Loge, and in nearly stagnant streamlets near Ambriz, WelwiLsch, 208. 

 Loanda ; in deep ponds near Bemposta, Welwitsch, 205 partly ! Icolo e Kengo ; in 

 a lake called Lagoa de Quilunda, near Prata, and in lakes in the Libongo district' ou 

 the left bauk of the River Lifune, Welwitsch, 213. Mossamedes ; in deep ponds at 

 the mouth of the River Giraul, and near Aguada, Welwitsch, 207 ! 



Mozaxnb. Bist. German East Africa : Usambara ; Lutindi, Hoist, 3441 ! 

 Usaramo ; Bagamoyo, Hildehrandt, 1279 ! Portuguese East Africa : Quilimane 

 Stuhlmann (ex Hegelmaier). 



Widely distributed through the warmer parts of the earth. 



This species is very similar to L. minor, Linn., and not easily distinguishable in 

 the dried state without careful examination. The fronds, however, ar^ smaller, and 

 the root-cap more acute than in L. minor, and the root-sheath has a wing ou each 

 side of it, which is wanting in L. minor. 



5. Ij. sequinoctialis, Welw. Apont. 578. Fronds very small, 

 J-| lin. long, J-i lin. broad, elliptic or elliptic-obovate, "somewhat 

 fleshy, slightly convex, obtusely keeled longitudinally on the upper face, 

 ellipsoid at both ends, minutely but distinctly corniculate. Flowers 

 emerging from a marginal slit " (Wekvitsch). Root solitary from near 

 the basal end of the underside of each frond. Fruit ellipsoid, ribbed. 

 — Hegelmaier, Monogr. Lemn. 142 ; Rendle in Cat. Afr. PI. Welw. ii. 

 91. L. angolensisy Welw. ex Hegelmaier in Journ. Bot. 1805, 112 ; 

 Hegelmaier, Monogr. Lemn. 141, t. 7, figs. 9-17, and in Engl. Jahrb. 

 xxi. 296 ; Durand &, Schinz, Conspect. Fl, Afr. v. 484 ; Engl. PH. Ost- 

 Afr. C. 422. 



Wile ]Land. British East Africa : Niamniam ; at Makporru Hill, Schwein- 

 fvrth, 3740 ! at the River Ibba, near Nyanye, Sehiveinfurth, 3986 ! Uganda ; Man- 

 yonyo (Manjonga), Stuhlmann (ex Hegelmaier). 



Xiower Guinea. Angola : Loanda ; in deep ponds near the town of Loanda 

 Welwitsch, 206 ! 



In the dried state 1 find the longitudinal keel on the upper surface to be mucii 

 more evident in Schwcinfurth's specimens than in those of Welwitsch. 



2. WOIiFFIA, Horkel; Benth. et Hook. f. Gen. PI. iii. lOUl. 



Flowers seated in a cavity or in two separate cavities in the upper 

 surface of the frond, without a spathe, microscopic, rarely seen. 

 Stamen 1 ; anther l^celled, opening by a slit across the top and the 

 valves becoming reflexed. — Fronds small or minute, thin and flat, or as 

 thick as broad, subglobular, hemispherical, ellipsoid, elliptic, oblong or 

 linear, entire or rarely toothed at the margin or end of the frond, 

 entirely destitute of roots, but in two species the lower lip of the 

 cavity from which the young frond emerges is produced into a 

 moderately long flat hyaline process that might easily be mistaken for 

 a root ; this process is a development of the stalk by which the young 

 frond is attached to its parent, and which elongates extraordinarily 

 after their separation. 



Species 12, widely distributed in all the warm and temperate parts of the earth. 



