Ueter anther a. ^ cxli. pontederiace.e (brown). 3 



Monogr. Phan. iv. 521 ; Engl. Pil. Ost-Afr. C. 137 ; Durand & Schinz, 

 Consp. ri. Afr. v. 419. 



Vpper G-ulnea. Senegal, -S'teier, 51 ; Perrottet,lH\. Seneganibia, ife«rf<'/o^ 

 230! 



I have been unable to examine a closed flower of this species, and give the number 

 of its stamens on the authority of Count Solms. 



2. H. kotschyana, Fenzl ex Solmsin Schweinf. Beitr. Fl.Aethiop. 

 205. Plant 5-12 in. high, herbaceous, glabrous, with the lower part of 

 the stem creeping, and rooting at the nodes. Leaves 1-2| in. long, 

 ^1 J in. broad, cordate, obtusely pointed, with petioles 2J-H in. long, 

 erect or ascending. Flowering stems 1 J-J: in. long. Flower-spike 2-4 

 in. long, with a submembranous spathe at its base. Flowers several, 

 sessile, ebracteate ; the basal flower concealed in the spathe within the 

 sheath of the leaf, never expanding, having but 1 stamen. Perianth- 

 tube of the expanded flowers 2J-3 in. long, cylindric, very slightly 

 curved and a little oblic^ue at the mouth ; lobes 2 lin. long, | lin. broad, 

 oblong, obtuse, spreading. Stamens 3, shortly exserted. Ovary oblong, 

 trigonous ; style filiform, as long as the stamens, with a simple slightly 

 thickened stigma. Capsule of the basal closed flower 8-9 lin. long, of 

 the other flowers 4-6 lin. long, oblong, trigonous. — Solms in DC. 

 Monogr. Phan. iv 522; Engl. Pfl. Ost-Afr. C. 137; Durand & Schinz, 

 Consp. Fl. Afr. v. 419. Monochoria vaginalis, Kirk in Journ. Linn. 

 Soc. viii. 147 ; Rendle in Cat. Afr. PI. Welw. ii. G7, not of Presl. M. sp., 

 Thomson in Speke, Nile, Append. 649. 



XTile l^and. Cordofan : between Melbes and Obeid, Cienkoiosky, 378 (ex Solms) ; 

 Arashkol 'yion\iX2L\\\, Kotschy, 9! British East Africa: Bongo: Gurfala, Schwein- 

 furth, 2239 ! Madi, Speke Sf Grant, 655 ! 



Jtovrer Guinea. Angola : Pungo Andongo ; in ponds near Banza de Quitage, 

 Welwitsch, 3013 ! ' 



Mozamb. Bist. Portuguese East Africa : Nkueza, on the River Zambesi, 

 Kirk ! 



Also in the Transvaal. 



This differs from H. callcbfolia, Reichb. in its shorter perianth-tube, and in the 

 closed flower having only 1 stamen. According to Rendle in Cat. Afr. PI. Welw. ii., 

 67, Welwitsch's 3013 is indistinguishable from the type of Monochoria vaginalis, 

 Presl, but in my opinion it is without doubt a species of Heteranthera, and, I believe, 

 H. kotschyana, although I have been unable to examine the cleistoganious flower, as 

 the specimen at Kew is in fruit only. Monochoria vaginalis has not yet been col- 

 lected in Africa. 



3. H. Potamogeton, Solms in DC. Monogr. Phan. iv. 521. Stem 

 elongated, sparingly rooting. Flower-stem bent backwards after flow^er- 

 ing. Leaves ovate or elongate-ovate, acuminate, with long petioles. 

 Flower-spike short, bearing a few distant normal and closed flowers 

 intermingled, the basal flower always closed and concealed in the spathe 

 within the sheath of the leaf. Normal or expanding flowers with a 

 gland-dotted perianth and 3 stamens ; closed flowers not gland-dotted, 

 and with only 1 stamen ; the basal one producing a large cylindric 



