Heteranthera. | CXLI. PONTEDERIACE# (BROWN). 3 
Monogr, Phan. iv. 521; Engl. Pf. Ost-Afr. C. 137; Durand & Schinz, 
Consp. Fl. Afr. v. 419. 
Upper Guinea. Senegal, Sieber, 51; Perrottet,781. Senegambia, Heudelot, 
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 Solms in 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, 
3-1} in. broad, cordate, obtusely pointed, with petioles 24-8 in. long, 
erect or ascending. Flowering stems 14-4 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 24-3 in. long, cylindric, very slightly 
curved and a little oblique 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. Pl. Welw. ii. 67, not of Presl. J sp., 
Thomson in Speke, Nile, Append. 649. 
Wile Land. Cordofan: between Melbes and Obeid, Cienkowsky, 378 (ex Solms) ; 
Arashkol Mountain, Kotschy, 9! British East Africa: Bongo: Gurfala, Schwein- 
Surth, 2239! Madi, Speke & Grant, 655! 
Lower Guinea. Angola: Pungo Andongo ; in ponds near Banza de Quitage, 
Welwitsch, 3013! 
Mozamb. Dist. Portuguese East Africa: Nkueza, on the River Zambesi, 
irk ! 
Also in the. Transvaal. 
This differs from H. callefolia, Reichb. in its shorter perianth-tube, and in the 
closed flower having only 1 stamen, According to Rendle in Cat. Afr. Pl. Welw. ii., 
67, Welwitsch’s 3013 is indistinguishable from the type of Monochoria vaginalis, 
Pres], 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 cleistogamous 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 flower- 
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 
