Potamogeton. | NAIADACEX (Bennett). 47 
- P. Richardii (Solms in Schweinf. Beitr. Fl. Athiop. 194 and 
292) ; ; stem stout ; submerged leaves few, finer in texture than the 
last ; floating leaves ovate or oblong-lanceolate, not plicate at the 
base ; stipules blunt, large ; peduncles stout, slightly swollen up- 
wards ; spikes dense- flowered ; fruit large, 21 lin. long ; style long, 
at first bent back, when ripe nearly central ; dorsal ridges 3, the tw 
lateral with blunt, wavy, tooth-like margins, slightly convex on the 
ventral margin, and indications of small bosses, but none of ee s 
specimens are quite ripe. Durand and Schinz, Conspect. Fl, Afr. v 
496. P. natans, A. Rich. Tent. Fl. Abyss. ii, 354, non L 
Katanart Reqion: Transvaal; Hooge Veld at Standarton, Reimann, 6801! 
: ‘Sebiae in ibaa The fruit is described from Abyssinian specimens collected 
y Schim 
5. P. javanicus (Hassk. in Verh. Natuurk. Ver. Neder]. Ind. i. 26); 
stem branehed, filiform; submerged leaves sessile, narrowly linear, 
acute ; floating leaves lanceolate, long petioled ; lower stipules slightly 
connate, the upper ones free, acuminate; peduncles slender; spikes 
varying from 3-8 lin. long; fruit compressed, oblique-obovate ; 
style straight with the ventral margin ; dorsal margin 3-carinate, an 
strongly repand denticulate, ventral nearly straight, with a projection 
in the centre tapering to either end, variable as to the teeth-like 
projections on various parts of the fruit, wich 3 are strongest in the 
Australian forms. P. tenuicaulis, F. Mueller, Frag. “Fl. Austr. 
1.90, 244. P. p arvifolia, Buchenau in Bremen , Abhanal. vii. 32. 
ag huillensis, Wieck n Herb. Kew. ; Durand and Schinz, Conspect. 
Fl, Afr. v. 495. 
Kazancn ReEeIon: Transvaal; Nylstroom River, Nelson, 290! 
N Reeton: Natal; Ur mtshati River, 3000-4000 ft., Wood, 4300! near 
York, giorno 9062! 
: Also in Tropical Africa, Australia, Malay Archipelago, India, North China, and 
apan, 
P. alpinum (Balbis, Mém. Acad. Tur. vii. 329); plant drying a 
duil reddish colour; stem moderately stout, unbranched, or very 
rarely branched ; submerged leaves very thin and translucent, 
sessile, strap-shaped, elliptical, attenuated at the base and apex 
fl oating leaves (not always present) obovate, elliptical-ovate or he 
lanceolate, subcoria iacearisis ie a es large, not winged; peduneles 
slender ; spike m any-flowere ense; fruit yellowish-red, oval-ovoid, 
acuminate at the apex, Ags ao and sharply keeled on the dorsal 
face, convex on the ventral. Misc. Bot.13. P.rufescens, Schrad. in 
Cham. Adnot. Fl. Berol. 5 
Sours Arrica; Brak River, Berlin Herbarium! 
Also in Europe, Asia, and America. 
7. 2 et rispum (Linn. Sp. Pl. ed. 1, 126); stem compressed, slender, 
branched ; leaves all similar, sessile, semiamplexicaul, strap-shaped 
oblong, or oblong, variously andulate, and strongly serrate at the 
