Najas| XXV. POTAMOGETONACES. 95 
4. NAJAS L.; Benth. & Mook. f. Gen. Pl. iii. p. 1018. 
1. N. Welwitschii Rendle sp. nov. 
Najas sp. Magnus Beitr. Gatt. Najas, pp. 44, 45, t. v.fig. 18 (1871). 
A bright green shining herb, with spreading shoots; leaves. 
flat, linear-tapering, spreading when alive, the margin bearing 
numerous ascending, somewhat prominent teeth, the sheath 
broadly rounded or truncate, asymmetrical, with numerous small 
teeth on the upper edge; intravaginal scales subulate; flowers 
solitary, unisexual, enveloped in an oval spathe with a cylindrical 
spiniferous or dentate neck ; anther quadrilocular; stigmas two ; 
fruit enclosed in the persistent spathe; seed-coat distinctly 
marked with about twenty-five rows of four-sided pits. 
Shoots to 12 in. long, lower internodes 14 to 2 in. by } line 
wide, decreasing in the branches. Leaf-blades generally 3 to 1 in. 
long by about + line broad; marginal teeth 12 to 16, somewhat 
broadly triangular and ending in an ascending brown spine,. 
about half the leaf-width in length in the middle of the blade. 
Sheaths about.1 line long and nearly or quite as broad. Male 
flowers subsessile, nearly 14 line long, female about 1 line. Seed 
17 line long by 3 line in diameter, very pale brown. Near 
NV. Schweinfurthii Magnus, but distinguished by its rounded. 
leaf-sheath, quadrilocular anther, etc. 
Barra DO DanpDE.—A bright green lucidulous herb, floating at the 
bottom of water, generally not very deep and attached in the mud 
by a rhizome bearing long fibres; stiffish when alive but soon becoming 
flaccid on exposure to air. Leaves spinulose-denticulate, spreading. 
with scarcely or slightly recurved tip. Lakes called Lagoas de Bombo, 
on the left of the river Dande. In fr. end of Sept. 1858. No. 247°. 
Barra Do Benco.—At the great lake Lagoa de Quifandongo 
(otherwise Quifangondo), near Quisequele. Without fl. Nov. 1853 ;. 
in fr. Jan. 1854. No. 247. 
XXVI. ERIOCAULACEA. 
1. ERIOCAULON L.; Benth. & Hook. f. Gen. Pl. iii. p. 1020. 
Dichrolepis Welw. Apont. p. 542 (1859). 
1. E. huillense Rendle sp. nov. 
Glabrous ; stem suppressed ; leaves very short, subulate, acute ; 
scapes numerous, filiform, quadrangular, compressed ; sheath with 
a long oblique mouth and generally blunt entire apex ; flower- 
heads subglobose when ripe, black, moneecious, with female flowers. 
on the outside, and male and female mixed in the centre; re- 
ceptacle oblong, pilose; involucral bracts fuscous, obovate or 
obovate-oblong, apex rounded ; floral bracts fuscous, obovate, apex 
rounded or shortly apiculate, concave ; flowers dimerous ; female: 
sessile, sepals olive-green with a broad membranous keel as large or 
almost as large as the rest of the sepal, the whole forming a more 
or less asymmetrical rhomboideo-flabelliform structure, apex api- 
culate, upper edge irregularly denticulate, upper edge of keel 
grossly dentate and irregularly denticulate; petals close above- 
