Kajas] XXV. potamooetonace.e. 95« 



4. NAJAS L. ; Benth. & Hook. f. Gen. PI. iii. p. 1018. 



1. N. Welwitschii Rendle sp. nov. 



JS^ajassy). 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 1} to '2 in. by ^ line 

 wide, decreasing in the branches. Leaf-blades generally f 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 neax-ly or quite as broad. Male 

 flowers subsessile, nearly 1^ line long, female about 1 line. Seed 

 li line long by 4 line in diameter, very pale brown. Near 

 N'. Schweinfurthii Magnus, but distinguished by its rounded 

 leaf -sheath, quadrilocular anther, etc. 



Baera do Danme. — 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-deuticulate, spreading, 

 with scarcelv 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 Bengo. — At the great lake Lagoa de Quifandongo 

 (otherwise Quifangondo), near Quisequele. Without fl. Nov. 1853 ;. 

 in fr. Jan. 1854. No. 247. 



XXVI. ERIOOAULACE^. 

 1. ERIOCAULON L. ; Benth. & Hook. f. Gen. PI. iii. p. 1020. 



Dichrolepis Welw. Apont. p. 542 (1859). 



1. E. huillense Eendle 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, monoecious, with female flowers- 

 on the outside, and male and female mixed in the centre ; re- 

 ceptacle oblong, pilose ; invohicral 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 



