REVISION OF THE GENUS NAJAS OF LINNJEUS. 277 
Spreading and much branched; the leaves shorter, undulate, on each 
side of the margin with about 20 teeth; the fruit rather shorter.— 
Guadeloupe (Duchassaing !) ; and similar forms from Texas (Lind- 
heimer !) and Mexico (Mueller !). 
y. Curassavica, A. Braun. Leaves twice as broad as those of the 
normal form, smooth, on each side of the margin with 40 teeth.— 
Curacao, at El Hato, growing with a peculiar form of Chara polyphylla 
(Seemann!). Allied forms from St. Domingo (Herb. Willdenow !), 
and Mexico (Schaffner !). 
. Gollmeriana, A. Braun. Still larger and broader-leaved than 
the preceding ; leaves on each side of the margin with 40—50 teeth.— 
Caracas (Gollmer !). 
e. punctata, A. Braun. The short and little-developed side branehes 
impart a peculiar simple habit to this form. Leaves broadly linear, 
towards the point more narrowed, slightly wavy, on each side of the 
margin with about 24 teeth, and dotted by means of isolated brown 
cells.—Lake of Valencia with N. latifolia (Gollmer !). 
5. N. arguta, Humb. Bonpl. et Kth. Leaves rather broadly linear, 
on each side of the margin with about 20 teeth, which are formed by 
a many-celled projection bearing a 1-celled spiny apex; sheaths as in 
N. flewilis—New Granada (Humboldt!). For the present I regard 
as varieties :— 
B. tenera, A. Braun.—N. tenera, Schrad. Caulinia tenera, Nees ab 
Esenb. Leaves rather thinner and narrower, with about 25 teeth on 
each side of the margin.— Brazil (Poeppig! Martius !). 
y. conferta, A. Braun. Densely branched, leaves curved outwards, 
narrow-linear, with about 10 teeth on each side of the margin.—Brazil 
(Max von Neuwied !). 
6. N. minor, All.—Caulinia fragilis, Willd. Leaves bent backwards, 
narrow-linear, on each side of the margin with 7—10 large teeth, like 
those of N. arguta ; edge of sheath strongly and slightly upward pro- 
jecting, rounded-trüneate, towards es upper part with 6-10 teeth; 
fruit slender, dotted.—Europe ; Bengal (Hooker and Thomson !) ; 
' Carnatic (Belanger!); der esti Egypt (Ehrenberg !) ; 
in North America, doubtf I class as varieties several forms which 
I cannot wipes as iiia by any decisive characters :— 
B. tenuissima, A. Braun. Leaves horizontally patent, very narrow, 
setaceous, on ak side of the margin with 6-8 minute teeth, com- 
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