278 REVISION OF THE GENUS NAJAS OF LINNJEUS. 
posed of a few cells projecting above the margin of the blade.—Fin- 
land (Hisinger !) 
y. Indica, A. Braun.— Caulinia Indica, Willd. (1198). Leaves 
not bent baekwards, but straight, longer, towards the point more nar- 
rowed, the edge of the sheaths more elongated towards the top (ear- 
shaped) ; fruit conspicuously excavate-punctate.—I include under this 
heading several forms again distinguished by the length of the leaves 
and the number of the teeth ; 5-10, rarely 15 teeth are seen on the 
margins-of the leaves of specimens from Tratiquebar (Klein!), Sum- — 
bawa (Zollinger !), Mauritius (Bory! in Herb. Willd., under the name 
of N. australis, Bory, and N. alternifolia, Willd.) ; 12—20 teeth, in the 
more robust forms from Manila (Meyen !) and Timor (Martens !). 
8. setacea, A. Braun. Leaves very narrow, setaceous (as in var. B), 
but with 20-30 very minute teeth, which, except the spiny point, are 
hardly projecting beyond the margin of the blade; edge of the sheaths 
still more ear-shaped and elongated than in var. fj, with 4 or 5 teeth 
on the upper part:—Mauritius (received: from Mougeot without the 
collector’s name). . 
7. N..faleieulata, A. Braun. Leaves narrow-linear, narrowed to- 
wards the apex, with 10-20 teeth on each side of the margin, which 
are formed by several cells, but do not project as much as those of N. 
minor beyond the margin of the blade; the edges of the sheaths are 
elongated upwards into auricles, which are rather long, pointed, 
eurved, slightly sickle-shaped inwards, margin of the inner edge quite 
entire, and on the outside with 3—5 teeth (see Fig. 4 of first sketch). 
— Madras (Wight !) ; Manila (Martens !). 
8. N. graminea, Del. (1813). Leaves linear, upwards slightly nar- 
rowed, with 36-40 teeth in the African specimens, 40—56 in the East 
Indian; the teeth projecting with only 1 or 2 cells besides that of the 
spiny point, beyond the edge of the blade; the sheaths on each side 
elongated into a lanceolate, pointed, stipulzeform auricle, which both 
on the inside and outside is beset with numerous teeth (see Fig. 5 of 
first sketch).—Egypt (Delile!, Ehrenberg !) ; Cordofan (Steudner!) ; 
Bengal (Hooker and Thomson!); Ceylon (Martens!); Java (Jung- 
huhn !) ; Celebes (Forsten !). 
B. tenuifolia, A. Braun.—N. tenuifolia, R. Brown, Prodr. (1810). 
Leaves narrower, almost setaceous, on each side with 30—40 teeth, 
which hardly project beyond the edge of the blade, except with their 
