276 . REVISION OF THE GENUS NAJAS OF LINNJEUS. 
e. intermedia, A. Braun.—N. intermedia, Wolfgang (Gorski), in 
Eichw. Nat. Skizze von Lithauen, 1830. Leaves narrow-linear, on 
each side of the margin with 5—7 large teeth, which are generally longer 
than the blade is broad ; sheath on each side with 1-4 teeth; fruit 
- 8-4 millim. long.— Principally in the north and east of Europe. 
£. microcarpa, A. Braun. Small and with short leaves; internodes 
of stem with few (5—10) spines; leaves on each side of the margin 
with 4-8 teeth as long as the blade is broad; sheath generally with 
only 1 tooth on each side ; fruit only 23 millim. long.— Canary Islands 
(C. Bolle !) 
n. paucidentata, A. Braun. ‘Very small and with short leaves; in- 
ternodes of stem with 1-3 spines on the upper portion; leaves with 
1-3 teeth on each side of the margin; sheath with one tooth on each 
side; fruit 4 millim. long.—In South-eastern France (Duvernoy !). 
. muricata, Del. Stem thickly covered with spines (50-100 on 
each internode) ; leaves linear, on each side of the margin with 7-8 
crowded patent teeth which are longer than the blade is broad, and on 
the back with generally 5 spines; sheaths with rounded edges, each 
with 2 teeth on the edge, and 1-3 spines on the back.— Egypt (Delile! 
Ehrenberg ! Sieber!) 
3. N. latifolia, Alex. Braun, Stems without spines; leaves broader 
than in N. major, linear-lanceolate, on each side of the margin with 
12-16 short teeth, and on the back with 5—7 spines; sheaths rounded, 
without teeth.—In the Lake of Valencia, near Caracas (Gollmer !). 
Secr. II. CavriN1A, Willd —Stems and back of = leaves without 
€: flowers (probably in all the species) monoici 
N. flexilis, Rostkov. et Schmidt.—Caulinia fenilis, Willd. 1789. 
N. fe e Miche, Leaves narrow-linear, smooth, on each side of 
the margin with 25—30 minute serratures, projecting beyond the edge 
formed of only one cell (that of the spiny point); edge of the sheaths but. 
slightly projecting, obliquely rounded (see fig. 1 of first sketch) ; the 
upper portion toothed.—Pomerania (Rostkovius ! and others) ; Branden- 
burg (Mund! Hertzsch!) ; Sweden; Ireland (Oliver!); Canada, and 
United States as far as Oregon (Lyall!); California (Chamisso !) ; 
Mexico (Schiede!, Scehaffner!).— There are a number of allied forms 
which at present I shall enumerate as varieties, though future investi- 
gations may prove several of them to be distinct species. 
B. Guadalupensis, A. Braun. — Caulinia Guadalupensis, Sprengel. 
