THE BRITISH SPECIES OF NAJAS 107 
2. FLEXILIS Rostk. & Schm. Fl. Sedin. 382 ae 8 bre 
a 1088, (1850); A. Braun in Journ. Bot. 1864 4, 276; Sadler 
5, 297; Moron ng in Mem. Torr. Bot. Club, iii. pt. 2, 59, 
(1808) ; Britton & Brown, Ill. Fl. North. U.S. i. 81, fig. 180 (ise); 
Cam pbell, A Morphological aa of Najas and Zannichellia, 1897 ; 
Rendle, J. c. 408, t. 40, figs 
Occurs also in North Ge erates Upland, and Finland; and was 
apparently more prevalent formerly in North-west Europe than at 
the present day, as it is recorded from recent beds in South-west 
Norway and Sweden, as well as in East Finland, Hanover, and 
Holstein. A small-fruited variety (var. microcarpa Nilss.) occurs in 
Lake Ringsjén, South Sweden. The species is generally distributed 
in Canada and the Northern United States. Itis readily distinguished 
by the minute marginal leaf-teeth, sloping sheath, and polished seed. 
Section 2. Huvaginate.—Only the male flowers enclosed in a 
spathe.  Sheat hs eam or more or less auricled. Species 16, 
a tropical Old Wor 
. N. mrvor Allioni, ‘e Pedem. ii. 221 (1785); A. Br. in Journ. 
we 1864, 277; Nees, Gen. Pl. Fl. Germ. ui. t. 44, figs. 22-24 ; 
Peterm. Deutsch. Fl. 589, t. 83, fig. 658; Schkuhr, Bot. Handb. 
iii. 252, t. 296; Reid, Origin of British Flora, 160; Rendle, J. c. 
410, t. 41, figs. 105-115. ae 408, figs. 1-9.) 
Small much-branched plants from a few inches to about a foot 
2 to nearly 4 line long. Blade ee from about 4 to 3 in. in 
length by 4 line or less in width, excluding the teeth, the length of 
which varies from about one-third the ea, in the lower part 
of the blade to three-fourths the leaf-width in 
Male flowers about 3 ap long before Listipation of the stalk ; 
spathe ellipsoidal, with a ort neck bearing a few spines round 
the mouth; perianth sicealy “investing the 
above which it terminates in a pair of thick closed lips. Anther 
ellipsoidal, unilocular, pollen-grains rounded or subelliptical 
Before in guen the stalk elongates and pu he flo 
throug eck of the ee which | oe lengthwise ; ce 
in two anja siping 4 
