EEVISION OF THE GENUS NAJAS. il7 



duobus terminato ; fruotu ellipsoideo, pericarpio tenui ad semen conformante ; 

 testa cum areolis distinctis in medio subquadratis in serie longitudinali notata. 



Plants with spreading shoots, 16 to 20 em. or more in length, Avith a greater or less 

 tendency to a dichotomous form of branching, producing in the higher grades a more or 

 less bushy growth. Internodes varying very much ia length ; generally 3 to 4 cm. long 

 in the lower part of the shoots, becoming much shorter above; in lax specimens longer, 

 in close-grown specimens shorter ; diameter generally about '5 mm., but may reach 

 '75 mm. Leaves thin, ascending, or the lower ones more spreading ; the larger with 

 short lines running horizontally towards the margin , 1-5 to 3-5 mm. long by '3 to nearly 

 1 mm. broad. Sheaths generally 2'5 to 3 mm. long, auricles bearing a few (i- to 6) 

 spiny teeth above and on the outer edge. Marginal teeth generally ascending, rarely 

 patent, consisting of a small subtriangular outgrowth of the leaf-surface, terminating in 

 a slender sharp spine ; 6 to 20 on each side, often scarce in the lower part of the leaf. 



Male and female flowers on the same shoot; male 25 to 275 mm. long; spathe 

 ellipsoidal, ending in a cylindrical beak ^ to ^ of the whole length, terminating in a 

 fringe of slender, sharp, brown spines; perianth bilabiate, closely fitting to the anther, as 

 in Najas minor, the thickened lips meeting at the top ; pollen-grains oblong. Dehiscence 

 as in N. minor. Eemale naked and sessile, 2 5 to 3 mm. long; one of the stigmas 

 occasionally terminating in a brown spine. Fruit 2'25 to 25 mm. long. Seed plainly 

 marked with about 20 rows of quadrate to polygonal pits. In the middle of the seed the 

 markings are more regular, subquadrate, and about as broad as long ; above and below 

 they become less regular and polygonal. 



India — Bengal {Kurz ; Clarke, no. 31870) ; Rajpore Jheels {Kurz) ; Calcutta Jheels 

 (Thomson); Gwalior {Maries) ; Behar {Rook.f. no. 639). 



SuMBAWA {Zollinger, no. 3398). 



TiMOE — Koepang {Martens, Naiimann). 



Philippines — (Commerson) ; Manila {3feyen)', {Bar the, {[.el fundo dc la laguna de 

 Bay, ' Voyage de la ' Sibylle ' ')• 



Moluccas — In lacu prope Gorontales. 



Japan (?) — {Miquel, a doubtful fragment, with young flowers only, in Herb. Berlin). 



Var. MINOR, var. nov, 



Planta foliorum dentibus minus conspicuis ; fructu minore. 



Besembles the type in habit, but the teeth on the adult leaves are only about f to ^ of 

 the leaf-width. The leaves reach about 2 cm. in length, wdth a breadth of nearly -5 mm. 

 just above the sheath, tapering to -3 mm. below the apex. Sheath-auricles rather long 

 and sometimes falcate. Seed ellipsoidal, brown, 1*5 mm. long, with 11 rows of large con- 

 spicuous, more or less irregularly quadrate, or polygonal markings, becoming smaller 

 near the raphe. 



Western India — Kaktee tank, near Belgaum (Herb. Calcutta). 



22. Najas talciculata, A. Br. in Journ. Bot. ii. (1861) 278 ; Hook. f. PI. Brit. Ind. 

 vi. 569 (1893). (PL XLII. llgs. 145-151.) 

 Monoica, graminosa, caulibus tenuibus elongatis erectis, ramis brevibus ascendentibus ; 



