414 DK. A. B. EEXDLE— SYSTEMATIC 



Apparently a very small plant ; internodes less than '3 mm. broad ; leaves about 

 15 mm. long by about J mm broad, with 20 to 30 small teeth, recalling those ol Najas 

 grmninea, consisting of an ascending short spine-cell supported on a very low shallow 

 projection of the margin. Sheaths about 15 mm. long and not quite as broad ; auricles 

 low and rounded, beset on the upper edge with 4-5 sharp erect spine-teeth. Intravaginal 

 scales '6 mm. long. 3Tale flowers about 1 mm. long; spathe ruptured laterally on 

 dehiscence by the elongating flower-stalk, anther splitting at the top into two recurving 

 lobes. Ocary with style and stigmas a little over 1 ram. long. Fruit 1 mm. long ; 

 testa plainly marked with about 16 rows of square pits, becoming small and narrow next 

 the raphe and irregular towards the ends. 

 Described from a fragment kindly sent from Calcutta by Dr. Prain, 

 India — North Bengal, between Kishenganj and Oolabena {Kurz, in Herb. Calcutta.) 



17._Najas tenuissima, A. Br. 



N. temnssima, A. Br. ex Magnus, Beitr. 24, 45, t. v. figs. 13, 14 (1870). 

 N. minor var. tenuissima, A. Br. in Journ. Bot. ii. (1864) 277. 



Laxissima, ramis ssepius longis, tenuibus, laxiter foliosis ; foliis longis tenuissimis et 



setaceis, patentibus vel subascendentibus, dentibus marginalibus vix protrusis cum 



aculeo ascendente terminatis ; vaglnis N, minoris subauriculatis et cum dentibus 



paucis prominentibus instructis ; squamulis intravaginalibus parvis anguste 



linearibus ; floribus ut in N. mino7^e ; fructu ellipsoideo cum pericarpio tenui a 



semine mox separabile, hoc anguste ellipsoideo ; testa levi, areolas autem longas 



angustas quadrangulas permonstrante. 



Plants with generally long, slender, straggling, laxly-leaved shoots from 12 to 22 mm. 



high, sometimes much smaller, one fruiting plant being only 5 cm. high. Internodes 



•5 mm. or less in diameter, the lower 4 to 25 cm. long. Leaf-sheath with rounded sub- 



auricled shoulders, bearing each a few (4 to 6) prominent teeth ; about 1-75 mm. long. 



Blade very narrow, linear, about 12 mm. long by '25 mm. at its greatest breadth in the 



lower part ; teeth about 8 on each margin, projecting but slightly, and terminating in a 



sharp, ascending, brown spine. Intravaginal scales '4 mm. long. Fruits solitary or 



geminate in the leaf-axil, subsessile, 2*7 mm. long without the persistent style, 75 mm. 



broad. The thin pericarp is easily separable from the seed and shows no markings. 



Seed narrowly ellipsoidal. 



PiNLAND — Prov. Tavastland, lake Wesijarvi {Norrlin); nearBorga, "in aqua stao-nante 



' Moren ' appellata " {Scelan) ; both in Herb. Berlin. 



18. Najas gracillima, Magnus. (PI. XLI. figs. 122-125.) 



N. gracillima, Magnns, Beitr. 23 (1870) ; Morong in Mem. Torr. Bot. Club, iii. (1893) no. 2, 61, t. 68 i 



Britton & A. Brown, 111. Fl. North U.S. i. 81, fig. 182 (1896). 

 N. indica var. gracillima, A. Br. ex Engelm. in A. Gray, Man. Bot. [ed. 5] 681 (1868). 



Planta gracillima, caulibus filiformibus elongatis ; foliis planis, angustissime linearibus, 

 superne attenuatis vel subsetaceis; margine infcrnc Integra, superne denticulis 

 spiniferis ascendentibus vix prominulis distantibus instructa; caginis longi;^ 

 subcylindricis, auriculatis, auriculis brevibus latis irregulariter grosse-dentatis , 



