EEVISIOK OP THE GENUS NAJAS. 409 



tatis ; florihus masculis solitariis, breviter pedicellatis, spatlia ellipsoideo-oblonga in 



coUum apice paucispiniferum desinente ; anthera qiiadriloculari ; femmels a^gre- 



gatis nudis, ovario subovoideo, stylo in stiijmata bina partiio ; fructvb parvo sub- 



ellipsoideo, semine ruguluso cum areolis subquadratis in ordinibus circa 20 lineato. 



The largest specimen, an incomplete shoot, has an almost straight stem 40 cm. high 



and 1 mm. in diameter ; internodes very regular, about 2'5 cm. long, becoming sliorter 



(2 cm.) near the apex. The short stiff ascending lateral branches increase in length 



regularly upward from 1 cm. to 4 cm., decreasing again somewhat towards the apex ; 



the branches or their short ascending branchlets are densely leaved ; the spreading, slightly 



recurved leaves give a plumose appearance to the whole. Leaves 1 2 to 2*2 cm. long, 



■4-*5 mm. broad, not including the teeth, which project about half the leaf-width from 



the margin, and number between 15 and 20 on each side ; apex ending in a single spine ; 



sheaths 2 to 3 cm. long and about as broad, the sloping shoulders of each wdth 5 to 7 



rather prominent teeth. 



Male flowers 2 mm. long. Fruit little more than 1 mm. 



West Indies — Cuba ( JVright, nos. 78, 605, 3710, pars in Herb. Krug et Urban). 



Brazil — Pernambuco {Schenck, no. 4101 ; Ridley). 



Var. LAXA, A. Br. in Sitzungsb. Ges. Naturf. Er. Berlin, 1868, 17. 



Planta debilis et laxa, f oliis quam in typo latioribus, cum dentibus marginalibus ascenden- 

 tibus et minus prominulis, apice acuminato, vagime dentibus paucis et parvis. 



Differs considerably in habit from the type, but the flowers are exactly the same. 



West Indies — Cuba ( JVright, nos. 73, 3716, pars altera in Herb. Krug et Urban). 



13. Najas coxeekta, A. Br. (PI. XL. figs. 75-77.) 



N, conferta, A. Br. in Sitzungsb. Ges. Naturf. Fr. Berlin, 1868, 17; Magu. Beitr. 47 &c. (1870); 



K. Schum. in Mart. Fl. Bras. iii. pt. 3, 728 (1891), iu part. 

 N. arguta var. conferta, A. Br. in Journ. Bot. ii. (1861) 277. 



Herba minor ? confertim ramosa et dense foliata ; foUls anguste linearibus subobtusis, 

 margine valde denticulato, denticulis vix numerosis ascendentibus vel patentibus 

 laminoe latitudinem excedentibus ; vaginis cum denticulis paucis vix prominulis 

 instructis ; squamulis intravaginalibus e basi anguste lineari tiliforinibus ; floribm 



; fructu anguste ellipsoideo-oblongo, ad semen conformante, testa cum 



seriebus arearum angustarum quadrilateralium numerosis longitudinaliter at 

 obscurius exsculpta, pallide flavescente-brunuea. 

 Apparently a small plant, characterized by^ bushy growth and very thick foliage. 

 Leaves 1-2 to 1*7 cm. long, about -5 mm. broad, with 8 to 10 large, irregular, acutely 

 triangular, patent teeth on each margin. 1 could find no flowers on the specimens 

 which in my opinion belong to this S2)ecies. Seed narrow, 2 mm. long by '4 mm. in 

 diameter, slightly narro\\er at the apex than at the base, obscurely marked with 

 numerous rows of narrow drawn-out recesses. 

 AVest Ixdies — Cuba {IFright, nos. 75, 3715). 

 Brazil — (Max von Neuwied) ? Bio Tocantin ( IFeddell, no. 237 1, in part). 



