422 ])H. A. B. RENDLE — SYSTEMATIC 



Mauritius — {Bory de St. Vincent ; Commerson ; Hohilliard ; Johnston, Riviere de 



Motra ; and others). 

 Bourbon — (In Herb. Link.). 

 Madagascar — {Baron ^ no. 2629 ; Hmnhlot, no. 351). 



28. ^^AJAS SETACEA, sp. nov. (PI. XLII. figs. 177-182.) 

 N. minor var. setacea, A. Br. in Jourii. Bot. ii. (1864) 278. 



Debilis, caulibus filiformibus ; foliis setaceis, linearibus, cum apice obtuso et margine 

 minute denticulato, in parte ioferiore ssepius integro ; vctginis subcylindricis late 

 auriculatis, auriculis paucidentatis ; squamulis intravaginalibus lineari-acuminatis ; 

 floribiis masculis . . . . ; ovario nudo ellipsoideo, stigmatibus duobus ; fructu parvo 

 oblongo, pericarpio tenui ad semen rugiilosum adhserente ; testa cum areolis quadratis 

 minutis numerosis subdistincte lineata. 

 Shoots weak, with filiform internodes generally 1'5 to 2-5 cm. long. Leaves, including 

 the sheath (225 mm.), I'i to 1*7 em. long by -3 to -4 mm. broad, very narrowly setaceous, 

 uniformly linear, tapering very slightly at the blunt 1-2-dentate apex ; marginal teeth 

 20 to 30, very small, consisting of an ascending spine raised but slightly above the leaf- 

 margin ; they are generally w^anting in the lower part, and are often broken off from 

 older leaves. Sheath passing into well-marked broad auricles, tbe margin of which is 

 broken into a few (4 to 5) prominent spine-tipped teeth. Ovary 2 mm. long; style 

 tapering. Fruit 15 to 1*75 mm. long. The membranous pericarp conforms closely to 

 the seed, which is marked with about 30 j^arallel longitudinal rows of fairly distinct 

 square areolae, absent from tlie prominent raphe. 



Bourbon — Braun states that he received the plant from Mougcot without the 

 collector's name. 



29. Najas horrida, A. Br. (PI. XLII. figs. 183-191.) 



N^horrida, A. Br. ex Maguus, Beitr. pp. vii, 46^ 47 (1870). 



iV. jwec/i«fl!/fl, Magnus, in Aschers. & Schweinf. Ilhistr. Fl. Egypt. [Mem. Inst, fllgypt. ii. pt. i.] 145 

 (1889), et in Ber. Deutsch. Bot. Ges. xii. (1894) 219. 



Caulinia pectinata, Pari. Fl. Ital. iii. 665' (1858). 



Bobusta vel interdum gracihs, caulibus elongatis effusis, ramis brevibus dense fruticoso- 

 ramulosis ; foliis crassiusculis, rigidis, plicatis, falcate recurvatis, margine cum denti- 

 bus magnis patentibus armato ; vagina late truncate-rotundata, superne denticulata ; 

 squamulis intravaginahbus hneari-angustatis, acutis; floribus solitariis, masculis 

 sessilibus, spatha anguste ovoidea vel ovoideo-oblonga, in collum breve cum ore 

 obliquo spinulifero desinente ; ovario nudo, ellipsoideo, stylo brevi conico in sti"-mata 

 duodiviso; fructu oblongo-ellipsoideo ; testa seminis in areolis subquadratis minutis 

 distincte lineata. 



Main shoots long and spreading, with short lateral branches, passing after a few short 

 internodes into a dense bushy head. Lower internodes often very long, sometimes 

 reaching 12 cm., often about 5 or 6 cm. ; breadth -5 to 1 mm., in the upper' part of the 

 main shoots generally between 1 and 2 cm. Lewves with minutely bispinulose apex, the 



