REVISION OF THE GENUS NA J AS. 40.'} 



Fruit beaked with the neck of the persistent spathe and the remains of the styles ; 

 2 5 to 3 mm. long without the beak, by "7 mm. in diameter. Spathe very thin and 

 membranous, and easily peeled off, exposing the pericarp, which clings closely to the seed 

 and shows about 25 regular rows of squarish or hexagonal markings. 



Madagascar— (Bildebrandt, no. 4027; Baron, nos. 333J), 3119). 



6. Najas ancistrocabpa, a. Br. ex Magn. Beitr. pp. vii and 2t, t. 3. iigs. 1-5 (1870). 

 Planta caulibus dichotome ramosis; foliis recurvatis, iis A. mlnoris similibus, sed 



minus rol^ustis et angustioribus ; vaghiis truncacis vel rotundatis; Jlore masculo a 



spatha ellipsoidea cum coUo breviter cylindrico, ore spinifero, vestito ; perianthio ad 



antheram quadrilocularem arete applicito ; fructii parvo tenui falcato a spatha 



persistente incluso, in curvo interiore carinato, pericarpio longitudinaliter striato. 



Leaves 1-5-2 cm. long, generally •25-'35 mm. broad, with about 15 teetli on each side; 



sheaths with about 5 teeth. Fruit very narrow, curved towards the axis into a semicircle, 



much smaller than in ^. minor, protruding from the sheath. Pericarp clinging closely to 



the testa and marked out by fine longitudinal and faint transverse lines into regular rows 



of areas about twice as lonj^ as broad. 



Japan — Yokohama ( TFichura, no. 813, in part). 

 A very imperfectly knowm species. 



§ 2. American(jB. 



7. Najas flexilis, Rostk. & Schmidt. (PI. XL. figs. 92-98.) 



N.jQxilis, Rostk. & Sciimidt, Fl. Sedm. 382 (1824) ; Cham, in Liinijea, iv. (:829) 501 ; Kunth, Enura. 

 iii. 114 (1841); A. Br. in Journ. Eot. ii. (1864) 276; Phytol. iii. (1850) 1088; Sadler in Journ. 

 Bot. xiii. (1875) 297; Garcke, Iliustr. Fl. Deutschl. 566 (1895) ; Fries in Bot. Notis. 1850, 227; 

 Nilss. in Bot. JJotis. 1881, 137; G. Aiiderss. Svensk. Vaxtvarld. Hist. 41, t. 32 (1896), & in 

 Enf,4. Bot. Jahrb. xxii. (1896)467,t. 4. tig. 14; C. A. Weberin Abh. Natnrvv. Ver. Brem. xiii. (1896) 

 434, &c.; A. Gray, Man. Bot. [ed. 6] 566 (1890); Macoun, Cat. Canad. PL ii. 91 (1888), & in 

 Canad. Rec. Sci. 1895, 276 ; Moronj,^ in Bot. Gaz. x. (1885) 255, et in Mem. Torr. Bot. Club, 

 iii. (1893) no. 2, 59, t. 66; S.Watson, in Geol. Surv. Calif. (Bot.) ii. 191 (1880); Jonsson iu 

 Act. Univ. Lund. xx. (1883-4) 1. 1 ; Britton & A. Brown, 111. Fl. North. V. S. i. 81, fig. 180 (1896). 

 N. gramlnea, Rostk. ex Link, Handb. i. 287 (1829), non Delile. 

 N. canadensis, Michx. Fl. Bor. Am. ii. 220 (1803) ; Pursh, Fl. Am. Sept. 602 (1814) ; Cham, in Linn^ea, 



iv. (1829) 502; Kunth, Enura. iii. 115 (1841). 

 Caulinia flexilis, Willd. in Mem. Acad. Roy. Sci. Berl. 1798, 89, t. i. fig. 1, et Sp. PI. \s\ 183 (1805) ; 



Pursh, /. c. 

 C.fragilis, Pursh, /. c, non Willd., probably refers to this species. 

 Fluvialis flexilis, Pers. Syn. ii. 530 (1807). 



Erecta vel suberecta, internodiis tenuibns rigidulis, ramis erectis vel ascendentibus, apiee 

 sa3pe plumosis ; folds patentibus saepe graciliter recurvatLs, anguste linearibus, 

 apiceni versus saepe angustatis, acutis vel acutiusculis, marginibus siepe incurvatis 

 spinalis minutis numerosis ascendentibus instructis ; vaginis superne cum dentibus 

 paucis subprominentibus munitis ; squamulis intravaginalibus filiformibus, interdum 

 basi latioribus, vel lanceolatis ; jloribus solitariis, masculis sub apice ramulorum 

 fertilium paucis breviter pedicellatis, spatha oblonga, interdum ovali-oblonga, superne 



SECOND SERIES. — BOTANY, VOL. V. 3Q 



