V 



REVISION OF THE GENUS XAJAS. 307 



Ions, 1 to 2 mm. broad, bearini,'' 2 or 3 lateral toetli, 1 or 2 dorsal, and a sharp terminal 

 tooth ; marginal teeth large, triangular, 1"5 to 2 mm. long, ending in a conspieuous sliar]) 

 reddish-brown spine. Ovary 2-3-styled. 



China — Province of Kianang (Staunton, in Herb. Mus. Brit.). 



Var. MURiCATA, A. Br. ex K. Solium, in Mart. Fl. Bras. iii. pt. 3, 725 (1894) (non 



Hartmann). (PI. XXXIX. fig. 12.) 

 N. muricata^ Dchlc, Fl. I^o^ypte, 281, t. 50. fig. 1 ; Cham, in Linnffia, iv. 500 (1829) ; Kuiitli, Ennm. iii. 

 ■ 113 (1811) ; A. Braun, in Jourri. Bot. ii. (1864) 276; Boiss. Fl. Or. v. 27 (1884). 

 N. major, AIL; Trimen, in Journ. Bot. xxvii. (1889) 167; Hook. f. Fl. Brit. Ind. vi. 569 (1893). 

 Caulinia muricaia, Spreng. Syst. i. 20 (1825). 



Planta internodiis dense muricatis ; foliis linearibus, margine dcntihus 7-10 dcnsis 

 patentibus instructis, in dorso et vagina quoque spinosis, dentibus laminae 

 latitudinem saepissime excedentibus ; fruetu minore. 

 Internodes 1 to 3*5 cm. long, shorter in the Ceylon than in the Egyptian specimens, 

 1 mm. wide, thickly covered with short spines. Leaves 1'2 to 1*8 cm. long, -5 to 1 mm. 

 l)road, bearing 7 to 10 patent triangular teeth on each side, equal to or generally exceeding 

 in length the leaf-width ; the back bears 3 to 5 spines, the sheath generally two pro- 

 minent teeth on the shoulder and (in the Egyptian specimens) often a spine on the back. 

 Seed 3*5 mm. long by 2 mm. broad, distinctly marked with small 4-5-polygonal areolae. 

 Lower Egypt — Damietta (Sieber, J^hrenherg, Bove). 

 Cetlon — Kainiuuai [Nevill), 



Var. GRACILIS, Morong in Bot. Gaz. x. (1885). 255, et in Mem. Torr. Bot. Chib, iii. no. 2 

 (1893) 59; A. Gray, Man. Bot. [ed. 6] 566 (1890). 

 Var. angustissima, K. Schum. in Mart. Fl. Bras. /. c. (founded on the same plant {CartitfS, no. 2705] 

 as Morong's variety) . 

 Gracilis, internodiis elongatis; foliis anguste linearibus, margine cum dentibus numerosis 

 p>atentibus magnis instructo, doi-so inermi vol paucidentato ', vagina utrinque l-o- 

 dentata ; fruetu minore. 

 Internodes 5 to 8 cm. long, becoming shoiier at the ends oF the long slender shoots, 

 rarely with a few spines. Leaves generally between 2*5 and 1 cm. long and 5 to 7 mm. 

 broad, with 8 to 12 teeth on each margin ; teeth -5 to 1 mm. long, generally equal to or 

 longer than the leaf-width ; sheaths with 1 to 3 prominent teeth on each shoulder. Ilale 

 jlovjers scarcely 3 mm. long. Fruit oblong and narrowed at each end, 3 5 mm. long, 

 1*6 mm. in diameter. Morong describes the seeds as " sculptured with about 25 rows of 

 nearly square or irregularly oblong reticulations " ; in the very few which I have seen, 

 this character is evident only about the middle of the seed. The plant when dry is 

 tinged with purple. 

 Florida — Near Cape Bomano (Cnrtiss, no. 2705). 



Note. — Morong, in describing the leaf, sajs " 15-2-1 large teeth on the margin '' in Bot. Gaz. I. c, " margins " in 

 Mem. Torr. Bot. Club, I. c. He probably refers to the number of teeth on both margins taken together, Schnmann, 

 however {I. c), says " foliis .... 15-24 serraturis utrinque ornatis," but this is probably a slip, as I have seen the 

 Berlin specimen, which conforms to the description given above. 



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