REVISION OF THE GENUS NA.TAS. 389 



stratum medium ; embryo magnus, rectus, macropodus, valde evolutus, ad testam 

 conformans, endospermuni nullum. 

 Per orbem terrarum, regionibus frigidis exceptis, dispersa. Species 31. 



Subgenus 1. Eunajas, Aschers. 

 Dioica; testa e stratis cellularuni indurataruoa pluribas (plus quam tribus) coiistructa. 



Generally plants of a sturdier habit than in the senond subgenus, with a greater tissue- 

 differentiation in stem and leaf, showing a well-marked epiderinis and a many-layered 

 cortex in the stem, with several layers between the intercellular spaces and the stele. 

 Leaf-teeth large, back of the leaf and internodcs with similar teeth, Male flower 

 enclosed in a spathe ; anther 4-locular. Female flower naked, generally 3-styled. 



One species N. marina^ 1. 



1. Najas mari^^a, Linn. (PI. XXXIX. figs. 1-30.) 



N. marina, lAim. ^^.V\. 1015 (/3 & y iuclusis) (1753), et Fl. Suec. [ed. 2] 345 (syn. Miclielii excl.) 

 (1755) ; Thedcn. in Vet. Acad. Handl. 183/ (1838), 2-11, t. 8, et in Flora, xxiii. (1840) 305, t. 3; 

 Nyman, Consp. FL Eur. 685 (1882), et Suppl. ii. 289 (1890) ; Arth. Bennett in Journ. Bot. xx. 

 (1883) 353, t. 241 ; C. Reid ex Strahan in Quart. Jovu'n. Geo!. Soe. Hi. (1896) 479, et in Proc. Roy. 

 Soc. Ixi. (1897) 45 ; Horuem. \^\ Dan. t. 2121 (1834) ; G. Anderss. in Bot. Notis. 1891, 249, et 

 Svensk. VUxtvarld. Hist. 42, t. 34 (1896), et in Engl. Bot. Jahrb. xxii. (1896) 468, t. 4. %. 13 

 (German translation); Morong in Mem. Torr. Bot. Club, iii. (1893) no. 2, 58, t. 65 ; A. Gray, Man. 

 Bot. [ed. 6] 565 (1890) ; K. Schum. in Mart. Fl. Bras. iii. pt. 3, 723, t. 123. fig. 2 (1894) ; 

 Mirbel, Exam, de la Division des Veget. en Eudorliiz. et Exorhiz. t. 3, in Ann. Mus. Hist. Nat. 

 xvi. (1810) (figures fruit, seed and embryo). 

 Var. latior, F. Muell. ex K. Sehum. in Mart. Fl. Bras. iii. pt. 3, 725 (1894). 



Var. muricata, Hartm. Handb. Skand. F\. (ed. 9) i. 197 (1864) ; "stems prickly, with red joints.^' 

 Specimen not seen, but probably only a form of N. marina. 

 N.fluvialis, Thuill. Fl. Paris (ed. 2), 510 (1799) ; L. C. Rich, in Ann. Mus. Hist. Nat. xvii. (1811) 233, 



t. 5. figs. 32, 33. 

 N.Jliwiatilis, Poir. in Lara. Encycl. iv. 416 (1795-96) ; et 111. iii. 395, t. 799, fig. 1 (1823). 

 N.fucoides, Griff. Notul. PI. Asiat. pt. iii. 182, t. 251 (1851). 

 N. latior, F. Muell. ex K. Schum. in Mart. Fl. Bras. iii. pt. 3, 804 (1894). 



N. wa;or, Allioni, Fl. Pedem. ii. 221 (1785) ; Cham, in Linngea, iv. (1829) 498; Linnsea, ix. (1834) 515, 

 t. 7, et X. (1835) 225, t. 1; Kuntli, Enum. iii. 112 (1841) ; A. Braun in Journ. Bot. ii. (1864) 

 275; Schnizl. Icon. Fam. Nat. i. t. 71. figs. 1-11 (1843-46); Gris in Bull. Soc. Bot. Fr. xiv. 

 (1867) 251 ; Roth, Tent. Fl. Germ. ii. pt. 2, 499 (1793) [the species is quoted N. major, Roth, 

 as frequently as N. major, All.] ; T. Nees, Gen. PI. Fl. Germ. iii. 44, figs. 1-21^ et 45, figs. 12,13 

 (1845); Peterm. Deutseh. Fl. 539, t. 83, fig. 658 a-/ (1849); Garcke, lUustr. Fl. Deutsch. [ed. 17] 

 566 (1895) ; C. A. Weber in Abb. Naturw. Ver. Brem. xiii, (1896) 462; Pari. Fl. Ital. iii. 662 

 (1858) ; Magnus in Nuov. Giorn. Bot. Ital. ii. (1870) 187 ; Irmisch in Flora xlviii. (1865) 83, 

 t. 1. figs. 21-24 (germination) ; Boiss. Fl. Or. v. 27 (1884) ; Hook. f. Fl. Brit. Ind. vi. 569 

 (1893) ; Franch. & Savat. Enum. PI. Jap. ii. 13 (1879) ; Benth. Fl. Austral, vii. 181 (1878) ; 

 Britton & Brown, 111. Fl. North U.S. i. 80, t. 179 (1896); Chapm. Pi. South Unit. States 

 [ed. 2] 652 (1883) ; S. Watson in Geol. Surv. Calif., Bot. ii. 191 (1880) ; Griseb. Fl. Brit. West 

 Ind. 507 (1864). 

 Var. IcBvis, DC. Fl. Fran9. (ed. 3) ii. 587 (1805) ; var. multidentata, A. Br. in Journ. Bot. ii. (1864) 

 275 ; var. spinulosa, DC. /. c. ; (?) var. paucidentata, A. Br. 276. 



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