Naias.'] olxx. NAiADAOEai. (J. D. Hooker.) 569 



to the iuner perianth, apiculate or cuspidate, 1-4-celled. Fern, perianth 0, 

 or hyaline and adherent to the carpel. Oa/rpel 1, sessile, l-ovuled ; stigmas 

 2-4, slender ; ovule basilar, erect, anatropous. Achene oblong. Seed 

 erect, testa very thin ; embryo straight. — Species about 10, temperate and 

 tropical. 



The Indian species of this genus require a very close examination, which I regret 

 to say I hare not materials in flower and fruit sufficient to enable me to undertake. 



1. N. major, All. Fl. Pedem. ii. 221; stem terete toothed, leaves 

 linear almost pinnatifidly toothed, teeth triangular, base hardly dilated, 

 flowers solitary, anther 4-celled. KuntA Enum. iii. 112 ; Nees Qen. Fl. 

 G-erm. iii. t. x. ; in Linnsea, ix. t. 7, and x. t. 1 ; Boiss. Fl. Orient, v. 

 27. N. fucoides. Griff. Noful. iii. 184; Ic. PI Asiat. t. 251, f. 1. N. 

 murioata, Bel. Fl. Egypt. 281. N. spinosa. Ham. in Wall. Gat. 5182. 



Throughout India, in fresh and brackish water, ascending to 8000 ft. in Western 

 Tibet. Oetlon. — Distbib. Europe, Asia, Africa. 



Btem terete, branched. Leaves J-li in., teeth 4-8 on each side, dorsally spinous ; 

 sheath with rounded entire sides. Flowers dioecious ; invol. of male oblong, 2-3- 

 toothed. Carpel oblong, stigmas 2-3, filiform. Achene -j^-i in. 



2. IT- graminea, Del. Fl. Fgypt. 282, t. 50, f . 3 ; leaves narrowly 

 linear or subulate acuminate flaccid acntely many-toothed, basal auricles 

 erect lanceolate toothed on both margins, flowers fascicled monoecious, 

 anthers 4-celled. KuntA Fmirn. iii. 11 5 ; Boiss. Fl. Orient, v. 28 ; A. Brawn 

 in Seem. Journ. Bof. ii. (1864) 278, f. 5. IST. seminuda, Griff. Notul. iii. 

 184 ; Ic. PI. Asiat. t. 251, f. 2, and t. 253, 254. jST. semistipula, Balb. Fl. Ticin. 

 t. 16. Oaulinia alzanensis, Pollin. Fl. ¥&ron, iii. 49. Fluvialis indica, 

 Pers. ex Wall. Cat. 5183 B. 



Throughout India in still fresh water, and Ceylon. — Distkib. the Old World 

 generally. 



Stem 1-2 ft. Leaves f -1 in., usually whorled, broader, more transparent and 

 more acutely toothed than is N. minor. 



3. JSt. minor, All. Fl. Pedem. ii. 221 ; leaves very narrowly linear 

 remotely toothed basal auricles rounded or truncate toothed rarely acute 

 and entire, flowers fascicled monoecious, anther 1-celled. Kwnth Fnum. iii. 

 113 ; Nees Gen. Fl. Germ. iii. t. x. ; Boiss. Fl. Orient, v. 28. N. dichotoma, 

 Boxb. Fl. Ind. iii. 749. N, ternata, Boxb. ex Griff. Notul. iii. 183 ; Grif. 

 Ic. PI. Asiat. t. ^5% N. indica, CTowK.. i» jKmB««, iv. 501. Caulinia indica, 

 and fragilis, Willd. in Mem. Acad. Berl. (1798) 89. C. indica. Wall. Gat. 

 5183, in part. 



Throughout India and Cetlon, in still sweet water. — Distbib. Old World 

 generally. 



Stem very slender, much branched. Leaves spreading, or the upper recurved, 

 i in. or less, hardly Jg in. broad, green or brown when dry. — There may be two 

 or more species in India under the above name. The other plant under Wallioh's 

 5183 is a Chara. 



4. JS. falciculata, A. Braun in 8eem. Journ. Bot. ii. (1864) 278, f. 4 ; 

 stem rigid, leaves as in JV. minor, but auricles falcately incurved entire or 

 the inner margin entire the outer toothed. 



Madbas ; at Tuticoreen, Wighi. — Distbib. Philippine Islands. 



I greatly doubt this being distinct from N. minor, amongst numerous specimens 

 of which I find some with basal auricles very like those figured by Braun as/alci- 

 eulata. 



