CXLIV. NAIADACE^. 839 



short straight beak. Fl. B. I. v. 6, p. 567 ; Dalz. & Gibs. p. 248 ; Trim. 

 n. Ceyl. V. 4, p. 374; Woodr. iu Journ. Bomb. Nat. v. 13 (1901) 

 p. 429 ; Prain, Beng. PI. p. 1123. — Plowers : Aug. 



Dalzell without locality in Herb. Kew. ! Deccan ; Poena, Woodrow. Gujarat : 



tank at Gogo (Katbiawad) plentiful, Dalzell Sf Gibson. Sind : Jemadar ka Lauda, 



near Karachi, Stocks, 375 ! ; Maucbar Lake, Slacks ! — Distrib. Plains of India, the 

 Himalayas, and Western and Eastern Tibet ; Ceylon, most regions. 



3. RUPPIA, Linn. 



Submerged plants growing in brackish water ; rootstock creeping, 

 much-branched ; stems slender, dichotomously branched. Leaves 

 alternate or subopposite, filiform, formed of two parallel tubes ; sheath 

 elongate, narrow. Flowers minute, hermaphrodite, 2-6 together within 

 a leaf-sheath on an ultimately elongating straight or spirally coiled 

 peduncle. Perianth 0. Stamens 2 ; anthers sessile, 2-celled. Carpels 

 4 ; ovule solitary iu each carpel, pendulous ; stigma peltate. Fruit of 

 4 stipitate ovoid obtuse or beaked achenes. Seed pendulous, uncinate; 

 embryo macropodal. — Distbib. Species 2 or 3, temperate and sub- 

 tropical. 



1. Ruppia rostellata, Koch, ex Relchb. Icon. PL Orit. v. 2 (1824) 

 p. QQ, t. 174, fig. 306. A submerged aquatic herb growing in brackish 

 water, forming tangled masses of filiform leafy flaccid stems and 

 branches ; stems 2 ft. loug or more. Leaves filiform, 2-4 in. long, dull 

 olive-green. Peduncles ^-1 iii- loi^g? not spirally coiled. Flowers 

 minnte, in pairs, enclosed in a leaf-sheath. Stipes of carpels rapidly 

 lengthening after flowering up to 1 in. long, spreading and forming an 

 umbellate head of achenes. Achenes yV- tV ^^- ^o"g» beaked ; endocarp 

 hard. Fl. B. I. v. 6, p. 568 ; Eeichb. Icon. Fl. Germ. v. 7 (1845) p. 10, 

 t, 17, fig. 25 ; Trim. Fl. Ceyl. v. 4, p. 374 ; Syme, Eng. Bot. ed. 3, v. 9 

 (1869) p. 59, t. 1428; Woodr. in Journ. Bomb. Nat. v. 13 (1901) 

 p. 429 ; Prain, Beng. PL p. 1124. ? Zostera marina, Dalz. & Gibs. Bo. 

 Fl. (1801) p. 277 {not of Linn.). 



Stocks without locality in Herb. Kew. ! Konkan : Salt-works at Nathay, Stocks \ ; 

 Mahim near Bombay, Woodrow. — Distrib. Throughout India in brackish water ; 

 Ceylon, Temperate Europe and Tropical Asia. 



4. ZANNICHELLIA, Linn. 



Aquatic submerged herbs growing in braclush or fresh water ; root- 

 stock slender ; stem slender. Leaves linear, with stipular sheaths. 

 Flowers minute, monoecious, both sexes in one membranous sheath. 

 Male flowers : Perianth 0. Stamen solitary ; filament filiform ; 

 anther linear, 2-3-celled. Female elowers : Perianth cupular, 

 hyaline. Carpels 2-9, sessile ; ovule solitary in each carpel, pendulous, 

 orthotropous ; style rather long, slender ; stigma oblique, peltate. 

 Fruit of sessile or stipitate subreniformly incurved achenes usually 

 4 in number. Seed pendulous ; testa thin ; embryo snbcylindric, with 

 the cotyledonary end folded twice on itself. — Distrib. Species 4-5, 

 but probably all forms of one species. 



