840 CXLIT. NAIADACEJ;. 



1. Zannichellia palustris, Linn. Sp. PL (1753) p. 969. Sitb-sp. 

 pedicellata, Sijme, Eng. Bot. ed. 3, v. 9 (1869) p. 57, t. 1426. Stems 

 very slender, filiform. Leaves 1-3 in. long, all submerged, alternate or 

 opposite, narrowly linear or filiform. Flowers minute, subsessile, 

 enclosed in the leaf-sheaths. Filament of the male flowers at first short, 

 afterwards elongating. Peduncles in the Siiid specimen (the only 

 specimen from the Bombay Presidency that I have seen) reaching -^ in. 

 long. Achenes distinctly stipitate, about ^ in. long including the beak 

 (which is about half as long as the body of the achene), subz'eniformly 

 incurved, crested on the back. Fl. B. I. v. 6, p. 568 ; Woodr. in Journ. 

 Bomb. Nat. v. 13 (1901) p. 429 ; Prain, Beng. PI. p. 1124. 



Eare. Deccan : Poona, Mula River, Woodrow. Sind : BaheUl Dalzell does 

 not state whether his specimens grew in brackish or fresh water. His specimens 

 merely bear the ticket " Zannichellia Scinde." — Distkib. Salt-marshes and less 

 commonly in fresh water, throughout India ; most temperate and subtropical 

 regions. 



5. NAIAS, Linn. 



Annual submerged herbs growing in fresh or brackish water ; stems 

 rooting from the nodes, branched, filiform, smooth or muricate. Leaves 

 sessile, opposite, alternate or whorled, narrowly linear, sinuate-dentate 

 or serrulate. Flowers minute, axillary, 1-sexual, monoecious (rarely 

 dioecious). Male tlowees : Perianth double, the outer tubular or 

 inflated, entire or 4-fid, the inner hyaline. Stamen solitary, adnate to 

 the inner perianth-tube ; anther apiculale or cuspidate, usually 4 (rarely 

 l)-celled. Female flowers: Perianth 0, or hyaline and adnate to the 

 carpel. Carpel solitary, sessile, 1-ovuhite ; ovule basal, erect, anatropous. 

 Fruit an oblong achene. Seed erect ; testa very thin ; embryo 

 straight. — Distrib. Throughout the world except in Arctic regions ; 

 species 31. 



' 1. Naias minor, All. Fl. Pedem. v. 2 (1785) p. 221. A small 

 plant, growing in fresh water, 1|-10 in. high ; stem slender, much 

 dichotomously branched ; internodes short, smooth. Leaves g-| in. 

 long, scarcely -^q in. broad, narrowly linear, the upper recurved, with 

 G-12 spreading teeth on each margin ; sheaths truncate, rounded. 

 Flowers fasciculate, monfficious, the male and female often found in 

 successive leaf-axils. Male flowers about J^ in. long. Anthers 

 1 -celled. Female flowers about y^y in. long. Style long; stigmas 

 2, unequal. Achenes fV-« in- long. Seed narrowly ellipsoid, ])i(ted. 

 Fl. B. I. V. 6, p. 569 ; Trim. Fl. Ceyl. v. 4, p. 376 ; 'Eendle, in Trans. 

 Linn. Soc. ser. 2, v. 5, p. 410 (1899), & in Engler, Pflanzenreich, v. 4, 

 part 12 (1 901) p. 14 and p. 2, fig. 1, D-F; Woodr. in Journ. Bomb. Nat. 

 V. 13 (1901) p. 429 ; Prain, Beug. Pi. p. 1124. Naias inclica, Cham, in 

 Linnjea, v. 4 (1829) p. 501 ; Dalz. & Gibs. p. 277. 



Peccan ; Poona, Woodnnv. 



This lias been included on the authority of Woodrow, who gives Poona as the 

 habitat of the plant. 1 iiave seen no specimens from Bombay ; there are iU)no in 

 Herb. Kcw. — Di.strir. More or less throughout India in still fresh water; Ceylon, 

 Old World generally. 



