4. Zannichellia.] 130. NAIADACE.^. 



Achenes compressed-saiisage-shaped, 2-4, sessile or stipitate, often 

 orenulate spinulose or echinate on the dorsal line and horned with the 

 persistent style. Embryo folded, radicle fold clavate, cotyledonary 

 end tapering slender and twice folded or uncinate. 



1. Z. palustris, L. The Horned Pond-weed. 



A varial)le acjuatic with the characters of the genus. The Indian 

 plant is included in sub-species lyedicellaia Hook. f. (Sjai. Z. pedun- 

 culata, Reichb., and Z. i^exlicillatay Ham.) Male pedinicle short, 

 achenes 2-4, subsessile, back crenate or tubercled, style as long as 

 the body of the achene or longer. 



Behar. J.B.H. ! Fl. c.s. 



In the Behar plant the flowers are sessile, achenes stipitate, smooth or tubercled 

 dorsally or ventrally or both, style very lonof. 



The plant extends to Britain and it is from British specimens that I have some- 

 what modified the pfeneric characters given in the F.B.I. 



5. NAIAS, L. 



(Or Xajas.) 



Slender submerged aquatic herbs with a slender creeping root and 

 usually filiform branched stems. Leaves opposite alternate or 3- 

 nately Avhorled, linear, usually serrulate or sinuate-dentate, base 

 shortly sheathing. FloAvers minute, axillary, moncecious or dioecious. 

 Male perianth double, an outer tubular or inflated entire or 4-fid tube 

 and a hya-line inner. Stamen 1, adnate to the inner, central, apiculate 

 or cuspidate, 1- or 4-celled. Fem. perianth or hyaline and adherent 

 to the carpel which is solitary sessile with 2-4 slender stigmas. Ovule 

 1 basal erect anatropous. Fruit an oblong achene. Seed with thin 

 testa and straight embryo with large hjqiocotyledonary axis and 

 radicle and well-developed plumule. 



The key and greater part of the descriptions have been taken from Rendle. 



A. Flowers dioecious, L. "I-'IS" wide, strongly toothed . . .1. major, 



B. Flowers monoecious. Leaves under "l" wide, teeth very small : — 



1. Fls. of both sexes surrounded by a spathe 2. u/rliea. 



2. Fls. of male only with a spathe. Leaf-sheath truncate or 



auricled at mouth :— 

 a. Anthers 1-celled:— 



Areoles of testa broader than long (scalariform) . . .3. minor. 



Areoles of testa isodiametric 4. Kurziana. 



h. Anthers 4-celled .5. foveolafa. 



3. Fls. of both sexes naked G. graminea. 



1. N. major, All. 



A stout species with the leaves -l-'lo" wide almost pinnatifidly 

 toothed, teeth 4-8 each side triangular. Sheath with rounded entire 

 sides. Flowers dioecious. x\nt)iers 4-celled. 



There are no specimens from our area, but it is said to be found everywhere in 

 both fresh and brackish water, and is likely to occur in Orissa. 



2. N. indica, Cham. Svn. N. minor F.B.I, (in part) ; N. minor var. 



indica, .4. Br., and N. tenuis, A. Br. (The Behar Plant.) 

 A very slander lax aciuatic with filifor)n stems and filiform or very 

 narrowly linear often setaceous leaves •9-1-3" long with very fine 



8.50 



