130. NAIADACE^. [4. Zannichelha. 



Behar, affluents of the Soane. J.D.II. ! Patna, U'aH. Cat . 5170 b, part ! Tirhut 

 and N. Bengal (fide Beng. PL), but I can find no specimens in the Cnl. Herb. Fl. 

 Nov.-Jan. It is' frequent in ponds and streams as far as the British Isles. 



C. p. pusillus, L. 



Much 2-chotomously branched with very filiform stems. Very like 

 P. pectinatus but leaves flat without inroUed margins, filiform, 1-3- 

 nerved. Stij)ules free. Peduncle long filiform. Flowers and flower- 

 clusters very minute. Drupels turgid obliquely ovoid with a broad 

 dorsal keel. 



Patna, Ha„iiUon, in Wall. Cat.. No. 5180 i ! 



Sub.-sp. fiabellatiis with :3-5-nerved leaves 'OS" broad is recorded in F.B.I, and 

 Bengal Flcintg. This is a slip; that part of IJ'allich'g No. 5179 6 which isfabellatus 

 is from Nalasfola, the other part from Patna is P. pectinatm [P. marinns ? 

 Hamilton). 



P. pugilhis is common in the British Isles and forms "a tangled mass of 

 thread-like stems and dull, olive-green leaves with numerous spikes of brownish 

 flowers which are either submerged or partiallj' rise above the water." Eeo. 

 Joh )is. 



3. RUPPIA, L. 



Slender aquatics growing in brackish water with elongate filiform 

 submerged leaves with stipular sheaths. Flowers minute, 2-sexual, 

 2-6 together within the leaf -sheath, peduncle usually greatly elongating 

 becoming far exserted and often spirally twisted after flowering. 

 Pei-ianth 0. Anthers 2 sessile, opposite, 2-celled with large kidney- 

 shaped cells soon deciduous from the connective. Carpels 4 with 

 sessile stigma. Ovule 1 pendulous. Achenes long-stipitate, ovoid, 

 obtuse or beaked. Seed uncinate. 



1. R. rostellata, Koch. Sjm. R. maiitima sub. sp. rostrata, 31. & K. 



Stems very filiform, branched. Leaves 1-3" long, nerves not evident. 

 Fruiting peduncle of very variable length, often attaining several 

 inches, straight. Achenes with very slender stipes attaining 1" in 

 length, spreading divergent, obliquely ovoid acuteh' beaked. 



In brackish water. No specimens have been collected from our area, but it 

 occurs throughout India and has been collected by Kurz near Calcutta, so that it 

 will almost certainly be found in Orissa. E. maritima, which differs but slightly 

 is frequent in brackish waters in Britain. 



4. ZANNICHELLIA, L. 



Aquatics growing submerged in fresh or brackish water with a very 

 slender rootstock and filiform stem? cymosely branched at the flowering 

 nodes. Leaves narrowly linear or filiform, pseudo-verticillate at the 

 flowering nodes, with stipular membranous sheaths. Flowers minute, 

 moncecious. Female terminal on an abbreviated shoot enclosed in 

 the stipular leaf -sheath and bearing 2 foliage-leaves below it ; one of 

 these bears an axillary male flower, the other a shoot which continues 

 the branching. Male fl. subtended by a spathe (which may be merely 

 the sheath of its leaf: the F.B.I, states that both flowers are included 

 in one spathe) and consisting of a solitary stamen with sagittate 

 anther and slightly excurrent connective. Fem. fl. with a hyaline 

 tubular perianth containing 2-6, rarely more, carpels each with a 

 peltate deflexed large stigma and a pendulous orthotropous ovule. 



849 



