384 MONOCOTYLEDONOUS PLANTS. . 



ORDER CXXXVH. FLUVIALES. Lind. 



Flowers monoclinous or diclinous. Perianth 2- or 4-part- 

 ed, often deciduous, rarely wanting. Stamens definite, hypo- 

 gynous. Ovaries 1 or more, superior ; ovule solitary ; style 

 1 or none ; stigma simple. Fruit dry, not opening, 1-celled, 

 1-seeded. Seed pendulous ; albumen none ; embryo straight 

 or curved, with a lateral cleft for the emission of the plumule. 



Water, plants. Leaves very cellular, with parallel veins. 



1. ZOSTER A. Linn. 



Stamens and pistils separated, inserted in 2 rows upon one 

 side of a spadix. Spathe foliaceous. Perianth none. STE- 

 RILE FL. Anthers ovate, sessile, alternating with the germs, 

 and upon the same spadix. FERTILE FL. Ovary 1, ovate. 

 Style bifid. Drupe 1-seeded. Monoecia. Monandria. 



Z. marina Linn. : leaves entire, somewhat 3-nerved ; stem roundish. 



HAB. Muddy shores. N. Y. to Car. -Aug. U.Stem terete, 



flexuous, throwing out roots from tfle joints. Leaves very long 



and narrow. Spadix linear, with Ihejftowers all on one side, in 



2 rows. 4 Grassfwrack. 



2. CAULINIA. WiUd. 



Monoecious. Perianth none. STERILE'FL. Anther ses- 

 sile. FERTILE FL. Style filiform. Stigma bifid. Cap- 

 sule 1-seeded. Monoecia. 'Monandria. 







1. C.fragUis Willd. : leaves ternate or opposite, linear-subulate, re- 

 curved, aculeate-dentate, rigid. 



HAB. In water. Penn. Aug. Q.Stem long, submerged. 

 Flowers small. 



2. C. Jtexilis WWd : leaves whorled in sixes, linear, denticulate at- 

 the apex, spreading. 



HAB. Ponds and ditches. N. Y. to Car. Aug. fj).Stem I 2 

 feet long, submerged, branching, jointed. Flower solitary, axil- 

 lary, sessile. 



3. ZANiMCHELLIA. Linn. 



Monoecious. STERILE FL. Perianth none. Stamen 1. 

 FERTILE FL. Perianth single, of 1 leaf. Ovaries 4 or more. 

 Style. 1. Stigma peltate. Capsule sessile. . If 



Monoecia. Monandria. 



1. Z. palustris Linn. : anthers 4-celled ; stigmas entire ; pericarps 

 toothed on the back. 



