CLASS XXI. ORDER I. 357 



cate ; calyx a scale ; corolla none ; anthers four, wilh- 

 ont filaments. Fertile flowers, ament a cone ; calyx 

 scale one flowered ; corolla none; stigmas two ; nut 

 angular. 



399. Thuya. Barren flowers, calyx the scale of 

 an ament ; corolla none; stamens four. Fertile flow- 

 ers, calyx a two flowered scale of a cone ; corolla 

 none; pistils two ; nut one, winged. 



400. AcALYPHA. Barren flowers, calyx three or 

 four leaved; corolla none; stamens about twelve. 

 Fertile flowers, calyx three leaved ; corolla none; cap- 

 sules three grained, three celled ; seeds solitary. 



MONGECIA. 

 MONANDRIA. 



366. NAJAS. 



Najas Canadensis. Mx. Canada Naiad. 



Slender, filiform, smooth ; leaves narrow linear. 

 Syn, Caulinia flexilis. Nult. 



An obscure floating plant with dichotomous stems, and crowd- 

 ed linear leaves about an inch long, serrulate under a magnifier. 

 Flowers minute, axillary, sessile. Fruit ovate, tipped with the 

 three parted style. — In Fresh pond, Mr. Eddy. 



367. CHARA. 



Chara vulgaris. Common Chara. 



Stems and branches naked at base ; branchlets 

 round with leafy joints ; leaves oblong-subulate ; brac- 

 tes shorter than the fruit. 



An immersed plant growing at the bottom of muddy ponds 

 and ditches, with a fcstid smell. Stems numerous, a foot long, 

 slender, brittle. Leaves about eight in a whorl, subulate, acute. 



