'22i COMMON CANADIAN WILD PLANTS. 



S. KAI'AS, L. Naiad. 

 N. flex'llis, Eostk. and Schmidt. Siems very slender. 

 Leaves very narroVly linear, minutely serrulate. 



3. ZA.NNI€UEL'UA, Michelli. Horned Pondweed. 

 Z. palus'tris, L. Fruit obliquely- oblong, flattish and 

 somewhat incurved. Style half as long as the nutlet. 



4. ZOSTE'UA, L. Eel-GBASS. Grass-whack. 

 Z. mapi'na, L. Leaves obscurely 3-5-nerved.— Atl. sea- 

 coast, in shoal water. 



II. PETALOI'DEOUS DIVISION. 



Flowers with a perianth coloured like a corolla. 



Order XCVIII. ALISMA'CE.ffi. (Water Plantain F.) 



Marsh herbs, with flowers having 3 distinct sepajs and 

 3 distinct petals, pistils either apocarpous or separating at 

 maturity into distinct carpels, and hypogynous stamens 6- 

 many. Flowers on scapes or scape-like stems. Leaves 

 sheathing at the base either rush-like or, when broad, mostly 

 heart-shaped or arrow-shaped. 



Synopsis of the Cieiiera. 



* Calyx and cnrolla both greenish. Carpels more or less united, hut 



spreading at tnaturity. Leaves rush-like and fleshy, or 



- grass-Wee. 



1. Trlslo'chln. Flowers small, in a spike or close raceme, without 



bracts. Carpels united to the top ; when ripe, splitting away from 

 a central persistent axis. 



2. ScbeacUze'rla. A low bog-herb, with a creeping jointed rootstock, 



and grass-like leaves. Stamens 6. Carpels S, globular, nearly 

 distinct. 



(These two genera are included in Nafadacese In Macoun's Catalogue.) 



*'^ Calyx green, persistent. Corolla white. Pistil apocarpous. Xieaves 

 with distinct blades and petioles. 



3. Alls'ni.i. Mowers perfect. Stamens usually 6. Carpels numerous, 



in ii. ring. Leaves all radical. Scapes loith ichorled jmnicled 

 branches. 



