General Key to the Families 



SUBDIVISION II. ANGIOSPERMJE 



CLASS I. MONOCOTYLEDONE^: 



ORDER V. PANDANALES 

 VIII. TYPHACE^. CAT-TAIL FAMILY 



Aquatic or marsh herbs with creeping rootstocks ; leaves nerved, 

 linear, sessile; flowers monoecious, numerous on a spadix destitute 

 of proper floral envelope; fruit nut-like, usually splitting on one 

 side. 



I. TYPHA. (Tourn.) L. 



i. T. latifolia. L. Broad-leaved Cat-tail. 



IX. SPARGANIACELflE. BUR-REED FAMILY 



Marsh or aquatic herbs' with erect or floating stems; leaves 

 alternate, linear, sessile, two-ranked; flowers monoecious with in- 

 globular, sessile or pedunculate heads; fruit nut-like, obovoid or 

 spindle-shaped. 



I. SPARGANIUM. (Tourn.) L. 



i. S. simplex. Huds. Simple-stemmed Bur-reed. 



ORDER VI. NAJADALES . 

 X. NAJADACE^:. PONDWEED FAMILY 



Marsh or immersed aquatic herbs with slender, jointed, leafy 

 stems; leaves flat or filiform, sheathing at the base; flowers perfect 

 or unisexual with a perianth of four or six distinct valvate or 

 tubular segments; fruit an indehiscent berry. 



I. POTAMOGETON. (Touril.) L. 



1. P. Richardsonii. (Benn.) Rydb. Richardson's Pond- 



weed. 



2. P. filiformis. Pers. Filiform Pondweed. 



