198 MONCECIA TRIANDRIA. 



266. SPARGANIUM. 



1. $ ramosum, leaves triangular at the base, with concave 

 sides ; common flower-stalk branched ; stigma linear. (Stem 2 

 or 3 feet high ; leaves sword-shaped.) Branched Bur-reed. 



Hob. Ditches and ponds. July, Aug. If 



2. S. simplex, leaves triangular at the base with flat sides ; 

 common flower-stalk simple ; stigma linear. (Less than the pre- 

 ceding.) Unbranched Bur-reed. 



Hob. Sides of the Lough on Holy Island, sparingly ; more 

 plentiful in the pond above Spindlestone. July, Aug. "?/ 



267. CAREX. 



* Catkin solitary, simple. 



1. C. dioica, catkins simple, dioecious; fruit ovate, ribbed, as- 

 cending, finely serrated at the edges ; root^creeping. (Stem a 

 span high, smoothish.) 



Hab. Spongy bogs, common. Castle hills, &c. May, 

 June, if 



2. C. pulicaris, catkin simple, florets in the upper half barren, 

 in the lower fertile ; fruit spreading, deflexed, polished, tapering 

 at each end ; stigmas 2. (Stem a span high, smooth.) 



Hab. Bogs frequent. Castle hills. Boggy field below 

 the Old Lamberton Toll. Lamberton Moor. Long- 

 ridge dean, &c. June. If 



* * Catkins or spikelets aggregate, each composed of barren and fertile 

 florets* Stigmas 2. 



3. C. stellulata, spikelets 3 or 4, roundish, slightly distant ; bar- 

 ren florets inferior ; fruit spreading, with a tapering undivided 

 beak. (Stem 6-12 inches high, triangular.) 



Hab. Marshes in heathy places, common. May, June. 11 



4. C. curta, spikelets about 6, elliptical, slightly distant, scarce- 

 ly bracteated ; scales ovate, membranous, about as long as the 



