TRrANDRIA.— MONOGYNIA. 4 1 



M. S. spadiceus: culm compressed, nearly naked ; um- 

 bel terminal ; involucrum rigid, 2-leaved, one of 

 the leaves longer than the umbel ; leaves subterete : 

 spikes ovate-oblong, terete. 

 IIAEL Salt marshes. Aug. If.. Cespitose, tenacious : 

 2 ft. high ; culm compressed above; spikes sub- 

 eylind.y brown. 



35. SCHOENUS, Bog-rush-. Cyperoidew. 



S. mariscoides : culm terete, or a little sulcate, 

 leafy ; leaves channelled, semiterete ;- umbel 

 terminal ; fascicles of spikes 8 on each peduncle . 

 seed naked, rounded at the base. 



I1AB. Bogs. July. V-. Culm 2 ft. high; fascic. 

 about 12-spiked ; spikelets lanceolate ; glum, ovate. 



3G. RHYNCHOSPORA. Cyperoidew. 



1. R. alba : spikes in corymbose fascicles ; culm trian- 

 gular above ; leaves setaceous ; seed somewhai 

 lenticular ; bristles about 10. 

 11AB. Bogs and swamps July — Sept. If. Fasc. 

 axill. and terminal, bracteatc ; glum, white ; seed sub- 

 stipitate. 



I. li.fusca: culm triquetrous ; leaves linear, carinate , 

 fascicles of spikes alternate, pedunculate ,\ spikes 

 ovate ; glumes ovate, brown ;. seed ovate, with an- 

 acute black tubercle. 

 H.AB. Bogs. If. Culm 2 ft. high; glum, mucronate 

 seed brown, rugose. 



>. R. glomerata : spikes in corymbose fascicles, very- 

 distant, by pairs ; culm obtusely triangular ; leaves 

 flat ; seed obovate-cuneiform, very smooth, as long 

 as the tubercle. 

 1IAB. Swamps and bogs. July — Sept. Culm leafy, 

 leav. carinate; spik. lat. and-tp.rm. : glum, brown,. 



f. R. capillacca • spikes 3. — 5, nearly terminal ; culm 

 triquetrous, somewhat leafy ; leaves setaceous ; 

 seed stipitate, a little rugose. 

 HYB.. Sandy swamps. July. If. Jl span high, 

 glum, brown ; bristles 6, longer than the seed. 



i. R. sparsa: culm triquetrous, leafy ; corymbs axillary 

 and terminal, compound, loose 1 peduncles capillary , 



ft 2 



