CYPERACEJ1. 475 



2. Scirpus riparius, Presl. 



S. riparius, Presl, Reliq. Hsenk. 1, p. 192; Kunth, Enum. 2, p. 166. 

 Elytrospermum Californicum, C. A. Mey. Cyp. Nov. in Mem. Acad. St. Petersb 

 (5ser.) 1, p. 200, t. 2. 



Hab. Borders of the Lower Sacramento, California.— Known from 

 the eastern S. validus only by its broad and plumose bristles, or 

 rather plume-like paleae of the perigynium. 



3. Scirpus microcarpus, Presl. 



Scirpus microcarpus, Presl, Keliq. Hsenk. 1, p. 195; Steud. Cyp. p.. 89. 



S. lenticularis, Torr. Cyp. p. 88 ; Steud. Cyp. p. 88 ; Hook. Fl. Bor.-Am. 2, p. 230. 



S. sylvaticus, Bong. Veg. Sitcha, p. 169. 



Hab. Washington Territory and southward, in California, to the 

 Lower Sacramento. — The earlier name of Presl is adopted for this 

 species, which seems to be constant in the characters which dis- 

 tinguish it from S. sylvaticus. 



4. Scirpus maritimus, Linn. 

 Scirpus maritimus, Linn. Spec. ed. 2, p. 74 ; Torr. Cyp. 1. c. p. 323. 



Hab. Puget Sound and Gray's Harbor, Washington Territory. — 

 Extends quite across the Continent in a more southern latitude. 



6. I S L E P I S, B. Brown. 



1. ISOLEPIS CARINATA, Hook. & Am. 



Isolepis carinata, Hook. & Arn., in Torr. Cyp. 1. c. p. 349 ; Torr. Bot. Mex. Bound. 



p. 153. 

 I. hoilolepis, Steud. Cyp. p. 318 (addend.). 



