Rhode Island Plants. 13 



851. E. Robbinsii, Oakes in Hov. Mag. First discovered in 

 this State by Mr. George Thurber, in Spectacle Pond, Grans- 

 ton ! Since found in North Providence, and Smithfield ! 



852. Scirpus subterminalis, Tow. Cyp. p. 317. In ponds, 

 Rhode Island ! 



853. S. debilis, Pursh. Muhl. Gram. p. 34. Big. FL Bost. 

 ed. 2, p. 21. Torr. Cyp. p. 320. Borders of ponds and rivulets, 

 Rhode Island ! 



639. S. lacustris, Linn. Muhl. Gram. p. 32. Torr. Cyp. 

 p. 321. S. acutus, Muhl. Gram. p. 33. Big. Fl. Bost. ed. 2, 

 p. 31. Ponds and swamps, Rhode Island ! 



637. S. triqjjeter, Linn. Muhl. Gram. p. 33. Torr. Cyp. 

 p. 322. S. Americanus, Pers. Big. Fl. Bost. ed. 2, p. 21. S. 

 pungens, Vahl. Wet meadows, fresh and salt, Rhode Island ! 



854. S. Olneyi, A Gr. in Bos. Jour, of Nat. Hist. Culm 

 triquetrous winged, leafless, 2-7 feet high, base sheathed, 

 bearing 6-12 sessile ovate oblong spikes near the apex, and 

 from thence ending abruptly in a triangular subulate point ; 

 scales orbicular mucronate ; anthers barbed at the apex ; style 

 bifid ; bristles 6-retrorsely hispid ; achenium obovate plano- 

 convex gibbous at the apex s carcely eq ual. Salt marsh, See- 

 konk river ! First discovered in 1844, and communicated to 

 Prof. Gray early in July, 1845. Also found by my friend Dr. 

 Knieskern, on the banks of Tom river, New Jersey, and com- 

 municated to Dr. Torrey the latter part of July, 1845, without 

 being aware of its previous discovery. Readily distinguished 

 by its remarkably three-winged stem. 



638. S. maritimus, Linn. Big. Fl. Bost. ed. 2, p. 21. Torr. 

 Cyp. p. 323. Salt marshes, Rhode Island ! 



fi.fluviatilis, Torr. Cyp. p. 324. Brackish water, Rhode 

 Island ! This variety has very much the appearance of a dis- 

 tinct species. 



855. S. atrovirens, Muhl. Gram. p. 43. Torr. Cyp. p. 325. 

 " Scarcely distinct from our European S. sylvaticus." Hook. 

 Fl Bor. Am. II. p. 30. Marshes, Rhode Island ! 



856. S. (Trichophorum) Eriophorum, Michx. Big, Fl 





