32 8 NATURAL HISTORY BULLETIN. 



Rare in the eastern part of the state, sandy margins of 

 streams and ponds; variable. 



Keokuk, Ehinger ; Oquawka, Ills., Patterson; Fruitland, 

 Muscatine county, a form more slender than the type in wet 

 soil. Also from Moscow, a lower, very densely tufted form 

 with minutely papillose-hairy leaves, the spikelets oblong, 

 about 3 lines long, the akene larger. Barnes & Miller. 



Note. — F. castanea (Michx.) Vahl, Enum., n, 292 (1806), (F. spadtcea var. 

 castanea Torr.) was collected on the Mississippi bottoms near Oquawka, 111., 

 Aug., 18S4, by Mr. H. N. Patterson, and probably occurs on the Iowa side 

 of the river. It is also reported from Nebraska and Missouri. 



SCIRPUS L. Sp. PI., 47 (1753). 



A large genus of annual or perennial sedges, our species 

 varying in height from a few inches to eight or ten feet. 

 Stems leafy in all the Iowa species except S. lacustris L. 

 where they are reduced to basal sheaths. 



Species about 200; 35 or 40 in the United States. 



Illus. Flora, 28; Gray's Man., 6th ed., 17; Arthur, Fl. Iowa, 6; MacMillan, 

 Metas. Minn. Val., 5; Tracy, Fl. Mo., 9; Brendel, Fl. Peoriana, 3; Web- 

 ber, Fl. Neb., and Rep. i-iv, 9; Williams, Grass and For. PI. Daks., 5; 

 Fink, Fl. Fayette, Iowa, 2. 



1. S. hallii A. Gray. Man., 2nd ed., Add. (1863.) 



.S". supinus var. hallii A. Gray. Man., 5th ed., 563 (1867). 

 Illus. Flora, 1, 264, fig. 615; Gray's Man., 6th ed , 580; Tracy, Fl. Mo., 92; 

 Brendel, Fl. Peoriana, 88. 



A low, tufted annual, growing in wet soil, and very rare 

 within our limits. Not before reported from Iowa. 



Muscatine county, Refpert. I am indebted to Mr. Wm. 

 D. Barnes of Blue Grass for his single specimen for examina- 

 tion. 



2. S. americanus Pers. Syn., 1, 68 (1805). 



S. triangularis (Pers.), MacMillan, Metas. Minn. Val., 99 (1892). 

 S. fungens Vahl. Enum., u, 255 (1806). 

 Illus. Flora, 1, 255, fig. 618; Gray's Man., 6th ed., 579; Arthur, Cont. Fl. 

 Iowa, vi; Hitchcock, Pl.||Ames, 523; MacMillan, Metas. Minn. Val., 99; 

 Tracy, Fl. Mo., 92; BrendelJ Fl. Peoriana, 62; Bruhin, Fl. Wis., 278; 

 Webber, Fl. Neb., 99; Rydberg, Fl. Bl. Hills, S. I)., 526. 



