■jaq NATURAL HISTORY BULLETIN. 



of the next species, Fitzpatrick; Poweshiek county, 1885, JSFor- 

 ris, and 1886, Johnson; Granite, Lyon county, June, 1897, a 

 form approaching the next species, and Keokuk, June 1, 1897, 

 a very slender form with smooth peryginia, Shimek ; Ames, 

 May 22, 1877, Arthur. 



13. (J. aristata R. Br. Rich. Bot. App., 751 (1823). 



(i. trichocarpa var. aristata Bailey, Bot. Gaz., x, 293 (1885). 

 Illus. Flora, 1, 302, tig. 703; Gray's Man., 6th ed., 598; Hitchcock, PI. Ames' 

 524, and Bull. Torr. Club., xvi, 70; Mac Mil Ian, Metas. Minn. Val., 124; 

 Tracy, Fl. Mo., 92; Bruhin, Fl. Wis., 280; Williams, Grass. & For. PI. 

 Daks., 42. 



Margins of ponds and streams; probably throughout the 

 state but not common. This and the preceding species seem 

 to run together. 



Emmet county, 1878, Crafty: Story county, Hitchcock: 

 Hamilton county, 1884, Rolfs: Johnson county, 1894, Fitz- 

 patrick: High Bridge, Dallas county, July 6, 1897, and Keo- 

 kuk, June 1, 1897, Shimek. The latter approaches the pre- 

 ceding species. 



14. C. riparia W. Curtis. Fl. Lond., iv, PL, 60 (1821). 



Illus. Flora, 1, 303, fig. 704; Gray's Man., 6th ed., 598; Arthur, Cont. Fl. 

 Iowa, iv; Hitchcock, PI. Ames, 524: MacMillan, Metas. Minn. Val., 

 124; Tracy, Fl. Mo., 94; Brendel, Fl. Peoriana, 63; Bruhin, Fl. Wis, 



2S0. 



Sloughs, probably throughout the state, but not very plenti- 

 ful. The perigynia dark colored and polished at maturity. 

 So far as I have observed this species it rarely flowers or 

 fruits. 



Grinnell, 1877, Jones; Emmet county, 1878, Cratty ; Rich- 

 land tp., Jasper county, May, 1886, Johnson; Story City, 

 June 7, 1897, No. 422, Pammel & Beyer. 



15. C. shortiana Z?ew. Am. Jour, Sci., xxx, 6o( 1836) . PI. II. 



Tllus. Flora, 1, 303, fig. 706; Gray's Man., 6th ed., 596; Tracy. Fl. Mo., 94; 

 Brendel, Fl. Peoriana, 62; Webber, Fl. Neb., 9S. 



Rare in moist woods and thickets, eastern part of the state. 

 Not before reported from Iowa. A very distinct species. 



