168 NATURAL HISTORY BULLETIN. 



and extent of distribution, and is found in similar habitats. 

 It begins to fruit in June. Specimens from the following 

 counties are in the herbarium: Lee (June, 1897, sterile) ; 

 Louisa {P. C. Myers, Aug., 1897) ; Muscatine (E. Reppert, 

 July, 1894); Johnson {T. H. Macbride, 1883; Shimek\ 

 Sept., 1895); Jones {T. H. Macbride, Aug., 1895; J. E. 

 Cameron , June, 1895, young fruit) ; Delaware {J. E. 

 Cameron, Sept., 1897, young fruit); Black Hawk (July, 

 1898, young fruit) ; Allamakee (T. H. Macbride, August, 

 1893; T. E. Savage, June, 1899, young fruit); Cerro 

 Gordo (July, 1896, sterile) ; Emmet (R. I. Cratty, no 

 date); Webster (July, 1897, sterile); Calhoun, (G. B. 

 Rigg, July, 1895, sterile); Polk {piepi/s of E. Des Moines 

 High School, no date); Adair (J. E. Gow, Aug., 1900); 

 Pottawattamie (J. E. Cameron, June, 1897, young fruit) ; 

 Shelby (T. J. Fitzpatrick, June, 1894, young fruit). 



Class III. HYDROPTERIDES Will 

 denow, Sp. PL, vol. v, p. xxxxu. 



Order I. MARSILEACEAE R. Br., Prod. Fl. N. Holl., 

 p. 166 (1810). 



Genus MARS I LEA L., Sp. PL, vol. II, p. 1099, 



(1753). 



Marsilea vestita H. & G. 



This species was reported from Iowa by Arthur (/. c.), 

 but no known specimens were extant in Iowa herbaria. In 

 July, 1899, the writer re-discovered the species in the 

 northwestern corner of Lyon county.* The specimens 



*Reported in Rep. Iowa Geol. Sur., vol. x, p. 180, (1900). 



