RANUNCUEACEAE OF IOWA. 131 



thickened; leaves 3-5-divided, divisions lobed and cleft, 

 the ultimate segments oblong or linear ; petals 5-7, spatu- 

 late-oblong; achenes flat, beaked by a subulate style. 



This species occurs on the prairies and on the wooded 

 hillsides, flowering in early April and continuing until late 

 in May. In the eastern portion of the state it is generally 

 common. Our specimens are from Fayette, Muscatine, 

 and Johnson counties. We have observed the species in 

 Winneshiek and Scott counties. Additional specimens in 

 the State University herbarium are from Henry, Mahaska, 

 Polk, and Pottawattamie counties. Prof. Bessey reports 

 the species from Warren and Des Moines counties. 



Bessey, Contr. to the Flora of Iowa in Fourth Report of Iowa Agr. 

 Col., p. 91, 1872; Arthur, Contr. to the Flora of Iowa, p. 5; Nagel and 

 Haupt, Proc. Davenport Acad, of Nat. Sciences, vol. 1, p. 154; Fink, 

 Proc. Iowa Acad, of Sciences, vol. 4, p. 83; Fitzpatrick, Proc. Iowa 

 Acad, of Sciences, vol. 5, pp. 108 and 135; Manual of the Flowering- 

 Plants of Iowa, p. 3; Barnes, Reppert and Miller, Proc. Davenport 

 Acad, of Nat. Sciences, vol. 8, p. 201. 



BATRACHIUM .S. F. Gray, Nat. Arr. Brit. PI. 

 2: 720. 1821. 



Our species are perennial, aquatic herbs, with alternate, 

 dissected leaves, and solitary, white flowers, which are borne 

 on peduncles opposite the leaves. Sepals and petals 5. 

 Stamens several or many. Achenes oblique, compressed, 

 not margined, nearly or quite beakless, transversely wrinkled. 

 An assemblage of plants distinguished from Ranuncuhis 

 by their white flowers and transversely wrinkled achenes. 



Batrachium trichophyllum (Chaix) Bossch. Water 

 Crowfoot. 



Stem about one foot high; leaves 1-2 inches long, peti- 

 oled, flaccid, divided into capillary divisions, collapsing 

 when withdrawn from the water; petals ovate, twice as 

 long as the calyx, white; head of fruit small, globose; 

 achenes apiculate. Ranuncuhis trichophyllus Chaix in 

 Vill. Hist. PI. Dauph., vol. 1, p. 335, 1786; Batrachium 



