RANUNCUEACEAE OF IOWA. 99 



high, hollow, grooved, stout. Leaves entire or cre- 

 nate, basal leaves long-petioled, cordate or reniform, with 

 a narrow sinus, the upper with shorter petioles and more 

 or less truncate bases. Flowers conspicuous; sepals 5-9, 

 oval, obtuse, yellow, deciduous; petals wanting; stamens 

 many; pistils 5-10; styles obscure; pods compressed, spread- 

 ing, bearing the many seeds in two rows along the ventral 

 suture . 



This species occurs frequently in swamps, wet soil, 

 along banks of streams, flowering in April and May, fruit- 

 ing in May and June. Our specimens are from Winne- 

 shiek, Fayette, Muscatine, Johnson, and Emmet counties; 

 the State University herbarium has specimens from Story 

 and Dickinson counties. Messrs. Nagel and Haupt report 

 the species from Scott county; Prof. Bessey from Floyd 

 and Poweshiek counties; and Prof. Pammel from Wood- 

 bury county. 



Bessey, Contr. to the Flora of Iowa, p. 91, in Fourth Report Iowa Agr. 

 Col. ed. 1872; Arthur, Contr. to the Flora of Iowa, p. 6, 1876; Flora of 

 Floyd county in History of Floyd county, p. 310; Nagel and Haupt, 

 Proc. Davenport Acad. Nat. Sciences, vol. 1. p. 154. Hitchcock, Trans. 

 St. Louis Acad, of Science, vol. 5, p. 483; Pammel, Proc. Iowa Acad, of 

 Sciences, vol. 3, p. Ill; Fink, Proc. Iowa Acad, of Sciences, vol. 4, p. 

 83; Fitzpatrick, Proc. Iowa Acad, of Sciences, vol. 5, p. 108 and p. 135; 

 Manual of the Flowering plants of Iowa p, 5; Barnes, Reppert, and Mil- 

 ler, Proc. Davenport Acad, of Nat. Sciences, vol. 8, p. 201; Britton and 

 Brown, Ills. Flora, vol. 2, p. 51; MacMillan, Met. Minn. Valley, p. 230. 



Isopyrum biternatum (Raf.) T. & G. False Rue 

 Anemone. 



A slender smooth perennial herb, 4-10 inches high; roots 

 many, fibrous, occasionally thickened into small tubers. 

 Leaves ternately decompound. Flowers long-peduncled, 

 axillary or terminal; sepals 5, petaloid, deciduous; petals 

 none ; stamens many ; pistils usually 4 ; pods ovate or ob- 

 long, sessile, 2-several-seeded. Enemion biternatum Raf. 

 Journ. Phys. vol. 91, p. 70, 1820; Isopyrum biternatum 

 T. & G. Fl. N. A., vol. 1, p. 660. 1840. 



This species is very common in moist rich woods, bloom- 



