134 NATURAL HISTORY BULLETIN. 



/aria Prantl, in Engl. & Prantl, Nat. Pfl. Fam. 3; Abt. 2, 

 63, 1891. 



A species closely resembling those of the genus Ranun- 

 culus but distinguished by the longitudinally striated 

 achenes. The habitat is wet prairies and sandy shores, the 

 flowers appearing in June, July, and August. The range 

 of this species is from Labrador to New Jersey west along 

 the St. Lawrence river and Great Lakes to Minnesota and 

 Northwest Territory. Within our limits this species ap- 

 pears to be confined to the northwest. Our specimens are 

 from Dickinson, Emmet, and Lyon counties. Prof. Bes- 

 sey reports the species from Story county and Prof. Pam- 

 mel from Lyon county. The University herbarium con- 

 tains in addition, specimens from several other northern 



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, 1876; Hitch- 

 cock, Trans. St. Louis Acad, of Sciences, vol. 5, p. 483; Pammel, Proc. 

 Iowa Acad, of Sciences, vol. 3, p. Ill; Fitzpatrick, Manual of the Flow- 

 ering Plants of Iowa, p, 5. 



THALICTRUM L. Sp. PL 545. 1753. 

 Thalictrum dioicum L. Sp. PI., p. 545. 1753. 

 Early Meadow-Rue . 



Perennial, stem 1-2 feet high, glabrous; leaves alternate, 

 3-4-ternate, petioled; leaflets drooping, 3-9-lobed, rounded, 

 thin, pale beneath, stalked; flowers dioecious, purplish or 

 greenish, in an elongated panicle which is laterally corym- 

 bose or umbellate ; sepals 4 or 5 ; petals none ; stamens 

 many, exserted, filaments shorter than the anthers; stigma 

 elongated; achenes ovoid, sessile or minutely stipitate, 

 deeply grooved, much longer than the style. 



This species is frequent in upland woods and meadows, 

 flowering in April and May. Within our limits it seems to 

 be found mostly in the northern half of the state though it is 

 found in Missouri and Alabama to the southward, and ex- 

 tends eastward to Labrador and northwestward to the Sas- 

 katchewan. 



The only specimens in our herbarium were collected in 



