2 RANUNCULACEAE. 



* Involucre forming a rap: carpels in a globular head, with lonj psrslstent plu- 

 mose styles. 



A. patens nuttalliana Gray. Pasque-flower. Stem 4-10 inches high, vill- 

 ous; flowering before Leafing; leaves ternately-partcd, the divisions dissected 

 into narrow linear lobes; involucral lobes linear; peduncle solitary, lengthen- 

 ing after flowering; flower large; sepals 5-7, ovate, whitish or purplish. High 

 prairies; March-May; once common, becoming scarce as the prairies are bro- 

 ken up. Winneshiek, Allamakee, Fayette, Delaware, Story, Hardin, Emmet, 

 Lyon, Woodbury, Calhoun, Crawford, and Shelby counties. ( Pulsatilla ltirsn- 

 tlsslma ( Pursh ) Britton. ) 



* * Styles short, not plumose. 

 t Leaves of the involucre 3, sessile. 



A. pennsylvanica L. Stem 1-2 feet high, hairy; radical leaves 5-7-parted 

 or cleft, divisions cut or toothed toward the apex; primary peduncle naked, 

 two lateral ones with a 2-leaved involucre; sepals 5, obovate, white; achenes 

 in a globose head, flat, nearly orbicular, pubescent. Low places; June-Ju- 

 ly; common. (A. canadensis L. ) 



f f Leaves of the involucre long-petioled; sepals 5-8, usually silky beneath. 



A. cylindrica Gray. Stem 1-2 feet high, silky-pubescent; flowers 2-0, on 

 exserted naked peduncles, sometimes one involucellate; involucral leaves 4-18, 

 3-divided, the divisions cuneate-lanceolate, cleft, toothed toward the apex; 

 head cylindrical, 1 inch long-; achenes pubescent. Prairies and woods; June- 

 July; common. 



A. virginiana L. Stem 2-3 feet high, pubescent; involucral leaves 3, 3-part- 

 ed, the divisions ovate-lanceolate, cleft and serrate; the first peduncle naked, 

 the later with a 2-leaved involucel near the middle; sepals 5; head of fruit o- 

 val to oblong. Woods; June-August; frequent and widely distributed. 



A. quinqcefolia L. Stem 4-3 inches high, smooth or slightly pubescent, 

 from horizontal rootstocks; involucral leaves 3, leaflets wedge-shaped, con- 

 spicuously toothed, somewhat lobed; sepals 4-7, ovate, white varying to blue 

 or purple. Rich upland woods; April-May; common locally; Winneshiek, 

 Fayette, Scott, Muscatine, Johnson, and Story counties. ( A. nemorosa L. of 

 Gray's Manual. ) 



* * * Involucre far below the llower. 



A. caroliniana Walt. Stem 3-8 inches high, pubescent, from a small tu- 

 ber; root-leaves 3-parted or cleft; sepals 6-20, linear, purplish varying to whit- 

 ish. Dry soil, open places; April-May; infrequent; Fayette, Scott, Musca- 

 tine, Stcry, Hardin, Hancock, and Sioux counties. 



h[EFAT!CA Scop. Low perennial scapose herbs, with thick heart-shaped 

 3-lobed radical leaves and solitary flowers. Stamens many; filaments short; 

 anthers 2-celled. Invctucre 3-leaved, close to the flower, calyx-like. 



rj. acutiicba DC. Scapes 4-8 inches high, villous; leaves thick, evergreen, 

 3 lebed or sometimes 5-lobed; leaf-lobes and those of the involucre acute or 

 acutish; tlowei s bine, purple, or white. Upland woods: March-April; com- 

 mon in the eastern half of Iowa, but apparently rare in the western portion. 

 < //. acuta ( I-ursh ) Britton. ) 



|-|. triloba Chnix. Lobes of leaves and involucre rounded or obtuse. A 

 species closely resembling the proceeding. It has been reported from Scott 

 county, and various other localities but there is much doubt as to whether it 

 belongs to our flora. I //. hepatlcti ( L. ) Karat. ) 



ANEMONELLA Spach. Leaves 2-3-ternately compound; involucral leaves 







