4 Crowfoot Family. 



oblong <>r Linear; petals 5-7, spatulate-oblong; achenes flat, beaked by a subu- 

 late style. Prairies and wooded hillsides; April-May common; Winneshiek. 

 Fayette, Scott, Muscatine, Henry, Johnson, Polk, Mahaska, and Pottawattomie 

 counties. 



R. septentriona.'is Poir. Low, 6-20 iuehes high, pubescent, erect or in 

 wei places mostly procu mbent and forming- runners, roots many, fibrous; 

 leaves netioled. 3-divided; the divisions usually all stalked, 3-cleft or -divided. 

 the segments toothed or cut; achenes margined, tipped by a sword-shaped 

 style of about their length. Moist soil; April-May: common in all portions of 

 t lie state. 



R. repens L. Habit and foliage closely resembling the preceeding; leaves 

 often white-spotted: achenes margined : the beak stout, short, and slightly 

 bent. Low grounds: May-July: Muscatine and Johnson counties. 



R. recurvatus Poir. Hooked C. Stem 1-2 feet high, hirsute, leaves all sim- 

 ilar, loug-petioled, broadly reniform, deeply 3-cleft, the divisions toothed and 

 lobed beyond the middle; flowers small, on long peduncles; calyx refiexed; 

 petals shorter; achenes compressed, tipped by a recurved beak which is half 

 their length. Woods; May-June; Scott, Muscatine, and Johnson counties. 



R. pennsyivanicus L. f. Bristly ('. Annual; stem 1-2 fee»t high, branch- 

 ing, bristly hairy, leaves ternately compound; divisions frequently 3-cleft, 

 the lobes lanceolate, cuneate, cut or toothed; flowers small; calyx refiexed: 

 head of fruit oblong; achenes tipped by a sharp beak one-third their length. 

 Wet soil; June-August, infrequent; Winneshiek, Allamakee, Scott, Muscatine, 

 Henry, Linn, Story, Emmet, Cerro Gordo, Hancock, Dickinson, Winnebago, 

 and Woodbury counties. 



R. hispidus Hook. HispidC. Resembles the preceeding; annual or bienni- 

 al: ascending or declined, hairy or somewhat hispid; stems 1-2 feet long, 

 rarely rooting: leaves 3-divided, leaflets petioiate, ovate or broadly oblong, 

 cuneate, mostly 3-parted or -cleft, or variously lobed or cleft, somewhat tooth- 

 ed; head of fruit oblong; achenes smooth, the sharp straight beak about one- 

 fourth their length. This species has been confused with R. pennsylvanieus L. 

 and R. scptentirkmalis Poir.; probably frequent; Payette county. ( Ft. macounii 

 liritton. ) 



R. bulbosus L. BuUbOUS C. Stem about 1 foot high, from a bulbous base: 

 radical leaves 3-divided, lateral divisions sessile, the terminal stalked and im- 

 parted, all more or less cleft and toothed: calyx refiexed; petals much longer: 

 bead of fruit globose; achenes compressed, short beaked. Pields and waste 

 places; May-July; reported as an Iowa weed 



R. acris L. Tall C. Stem 2-3 feet high, hairy; leaves of 3 sessile divisions, 

 the basal 3-7-divided, the divisions 3-cleft or -parted, the segments cut into 

 narrow or linear lobes; petals obovate, 2-3 times longer than the calyx; hsad 

 of fruit globose; achenes compressed, short beaked. Pields and waste places; 

 June August; infrequent; Jones, Story, and Page counties. 



I | Root-leaves frequently w<.divided\ roundish, sometimes lobed or cleft. 



P. abortivus L. Small flowered C. Biennial, conspicuous by having the 

 primary root-leaves round, heart- or kidney-shaped, obscurely crenate and 

 long-petioled, other leaves 3-5-lobed or -parted and variously toothed, petiol- 

 ed or nearly sessile; flowers small, inconspicuous, pale yellow; petals shorter 

 than the refiexed sepals. Very common in moist places in meadows* and 



WOOds; April June. 



R. sceleratus L, Cms,,/ <\ Annual: stem 6- 20 inches high, glabrous, thick, 

 hollow, with acrid "juice; rool leaves of 3-5 rounded ldbes, others 3-parted, cut 



