17. R. aquatilis, L., var. trichophyllus, Gray. Common Water 
Crowfoot. 
Aquatic; common locally. May 15 — July 10. 
Hyde Park and south. North branch of the Chicago river. Rog- 
ers Park, Johnson/ Riverside, Bastin! 
18. R. eymbalaria, Ph. Seaside Crowfoot. 
Moist, sandy soil. May. 
Frequent from Hyde Park, south and west. Ravenswood. Evans- 
ton. 
Petioles 2 to 5 inches long. 
19. R. multifidllS, Ph. Yellow Water Crowfoot. 
Usually aquatic; common. May — June 15. 
Sometimes turns white with age. 
Creeping in sandy mud, Hammond, Ind., Hill . 
20. R. multifidus, Ph., var. terrestris, Gray. 
Prairies; rare. June — July. 
Rogers Park. South Chicago. Near Woodlawn. 
21. R. abortivus, L. Small-flowered Crowfoot. 
Rich soil, usually in open moist woods; common. April — July 
15th. v§Ci/i.' '• : ' ‘ . “ 
22. R. sceleratUS, L. Cursed Crowfoot. 
Swamps and ditches; frequent. May 20th — July. (B.) 
Evanston. Niles. South Chicago. Englewood and southeast. 
The juice of this species is so acrid that it will often cause blisters 
to form upon the skin of the collector. 
28. R, recurvatus, Poir. Hooked Crowfoot. 
Rich woods; frequent, rather local. May — June. (B.) 
In dry places it is usually less hairy. 
24. R. faseieularis, Muhl. Early Crowfoot. Buttercup. Cowslip. 
Sandy soil; abundant. April — May, often as late as August. 
A few specimens found at Glencoe bore white flowers. Plants 
occasionally 1 to 2 feet high. The roots vary from slender to 
quite fleshy. 
f 25. R. septentrionalis, Poir. Crowfoot. 
R. repens in Manual, 5th Ed., mainly. 
Moist woods and prairies ; common. May — June, often as late as 
September. * ■ . ' ' &f>~/ it - 
A very variable species. 
26. R. kepens, L. Creeping Crowfoot. 
A few specimens were collected in a low place near Maywood, July, 
1889, (B.) 
