tea 
’ 
Vor. II.] CROWFOOT FAMILY. 73 
Petals small, shorter than or equalling the sepals. 
Styles very short. 
Basal leaves cordate; plant glabrous ornearly so. 15. R. abor/ivus. 
Basal leaves not cordate; plant villous. 16. R. micranthus. 
Styles subulate, hooked, nearly one-half as long as the achene. 
% 17. R. Alleghaniensts. 
Leaves all lobed or divided. 
Plant glabrous; stem hollow; flowers very small. 18. R. sceleratus. 
Plants more or less pubescent. 
Beak of the achene strongly hooked; flowers 4'’-5'' wide. 19. R. recurvatus. 
Beak of the achene short. 
Erect plants, naturalized in fields; flowers 1’ broad. 
Calyx spreading; roots fibrous. 20. R. acris. 
Calyx reflexed; stem bulbous-thickened at base. 21. A. budbosus. 
Erect or ascending plants of moist soil; flowers 3''-6'' broad. 
Petals not longer than the reflexed sepals. 22. R. Pennsylvanicus 
Petals longer than the sepals. 23. R. Macounit?. 
Ascending and creeping by stolons; flowers 1' broad. 24. R. repens. 
Beak of the achene long, stout or slender; flowers 6'’-18"’ broad. 
Roots slender; beak stout; leaflets cuneate at base. 25. A. septentrionalis. 
Roots thickened; beak of achene slender, subulate. 
Leaf-segments broad, oblong or obovate. 26. R. hispidus. 
Leaf-segments narrow, linear-oblong. 27. R. fascicularis. 
2. Achenes with a few scattered papillae near the margins. 28. R. parvulus. 
3. Achenes rough-papillose all over. 29. R. parviflorus. 
4. Achenes muricate or spiny. 
Leaf-lobes broad, obtuse. 30. R. muricatus. 
Leaf-lobes narrow, subacute. 31. R. arvensis. 
1. Ranunculus delphinifolius Torr. 
Yellow Water-Crowfoot. (Fig. 1595.) 
Ranunculus multifidus Pursh, Fl. Am. Sept. 736. 
1814. Not Forsk. 1775. 
R. delphinifolius Torr.; Eaton, Man. Ed. 2, 395. 1818. 
Ranunculus lacustris Beck & Tracy, N. Y. Med. and 
Phys. Journ. 2: 112. 1823. 
Aquatic or partly emersed, branching, some- 
times several feet long. Immersed leaves re- 
peatedly divided into capillary segments, short- 
petioled, 1-3’ long; emersed leaves glabrous or 
pubescent, 14/-2’ broad, petioled or the upper 
nearly sessile, 3-5- divided, the divisions cleft into 
linear or cuneate segments; flowers yellow, 9/’— 
18’’ broad; petals 5-8, much longer than the 
sepals; head of fruit globose or oblong, 3/’—-5/’ 
long; achenes less than 1/’ long, callous-mar- 
gined, tipped with a straight persistent beak of 
one-half their length or more. 
In ponds, Ontario to Michigan, south to North 
Carolina and Missouri. The so-called var. ferresrist 
appears to be an emersed form. June-Aug. 
2. Ranunculus Ptrshii Richards. Pursh’s Buttercup. (Fig. 1596.) 
Ranunculus Purshii Richards. Frank. Journ. 741. 1823. 
Se og limosus Nutt.; T. & G. Fl. N. A. 1: 20. 
Srereaeip elias mullifidus var. repens S. Wats. Bot. 
King’s Exp. 8. 1871. 
Perennial, creeping, pubescent at least on the 
younger parts, sometimes densely so; stems slender, 
often rooting from the lower nodes, 2/-S’ long. 
Leaves slender-petioled, orbicular or reniform in 
outline, 4/-1’ wide, palmately divided nearly to 
the base into obtuse lobes or segments; flowers yel- 
low, long-peduncled, 2/’-7’’ broad; sepals spread- 
ing, ovate, obtusish, early deciduous; petals about 
5; head of fruit subglobose or ovoid-oblong, obtuse, 
2//-3/’ long; achenes little compressed, smooth, 1%’ 
long, acutish on the back, abruptly tipped with a 
slender style of about one-third their length. 
In moist soil, northern Michigan and Minnesota to 
western Ontario and arctic America, west to British 
Columbia, south in the Rocky Mountains to Colorado 
and Utah. July-Aug. 
Ws 
A 
