Ranunculaceae | 71 
YY. Plants very hairy. E. CR. macounit.) 
R. oreganus macounli Pip. (Macoun Buttercup) 
XX. Leaves mostly white-spotted; stem prostrate; plant with stol- 
ons. 
R. repens L. (Creeping Buttercup) 
WW. Petals 7—16; beak of akene 3—4 mm. long. 
Z. Leaf-segments linear to cuneate-obovate, 2——3-lobed or -toothed. 
W. E. (R. maximus.) 
R. orthorhynchus Hook. 
ZZ. Leaf-segments oblong to ovate, 3-cleft or -parted and again 
3—9-toothed. E. (JR. septentrionalis for our region.) 
R. platyphyllus Pip. 
UU. Beak of akene hooked. 
Panel ctals. >. 
b. Petals 4—6 mm. long, less than I'/% times as long as the sepals. 
c. Plants rather densely stiff-hairy; leaves not brown-blotched; 
akenes smooth on the faces. W.C. E. (RR. douglasii; R. arc- 
uatus.)  R&. bongardii Gr. 
ec. Plants glabrous to somewhat stiff-hairy ; leaves mostly brown- 
blotched; akenes hispid on the faces. W.C. E. (R. greenet.) 
R. bongardii greenel Pip. (Blotched Buttercup) 
bb. Petals 6—15 mm. long, at least twice as long as the sepals. 
d. Basal leaves coarsely crenate to 3—7-cleft, segments entire; 
stem-leaves palmately many-cleft, segments incisely crenate. E. 
R, cardiophyllus Hook. 
dd. Basal leaves 3-parted, segments sometimes again 2—95-lobed; 
stem-leaves 3-parted, segments entire or 2—3-lobed. E. 
R. ciliosus How. 
ddd. Basal leaves 3——5-cleft or -parted, segments 2——3-lobed; 
stem-leaves 3——5-parted or -divided; segments entire. W. (RR. 
eisent; IR. howellii; R. occidentalis rattanii; R. montanensis.) 
R. occidentalis Nutt. (Prairie Buttercup) 
aa. @ Petals, 6-—15. ) W.: 
R. californicus Benth. 
II. Faces of akenes scabrous or muriculate or echinate; annuals. 
e. . Akenes hispid with hooked hairs; beak of akene hooked; plant pubescent. E. 
‘ R. hebecarpus H. & A. (Bur-seed Buttercup) 
ee. Akenes muriculate. 
f.. Plant villous or hirsute; leaves 3—5-parted or -divided; petals not longer 
than the sepals; beak of akene hooked. W. 
R. parviflorus L. (Small-flowered Buttercup) 
ff. Plant nearly glabrous; leaves 3—5-cleft; petals longer than the sepals; 
beak of akene not hooked. W. 
R. muricatus L- (Rough-seeded Buttercup) 
; THALICTRUM MBADOW-RUE 
Herbs, perennial, erect, tall, usually. smooth. Leaves alternate, ternately 2—3- 
compound. Flowers perfect or polygamous or dioicous, usually small, greenish-white, 
in panicles or racemes. Sepals 4—5. Petals none. Stamens many, exserted. Akenes 

