260 RANUNCULACEAE 
ing half way to base. Rich woods, rocky places. Throughout our region. 
April-May. 
9. R. arvensis, L. (Fig. 6, pl. 50.) Corn Crowroot. Plant without 
hairs or with few hairs; about 1 ft. high. Lower leaves on rather long 
foot-stalks elliptic or more rounded. Upper leaves cut into wedge- 
shaped or linear segments, these segments entire or notched at the edges. 
Leaves at middle of stem on foot-stalks, those above without foot-stalks. 
Flowers about 4 in. broad; segments of calyx not reflexed. Fruit covered 
with prickles. Waste places, New Jersey and southward. Summer. 
Lower leaves 3-parted nearly or quite to the base, divisions not on 
elongated foot-stalks 
10. R. recurvatus, Poir. (Fig. 4, pl. 50.) Hookep Crowroor. Stem 
4 to 2 ft. high, hairy. Leaves broadly kidney-shaped with two deep 
sinuses extending about half way to base. Lobes indented. Flowers not 
large. Achenes with a strong hooked beak (Fig. 3, page 396). Common, 
Mostly in woods. 
ll. R. acris, L. (Fig. 1, pl. 48.) Tart, om Mrapow BUTTERCUP. 
Stem 2 to 3 ft. high, somewhat hairy. Leaves deeply cut into 3 lobes 
and these lobes again divided. Upper leaves, segments very narrow. 
Flowers rather large. Sepals spreading. This is the very common but- 
tercup of meadows. Blooms all summer. 
12. R. parvulus, L. (Fig. 5, pl. 50.) Harry Burrercup. Stem 
6 to 15 in. high. Whole plant hairy. Leaves 3-divided, the divisions 
more or less deeply cleft or lobed, the upper leaves linear or divided. 
Flowers about 1 in. broad; calyx reflexed. Head of fruit oblong. Waste 
places, New Jersey and southward. All summer. 
One leaflet on each of the 3 divisions of the leaf with an elongated foot- 
stalk (Fig. 7, page 246). Only the terminal leaflet on a foot-stalk 
13. R. bulbosus, L. (Fig. 1, pl. 49.) BuxLsous Butrercup. Stem 
erect, with few branches, hairy, 4 to 14 ft. high. Leaves in 3 parts, the 
terminal part on a foot-stalk, the other divisions directly on the leaf 
stem. Each segment deeply indented. Flowers large, calyx reflected. 
Root bulbous. In grassy fields, mostly in eastern section of our area. 
May-June. 
14. R. fascicularis, Muhl. (Fig. 2, pl. 49.) Earty BUTTERCUP. 
TurtED Butrercur. Low, spreading. Stem and leaves hairy. Leaves 
similar to No. 13, but leaflets less deeply indented. Calyx segments 
spreading. Flowers rather large. In shady places and fields. New 
York, New England and southward. May-June. 
Each of the three leaflets on a foot-stalk 
15. R. septentrionalis, Poir. (Fig. 2, pl. 48.) Marsn BUTTERCUP. 
A branching plant, smooth or slightly hairy, 1 to 3 ft. high. Leaflets 
of 3 distinct leaflets, each on a long foot-stalk and each deeply cut into 
3 segments. Moist, shady places. 
16. R. hispidus, Michx. (Fig. 1, pl. 50.) Hispip Burrercur. 
Densely hairy, 4 to 2 ft. high, spreading. Leaflets, the terminal on a 
