258 RANUNCULACEAE 
Aquatic Plants 
l. R. delphinifolius, Torr. YELLow Water Crowroot. Stem partly 
or entirely immersed. J.eaves divided into many segments, the sub- 
mersed ones mostly of thread-like segments, the floating ones somewhat 
broader and flattened, even rounded or kidney-shaped. Flowers yellow. 
In ponds throughout our area. May-July. 
Terrestrial Plants growing in marshes, ditches and wet places 
2. R. pusillus, Poir. Low Sprrarwort. A low slender plant, 6 to 
12 in. high. Lower leaves egg-shaped, mostly with very shallow den- 
tations, on long foot-stalks.. Upper leaves narrow lance-shape on short 
or no foot-stalks. Flowers small, yellow, usually with few petals or 
with 5. In marshes, southern New York, New Jersey and south. April- 
July. 
3. R. laxicaulis, (T. and G.) Darby. (Fig. 2, pl. 50.) WaATEE 
PLANTAIN SPEARWORT. (R. obtusiusculus, Raf.). Plant ascending or 
nearly erect, smooth, 1 to 3 ft. high. Leaves grass-like, 3 to 6 in. long, 
about 4 to } in. wide, not toothed or with very shallow indentations; 
on broad foot-stalks which clasp the stem. Stems throwing out roots at 
joints. Flowers yellow, rather conspicuous. Marshes and ditches, our 
area. June-Aug. 
Terrestrial Plants not peculiar to wet places. Heads of fruit cylindric 
4. R. sceleratus, L. (Fig. 5, pl. 48.) CELERY-LEAVED CROWFOOT. 
Stem 3 to 2 ft. high, smooth, sometimes quite thick. Lower leaves on 
long foot-stalks more or less triangular, the two deep sinuses extending 
4 way or more toward the base. Upper leaves without foot-stalks in 3 
long narrow divisions, Flowers numerous, yellow, petals small, caly» 
spreading. Fruit cluster elongated, oblong or cylindric. Swamps and 
wet places. Common. April-Aug. 
5. R. pennsylvanicus, L. f. (Fig. 4, pl. 49.) Bristity BUuTTERCUP. 
Stem similar to No. 4, but bristling with hairs. Leaves 3-divided and on 
short foot-stalks. All the segments narrow. Flowers yellow, petals rather 
small, not exceeding the length of the reflexed sepals. June-Aug. 
Heads of fruit globular. Lower leaves broadly rounded, heart-shaped 
6. R. abortivus, L. (Fig. 4. pl. 48.) KipNry-LEaAveD CrRowFoorT. 
A smooth plant in borders of woods and in moist places, 4 to 2 ft. high. 
Lower leaves rounded, undivided except by wavy undulations, heart- 
shaped at base, on long foot-stalks. Upper leaves without or with very 
short foot-stalks, divided into 3 narrow segments, each either notched 
or acute at apex. Flowers yellow, petals shorter than the divisions of 
the calyx. Woods and moist grounds. April-June. 
7. R. alleghaniensis, Britton. Closely resembles R. abortivus, but 
stem has a whitish bloom and achenes have a recurved beak which is 
not found in R. abortivus. Situations same as R. abortivus. 
8. R. micranthus, Nutt. Rock Crowroot. Plant similar to the 
preceding, but covered with hairs and lower leaves with sinuses extend- 
