RANUNCULACEAE 441 
3. Batrachium flaccidum (Pers.) Rupr. Resembling the next preceding species. 
Leaves with larger and more slender petioles ; blades with very long flaccid segments, col- 
lapsing when withdrawn from the water. 
In streams, Massachusetts to Washington, North Carolina and Lower California. Also in Europe, 
Asia and Africa. Spring to fall. 
22. HALERPESTES Greene. 
Perennial sometimes scapose herbs, with runners. Leaves mainly basal: blades cre- 
nate, dentate or lobed, long-petioled. Flowers small, yellowish, solitary or 2-7 together 
on scapes or scape-like peduncles. Sepals usually 5, spreading, tardily deciduous. Petals 
5-12, each bearing a small nectar-pit near the base. Stamens and pistils numerous. Head 
of fruit oblong, oval or subglobose. Achenes compressed, sometimes swollen, longitudi- 
nally striate, without a hard coat. 
1. Halerpestes Cymbalaria (Pursh) Greene. Foliage glabrous. Plants somewhat 
fleshy, spreading by runners. Leaves mostly basal; blades slender-petioled, ovate, cor- 
date-oval or reniform, crenate, 4-18 mm. long: flowers 1-7, about 6-8 mm. broad, borne 
on scapes 2.5-15 em. long, these sometimes bearing one or more leaves toward the base : 
head of fruit oblong, 6-16 mm. long: achenes compressed, somewhat swollen, distinctly 
striate, minutely sharp-tipped. 
On sandy shores, Labrador to New Jersey. west along the St. Lawrence River and the Great Lakes 
to Minnesota and the Northwest Territory, and in saline soil throughout the western half of the conti- 
nent, extending into Mexico. Also in Asia and South America. Summer. 
23. RANUNCULUS L. 
Annual or perennial herbs, with erect or creeping stems. Leaves alternate: blades 
simple, entire, lobed or divided, or dissected. Flowers solitary or variously disposed. 
Sepals mostly 5, deciduous. Petals as many as the sepals or more, or rarely fewer, yellow, 
white or red, conspicuous or minute, each provided with a nectariferous pit and a scale 
at the base of the blade. Carpels several or numerous, l-ovuled. Achenes capitate or 
Spicate, generally flattened, smooth, papillose or echinate, each tipped with a minute or an 
elongated style. CRow-roor. BUTTERCUP. 
Aquatic plants: submerged leaves with dissected blades; floating leaves with lobed blades. 
: 1. R. delphinifolius. 
Terrestrial or mud plants: leaves with entire, toothed, lobed or divided blades. 
Mud plants : leaves with entire or denticulate blades. 
Annuals: achenes beakless. 
Petals mostly 1-3, poe yellow, barely 2 mm. long: stamens 5-10. 
Head of fruit oblong or cylindrie: achenes suborbicular, less than 1 mm. long. 
R. pusillus. 
R. oblongifolius. 
R. obtusiusculus. 
Head of fruit subglobose: achenes obovoid, fully 1 mm. long. 
Petals 5, bright yellow, over 2 mm. long : stamens numerous. 
Perennial: stems creeping : achenes with subulate beaks. 
Terrestrial plants : leaves with all or some of the blades lobed or divided. 
Basal leaves with all or some of the blades crenate. 
Petals conspicuous, much longer than the sepals. 
Petals tit tats shorter than the sepals or about equalling them 
in length. : 
Styles very short. F 
Basal leaves with cordate blades: foliage glabrous or nearly so. 7. R. abortivus. 
Basal leaves with truncate or cuneately narrowed blades: foliage 
pubescent. 8. 
Styles subulate, hooked, nearly ¥ as long as the achene-body. 9. 
Basal leaves with all blades lobed or divided. 
A. Achenes smooth and glabrous. 
Foliage glabrous: stem hollow: flowers relatively small. : 10. R. sceleratus. 
ery more or less pubescent: stems not hollow: flowers relatively 
arge. 
Beaks of the achenes hooked. 11. R. recurvatus. 
Beaks of the achenes straight or slightly curved. : 
Achenes with beaks less than 14 as long as the bodies. 
Petals about as long as the sepals: head of fruit oblong or ; 
cylindric. 12 E. Pennsylvanicus. 
Petals much longer than the sepals : head of fruitsubglobose. 13. R. bulbosus. 
Achenes with beaks over 12 as long as the bodies; beaks some- 
times partially deciduous. 
Carpels or achenes few. 14. R. palmatus. 
Carpels or achenes numerous. : 
a. Corolla 2.5 em. broad orsmaller: petals5: head of fruit 
subglobose. " : 
* Plants stoloniferous: foliage glabrous or nearly so. 15. R. septentrionalis. 
gue cote 
D 
S 
Harveyi. 
micranthus. 
. Allegheniensis. 
SS 
