RANUNCULACEAE. 123 



1. R. reptans L. Stems slender, creeping, 0.5-1.5 dm. long: leaf -blades spatu- 

 late, oblong, or linear, 0.5-2.5 cm. long, entire or nearly so: petals 4-7, 3-4 

 mm. long: head of fruit globose or depressed, 3-3.5 mm. in diameter: achene- 

 body turgid, about 1.5 mm. long, the minute beak persistent. — Susquehanna 

 valley. Eather rare, in moist sand. — Spr. and sum. — Creeping-spearwort. 



2. E. obtusiusculus Eaf. Stems stout, glabrous, 3-12 dm. long: leaf -blades 

 linear to lanceolate, 8-15 cm. long, denticulate or entire: petals 5-7, 5-8 mm. 

 long: head of fruit globose or nearly so, 4.5-6 mm. thick, or longer: achene- 

 body orbicular-obovoid, about 2 mm. long, the subulate deciduous beak hori- 

 zontal. — N. M. Rare, in wet soil. — Sandstones and shales, limestones. — 

 Sum. — Water-plantain spearwort. 



3. R. abortivus L. Stems 1.5-6 dm. tall, glabrous or nearly so: blades of the 

 lower leaves reniform to suborbicular, 2-4 em. wide, mostly crenate: petals 

 pale-yellow, 2-3 mm. long: head of fruit oblong to cylindric: achene-body 

 fully 1.5 mm. long, very minutely beaked. — Common, in moist ground and 

 thickets. — Spr. — Small-flowered crowfoot. 



4. R. micranthus Nutt. Stems typically more slender than in B. abortivus, 

 pubescent: blades of the lower leaves cuneate to ovate, 1-3 cm. long, 

 mostly creuate-lobed or parted: petals light-yellow, 2-3 mm. long: head of 

 fruit oblong to ovoid-oblong: achene-body barely 1.5 mm. long, minutely short- 

 beaked. — Lower Susquehanna valley. Common, in woods and on rocky hill- 

 sides. — Schists. — Spr. 



5. R, sceleratus L. Stems stout, 1.5-6 dm. tall, glabrous or nearly so: leaf- 

 blades thick, the divisions cuneate, lobed: sepals ovate to suborbicular: petals 

 bright-yellow, 3-5 mm. long: head of fruit cylindric to oblong, the receptacle 

 glabrous or sparingly pubescent: achene-body fully 1 mm. long, minutely 

 beaked, thick-margined, the faces uneven. — Common, in wet places and 

 swamps. — Spr. — Celery-leaved buttercup. Ditch-crowfoot. 



6. R. recurvatus Poir. Stem slender, 1.5-7 dm. tall, hirsute: leaf -blades 

 thinnish, the divisions rhombic to ovate, toothed and sometimes also lobed; 

 sepals mainly lanceolate: petals pale-yellow, 3-5 mm. long: head of fruit 

 globular, the receptacle hispid: achene-body fully 2 mm. long, long-beaked, 

 thin-margined, the faces granular. — Common, in rich woods and swamps. — 

 Spr. — Hooked-buttercup. 



7. R. pennsylvanicus L. f. Stems erect, 3-7 dm. tall, hispid: leaf -blades 

 thinnish, the divisions relatively narrow, irregularly sharp-toothed: petals 

 pale-yellow, 2-4.5 mm. long: head of fruit cylindric to oblong: achene-body 

 about 2 mm. long, prominently beaked. — Susquehanna valley. Rather rare, 

 in low grounds along the river. — Spr. and sum. — Bristly-buttercup. 



8. R. repens L. Stems creeping, 1-8 dm. long, hirsute or glabrate: leaf- 

 blades thickish, the divisions broad, coarsely toothed or lobed: petals bright- 

 yellow, 10-13 mm. long: head of fruit globose: achene-body 3 mm. long, 

 minutely beaked, narrow-margined. — S. Not common, in fields. Nat. of Eu. 

 — Spr. — Creeping-buttercup. 



9. R, acris L. Stems 2-11 dm. tall, loosely pubescent: leaf -blades mostly 

 3-divided, the divisions broad, sharp-toothed, the middle division not stalked: 

 petals bright-yellow, about 1 cm. long: head of fruit globose: achene-body 

 about 3 mm. long, obscurely margined, minutely fine-beaked. — N. M. Rare, 

 in fields and on roadsides. Nat. of Eu. — Spr. and sum. — Meadow-buttercup. 



10. R. 'bulbosus L. Stems 1.5-5 dm. tall, rather appressed-pubescent : leaf- 

 blades thick, the divisions broad, blunt-toothed: petals bright-yellow, 7-11 mm. 

 long: head of fruit globose: achene-body about 3 mm. long, prominently 

 margined, minutely stout-beaked. — Common, on roadsides and in fields. Nat. 

 of Eu. — Spr. — Bulbous-buttercup. 



