EANUNCULACEAE. 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. Bather 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. Kare, in wet soil. Sandstones and shales, limestones. 

 Sum. WATER-PLANTAIN SPEARWORT. 



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

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

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

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

 thickets. Spr. SMALL-FLOWERED CROWFOOT. 



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

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

 mostly crenate-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. E. sceleratus L. Stems stout, l;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. E. 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. E. 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. Eather rare, 

 in low grounds along the river. Spr. and sum. BRISTLY-BUTTERCUP. 



8. E. 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. E. 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. Kare, 

 in fields and on roadsides. Nat. of Eu. Spr. and sum. MEADOW-BUTTERCUP. 



10. E. 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. 



