Davis : RANUNCULI OF NORTH AMERICA. 4G7 



I. Stems filiform or nearly so, and usually rooting 

 at each node; peduncles usually less than 2 

 inches; radical leaves few 89. reptans. 



II. Stems larger, at least at the base, peduncles 



longer. 



J. Radical leaves not tufted ; stems seldom as- 

 cending 90. Unalaschensis. 



J J. Radical leaves tufted ; stem somewhat as- 

 cending 91. microlonchus. 



DD. Stamens only i to ten. 



E. Head of fruit oblong; stem leaves distinctly petioled. 



92. trachyspermus. 

 EE. Head of fruit small, globose; stem leaves sessile or 



nearly so 93 . pusillus. 



AA. Sepals and petals marcescent-persistent ; petals white or rose, 

 with ample nectary and imperfect scale; carpels wholly or partly 



utricular, but compressed and broad Sec. CRYMODES, Gray. 



B. Plant and sepals somewhat pubescent 94. glacialis. 



BB. Plant and sepals glabrous. 



C. Akenes about 3 lines long, wholly utricular ; plant about 6 



inches high, stoutish 95. Andersoni. 



CC. Akenes hardly half as large, not inflated ; plant taller and 

 more slender 96. juniperinus. 



1. R. arvensis LINN. Sp. PI. 555. 1753. 



Glabrous or sparsely pubescent, erect, i to 2 feet high, 

 branched above : lower leaves petioled, others sessile or nearly 

 so, nearly all divided; leaflets either stalked or sessile, cleft or 

 parted into linear-oblong segments : petals yellow, 2 to 3 lines 

 long ; sepals of same length, spreading : akenes few, flattened, 

 armed with long spines ; beak half their length or more, stout ; 

 head depressed-globose. Europe. Naturalized in New Jersey, 

 and near northern seaports. 



2. R. muricatus LINN. Sp. PI. 555. 1753. 



Sparsely pubescent or glabrous, often erect, succulent, 

 branched near the base, 6 to 20 inches high : lower leaves on 

 long broad petioles, reniform to round cordate, 3-5~cleft and 

 coarsely crenate-dentate : petals deep yellow, 3 lines long ; 

 sepals shorter, spreading : akenes compressed, large, con- 

 spicuously muricate-spiny ; beak stout, slightly curved : head 

 loose, globose. Asia and Europe. Naturalized near towns in 

 Virginia to Louisiana, also in California and southern Oregon. 



