Davis : RANUNCULI OF NORTH AMERICA. 467 
I. Stems filiform or nearly so, and usually rooting 
at each node; peduncles usually less than 2 
inches; radical leaves few...:.....<+.+: Sg. reptans. 
II. Stems larger, at least at the base, peduncles 
longer. 
J. Radical leaves not tufted; stems seldom as- 
SEMIN OR eds. ntste cers ces dee 90. Unalaschensis. 
JJ. Radical leaves tufted; stem somewhat as- 
CEN GIAS IH UNa cece es oedas 1 Qi. microlonchus. 
DD. Stamens only 1 to ten. 
E. Head of fruit oblong; stem leaves distinctly petioled. 
92. trachyspermus. 
EE. Head of fruit small, globose; stem leaves sessile or 
GS AIGL Ys BUlee sn a Maven ed emi ane cease seme Neat en eters sic 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. CryMopEs, Gray. 
B. Plant and sepals somewhat pubescent................. 94. glactalts. 
BB. Plant and sepals glabrous. 
C. Akenes about 3 lines long, wholly utricular; plant about 6 
Bisbee ISL. SCOULISHS.. yc sctas.ded xa kpicisinnslaeaecee vs 95. Andersont. 
CC. Akenes hardly half as large, not inflated; plant taller and 
PMIRCUICUOC Ens vert ce nadistlsSeneearseesceidnotaosnecs 96. juntperinus. 
1. R. arvensis Linn. ped S550) Eros 
Glabrous or sparsely pubescent, erect, 1 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. Naturalizedin New Jersey, 
and near northern seaports. 
2. R. muricatus Linn. Sp. Pl. 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. 
