243 



LEAFLETS. 



A dwarf petrophilons species from head of Pettit Lake, Idaho, 

 L. P. Henderson, 1895, n. 3598, as in U. S. Herb. 



B. Sakdbeegii. Tall and stout, reddish-hispid as to stem 

 twigs, pedicels, petioles, and even the veins beneath, but prickles 

 more uniform than in the last, none as stout, none obviously 

 flattened except those of the leaves beneath : leaves of the twigs 

 commonly 5-foliolate, deep green on both faces when grown 

 sparsely strigose hairy above, not so beneath ; odd leaflet broadly 

 oval to rhomboid-ovate, all merely acute, doubly or simply 

 incise-serrate : calyx strongly aculeate and puberulent. 



Packsaddle Peak, Idaho, Aug., 1892, Sandberg, McDougal 

 and Heller, n. 859, as in U. S. Herb. 



B. FILIPENDULA. Dwarf, but stout as to the stem, the short 

 twigs and long pedicels slender, only the main stem very hispid : 

 leaves small, pale beneath, the indument only very obscure except 

 in those young and growing : odd leaflet deltoid-ovate to rhom- 

 boid, hardly an inch long, acute : fruiting pedicels slender, 

 pendulous, aculeolate ; calyx seldom bristly, commonly only 

 puberulent. 



Lost River Mountains, Idaho, Aug., 1895, L. F. Henderson, 

 n. 4039, as in U. S. Herb. 



B. viBUBNiFOLiA. Stem stoutish, tortuous, perhaps tall, 

 sparingly hispid ; twigs tortuous, thinly and softly hispidulous : 

 leaves of a clear bright green on both faces, glabrous above, also 

 beneath save as to scattered bristles or slender prickles along 

 some veins; odd leaflet deltoid-ovate. If inches long, acute, 

 sharply serrate, the veins elevated and conspicuous beneath : 

 calyx with a few prickles at its base, the segments only puberu- 

 lent : fruit uncommonly large, apparently amber-color or yel- 

 lowish. 



Selkirk Mountains, B. 0., Aug., 1904, 0. H. Shaw, n. 472, as 

 in U. S. Herb. 



B. SUBAKCTICA. Stcms tall, stout, hispid with rather sparse 

 short slender prickles ; twigs very leafy, scantily and shortly 

 glandular-hispid, the bristles very diverse as to length and 

 thickness : foliage firm, dark-green above, much plicate, pale 



