524 



than trifoliolate or subpinnate. In flavjini they are usually dis- 

 tinctly pinnate with 3-7 leaflets, the odd leaflet elongated and ob- 

 liquely pinnatifid or pinnately-parted into oblong decurrent lobes; 

 the lowest pair of leaflets are frequently also pinnatifid. In the 

 trifoliolatestem-leavesof _/7rt'Z7/;/<? the end leaflet is much longer rel- 

 atively to the lateral ones than is the case in Cajtadcuse, and the 

 simple upper leaves are mostly oblong or narrower with often ob- 

 tuse basal lobes, usually in marked contrast with those of Cana- 

 dense, which are rhombic-ovate or obovate and cuneate with acu- 

 minate or very acute lobes or angles mostly at or above the middle. 



Thr dentition o the leaves in Jlavuni is coarser than in 

 Canadcnse, especially in the upper leaves, which are very coarsely 

 dentate with irregular shallow teeth, in striking contrast with the 

 much more finely and acutely dentate-serrate leaves of the latter. 



The stipules oiflavum are conspicuously larger than those of 

 Canadense and variously incised and lobed ; an extreme size is 

 i^' long by \y^' broad; the largest on specimens of Canadense 

 now before me are 8'' x 4". The pubescence of the leaves is in 

 flav7iin coarser and looser than in Canadense^ especially along the 

 veins on the lower side of the basal leaves ; it is much sparser on 

 the upper leaves which are sometimes glabrate; in Canadense the 

 leaves beneath are finely soft pubescent and velvety to the touch. 



'^\\\\& flavuni is generally more slender and weaker than Cana- 

 dense this is not always true, except perhaps of the inflorescence, 

 which is simpler and fewer-flowered with longer, more ascending 

 branches and peduncles, the bracts often more foliaceous and 

 sometimes entire. 



The flowers of the two plants are always conspicuously different 

 and constitute their most obvious distinctive character, \wflavnni 

 the very small petals are cream-color or palest yellow and much 

 shorter than the lobes of the calyx, l"-i^" long, Yz'-i" wide, 

 linear-oblong or often broadened to the abrupt or truncate often 

 retuse tip ; in Canadense they are pure white, oblong or obovate, 

 and two to four times as large (2"-4" long, i^''-3" wide) equal- 

 ling or exceeding the calyx-lobes. In both species the anthers 

 show a shade more color than the petals. The flowers differ 

 urther in the sepals, which in Canadense are more accuminate, and 

 in the bractlets of the calyx, which are rather larger xviflavuni. In 



