FOUR NEW POTENTIiLACBAE. 137 



Spreading limb. Stamens 6, short, nearly equal ; filaments 

 stoutly subulate ; anthers small, ovate, acute. Ovary linear ; 

 stigma depressed and sessile. Siliques linear, straight, narrow, 

 only moderately compressed ; valves with strong midnerve ; 

 seeds in one row, not strongly flattened, oval-oblong, wingless. 



S. Whitedii. C. V. Piper under Aradis. This cruciferous 

 type of the Northwest, seen in flower only would be taken for 

 a member of the genus Lescuriella, several whitish-flowered or 

 pinkish species of which are very much like this in all except 

 their pods. But in Sandbergia the pods are really linear — 

 even narrowly linear — siliques ; but it does not at all follow 

 from this that the plant is an Arabis. There are plenty of 

 genera, Arabis, Sisymbrium, Erysimum,, Stenophragma and 

 many others into which pods like these are easily admissible ; 

 while the flowers of the present type are as far from those of 

 any Arabis as can be well imagined. I am constrained by its 

 floral characters, together with its completely vesicariaceous 

 habit and indument to propose for it the rank of a genus, 

 and I willingly dedicate it to him who first collected it. Dr. 

 J. A. Sandberg, whose name is already widely known as a 

 collector. 



Four New Potentillaceae. 



PoTENTiLLAVALLiCOLA. Stout and short branched caudex 

 surmounting a thick subligneous root : stems slightly decum- 

 bent, a foot high or more, almost naked above the base, ter- 

 minating in a rather contracted cyme, both stem and lower 

 face of all leaves silvery-tomentulose, but upper face darker, 

 yet canescent with a very thin coat of short silky hairs : basal 

 leaves about 4 inches long, not depressed, the petiole and leafy 

 rachis about equal as to length ; leaflets 7 to 9, closely approxi- 

 mate, 1 to 1/4^ inches long, oblong in outline, deeply and 

 incisely serrate, the upper pairs decurrent on the rachis : 

 corolla not seen ; mature calyx villous with long white hairs, 



