A STUDY OF RHUS GLABRA 1 95 



27. RHUS ELEGANTULA, sp. nov. 



Branches slender, glabrous, of a distinctly pinkish brown 

 underneath a coat of bloom: leaves small, 1.2- 1.8 dm. long, 

 the slender rachis quite white with bloom, its villous line very 

 marked; leaflets 11-15, loosely arranged, spreading or slightly 

 deflected, distinctly petiolulate, 4-6 cm. long, narrowly subfal- 

 cate-lanceolate, at least the long and slender acumination falcate, 

 sometimes the whole leaflet, the serratures, about 8 on a side, 

 more or less sharply prominent, the texture rather firm, color of 

 upper face pale bluish-green, the lower whitish with bloom : 

 fruiting panicle large in proportion to the foliage, commonly 

 more than 1 dm. high, pyramidal but narrowly so, its branches 

 thinly villous with ascending or spreading hairs : drupelets 

 small, arranged upon simple racemose branches of the panicle, 

 compressed, acutish. 



Mountains of extreme southern Arizona along the Mexican 

 boundary, the typical specimens from about Fort Apache, by 

 Edward Palmer, June, 1890 ; these on sheet 19808 of the 

 National Herbarium ; others distributed by Dr. Palmer under 

 his No. 585. Probably the same as a specimen from the Santa 

 Catalina Mountains, September, 1896 by J. W. Tourney, U. S. 

 Herbarium sheet 441724. Lastly rather larger specimens, but 

 otherwise true to the character, have come in this season from 

 the Huachuca Mountains, sent by Mr. J. C. Blumer, who col- 

 lected them late in August, 1906. 



28. RHUS SORBIFOLIA, sp nov. 



Shrub apparently low and not stout, the young branches and 

 lower face of foliage not whitened, hardly paler than glauces- 

 cent : leaves small, only 1-2 dm. long, spreading away from 

 the stem divaricately, or even a trifle deflected, the petiole and 

 rachis rather slender; leaflets few, only 9 or 11 and loosely 

 arranged, dull deep green above, glaucescent beneath, of small 

 size, 2.5-6 cm. long, oval to oblong-lanceolate, sessile by an 

 abruptly acutish base, at apex subulate pointed rather than 

 acuminate, rather remotely and sharply serrate, the serratures 

 only 7-9 on each margin : panicle of staminate flowers pyram- 



