A STUDY OF RHUS GLABRA 1 89 



fruiting panicle rather lax, slender-peduncled and as if some- 

 what drooping but of pyramidal outline, its branches rather 

 finely pubescent ; drupelets of middle size, notably oblique, 

 acutish. 



Inhabits the region of scattered woodlands and small prairies 

 in southern Michigan and northern Indiana and Illinois, if I 

 rightly refer to it rather numerous specimens, collected in various 

 places, all in young leaf and flower only. Such are in the her- 

 bariafrom Warrenville, 111., by L. M. Umbach, July 2, 1895, and 

 by Charles C. Deam at Bluffton, Indiana, 1897 ; but the type 

 sheet, No. 1 24146 of the Field Museum, a perfect fruiting speci- 

 men, is from Jackson County, Michigan, by S. H. and D. R. 

 Camp, September 19, 1898. Sheet 6072 of the same herbarium, 

 from Stark County, Illinois, may or may not be the same. Its 

 detached fruiting panicle may well belong here, but the one 

 leaf shown is attached to a flowering branch, and therefore im- 

 mature. 



18. RHUS CISMONTANA, sp. nov. 



Shrub doubtless low, all its parts reduced in size and rather 

 slender as to branches and leaf-rachis, all these pale and 

 glaucous: leaves 1.5-2 dm. long, ascending; leaflets 11-13, 

 not crowded, of a pallid green above but only glaucescent 

 beneath, mostly oblong and abruptly acuminate, 4-6 cm. long, 

 only subsessile, or some of the more basal leaflets definitely 

 petiolulate, sharply and rather closely serrate, the serratures 

 10-12 on each side, even the most mature state of foliage not 

 subcoriaceous, though firm : fruiting panicle about 9 cm. high, 

 pyramidal but narrowly so and compact ; outline of drupelets 

 slightly inclining to ovate, being a trifle longer than broad, not 

 depressed but rather acutish at summit. 



Open hills of the more westerly parts of Nebraska and Kansas, 

 as well as probably in adjacent Colorado, if not Wyoming. The 

 type specimens are in U. S. Herbarium No. 210241, collected 

 by Mr. Rydberg in Thomas County, Nebraska, 1883 ; and Mr. 

 J. B. Norton's so-called R. glabra from Riley County, Kansas, 

 collected in 1895, appears to be quite the same; probably even 

 Mr. Clements' specimens from northeastern Nebraska, 1893, 



