SBGBEGATBS OP KHUS. 135 



S. SABULOSA. Upright, slender, the mature branches glabrate, 

 while growing obscurely puberulent : foliage small, subcoriace- 

 ous, glabrous; terminal leaflet I inch long, obovate-cuneiform, 

 tapering and entire from far above the middle, at summit broadly 

 and obtusely 3-lobed, the middle lobe slightly exceeding the 

 others ; lateral leaflets smaller, less cuneate, the 3 lobes more 

 shallow: fruits not small, puncticulate and somewhat bristly. 



Pebbly banks or beds of the Eio San Pedro, western Texas, 

 Charles Wright, 1851, n. 917 as in U. S. Herb. 



S. HBDERACEA. Evidently dwarf, with many short rigid 

 divergent branches, these at first obscurely puberulent, later 

 glabrous : leaves small, of a deep almost ivy-green above and 

 with light-colored veins, glabrous on both faces, or with 

 some short hairs along the veins beneath ; terminal leaflet i to 

 1 inch long, below the middle quite as broad, broadly rhomboid, 

 with about 3 shallow crenate lobes on each margin, all very 

 obtuse but mucronulate ; laterals not half as large, obovate : 

 spikes small, subsessile, bracts transverse-rugulose, sparsely 

 pubescent : immature fruits hirtellous and viscid-granular. 



Mica Spring, Nevada, M. E. Jones, in U. S. Herb. 



S. APFiifis. Habit of the last, with similarly deep green 

 whitish-veiny foliage, but all the leaves simple, often cleft 

 deeply into 3 lobes, each lobe simply or doubtly crenate, as often 

 not lobed at all, then broadly ovate above a broad truncate base, 

 the largest 1 inch long : fruits large, viscid-granular, otherwise 

 nearly glabrous. 



Shrub of southern Utah deserts, collected at Kanab, Spring- 

 dale and Silver Eeef in 1894 by M. E. Jones, and distributed as 

 " Jihus Canadensis simplicifolia, Greene," but erroneously, the 

 shrub, despite its simple foliage, being more nearly akin to 

 S. hederacea. 



S. SIMPLICIFOLIA. Rhus Canadensis simplicifolia, Greene, 

 Bull. Torr. Club, xvi 13. The leaves in this are not of the dark 

 ivy-green of the last ; they are of round-ovate outline, a little 

 tapering to the petiole, broadest not at base but toward the 

 middle, and simply as well as evenly crenate all around except 

 across the base, 



