362 Rhus glabra ab Edward L. Greene revisa et in species novas atque usw. 
locality by D. T. MacDougal, no. 309, July 18, 1898. This, too, from 
an altitude of about 7000 feet. The late date of its flowering, as an ally 
of Rhus glabra in the generally torrid climate of Arizona, indicates the 
subalpine character of its habitat. 
24. Rhus elegantula E. L. Greene, l. c., p. 195. 
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 subfalcate-lanceolate, at least the long and slend acumin- 
ation faleate, 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 
paniele large in proportion to the foliage, commonly more than 1 dm 
high, pyramidal but narrowly so, its branches thinly villous with ascend- 
ing or spreading hairs; drupelets small, arranged upon simple racemose 
branches of the panicle, compressed, acutish. 
Mountains of extreme southern Arizona along the Mexican bound- 
ary, the typical specimens from about Fort Apache, by Edward Palmer, 
June, 1890, no. 585. Probably the same as a specimen from the Santa 
Catalina Mountains, September, 1896 by J. W. Toumey. 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. 
August, 1906. 
25. Rhus sorbifolia E. L. Greene, 1. c., p. 195. 
Shrub apparently low and not stout, the young branches and lower 
face of foliage not withened, hardly paler than glaucescent; 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 acumin- 
ate, rather remotely and sharply serrate, the serratures only 7—9 on each 
margin; panicle of staminate flowers pyramidal, 12 cm long; sepals 
triangular, acute; petals twice as long, oblong, obtuse, the anthers equal- 
ing them. 
Type from mountains west of Las Vegas, New Mexico. G. R. Vasey, 
1881: U. S. Herbarium. Species with most characteristic habit and foliage. 
26. Rhus asplenifolia E. L. Greene, |. e., p. 196. 
Shrub evidently dwarf or at least low, the leafy branches short. 
slender, tortuous, glabrous, glaucous; leaves small, about 1,5 dm long. 
the rachis slender, deeply and narrowly furrowed and the hairy line ob- 
vious; leaflets only 7—9, pale green above, moderately glaucous beneath, 
oblong-lanceolate to lanceolate, 3,5—5,5 cm long; subsessile, acuminate, 
very irregularly and somewhat incisely serrate, even coarsely so, the 
