64 LEAFLETS. 
tulose pubescence: leaves oval to ovate-oblong, 1 to 2 incheg 
long, firm, strongly veined, sharply serrulate, mostly acute, the 
upper face only obscurely puberulent and of a deep green: 
umbels of immature fruit on peduncles exceeding the half-inch- 
long petioles. 
On Bear Mountain near Silver City, New Mexico, 17 June, 
1903, O. B. Metcalfe; also by the same near Mangas Springs, 
in the same region. The species is not rare in the mountains 
of the western part of New Mexico and adjacent Arizona. 
RHAMNUS CASTOREA. Shrub with rather flexible branches 
and a subcoriaceous but deciduous foliage, both growing branch- 
lets and lower face of leaves minutely and densely whitish- 
tomentulose ; leaves mostly elliptical, 1 to 2 inches Inog, on stout 
petioles and traversed by a prominent and very broad midvein 
beneath, the margins obscurely and often remotely serrate, ber- 
ries large, usually 3-seeded, the seed nearly orbicular. 
Beaver Creek, northern Arizona, Aug. 1883, H. H. Rusby, n. 
550 of my set of Dr. Rusby’s plants. The specimens have for 
twenty years been allowed to pass for those of 2. /omentella, 
though the character by which itis distinguishable from that 
exclusively Californian species are obvious. 
RHAMNUS CUSPIDATA. Allied to the last two and to Ẹ. fo 
mentella but smaller, the tomentose pubescence different, coarser, 
looser and with longer and hirtellous hairs intermixed rather 
copiously, especially along the veins: leaves 2 to 2 inches long, 
oval to elliptical, abruptly and often cuspidately acute, sharply 
saliently and closely serrulate, those of vigorous shoots with 
even some coarse serratures below the cuspidate apex: flowers 
very copious, in dense cymes from all the axils, 5-merous, the 
triangular calyx-teeth longer than the tube: fruit not seen, said 
to be well flavored and edible. 
Foothills of the mountains in Kern Co., California; the type 
specimens from near Tehachapi, by the writer, 22 June, 1889. 
RHAMNUS OBTUSISSIMA. Deciduous shrub with short rigid 
densely leafy and finely puberulent branchlets, these dark red- 
purple the first season, afterwards grayish and glabrate: leaves 
small, ł to 14 inches long on very short and slender petioles, of a 
light green on both faces, thin, glabrous above, puberulent on 
