ROSACEOUS GENERA. 241 
light-green, not even the indument reddened : odd leaflet broadly 
ovate, 2 inches long, 14 inches wide, merely acute, doubly serrate- 
toothed, all pale beneath with very light and thin tomentum, all 
veins aculeolate: calyx densely aculeolate but not glandular. 
Middle or northern Colorado, apparently, and in the lower 
foothills only, Cowen, 17 June, 1895, n. 149, as in U. S. Herb. 
B. UNICOLOR. Young stem and twigs glaucous, less hispid, 
mature foliage green alike on both faces: leaflets narrower; the 
odd one ovate to rhomboid and oblong-lanceolate, doubly serrate, 
the laterals small in proportion, all aculeolate on the lower part 
of the veins beneath: calyx with broad ovate-acuminate seg- 
ments and both lightly glandular-hairy and aculeolate. 
Near Red Lodge, Montana, 27 July, 1893, J. N. Rose, n. 52, 
asin U.S. Herb. 
B. PERAMOENA. Mature stems nearly smooth, the bristles 
short and very sparse; twigs and pedicels showing rather more 
numerous and longer gland-tipped hairs; leaves ample, thin, 
green and glabrous on both faces when mature, rather copiously 
aculeolate on the veins beneath ; odd leaflet ovate to oval, 2 inches 
long or more, acuminate, lightly incised, the lobes serrate: calyx 
both finely aculeolate and glandular-hairy almost to the tips of 
the long triangular-subulate segments. 
In meadows along the banks of St. Mary’s River, Idaho, June, 
1805, J. B. Leiberg, n. 1105, as in U.S. Herb. Of most elegant 
thin green long-pointed foliage. 
B. caTAPHRACTA. Densely armed, both as to the main stem 
and twigs, with rigid prickles, some longer and straight, others 
shorter, widened at base and slightly deflexed, this armature sup- 
plemented by as many short, rather rigid gland-tipped bristles; 
leaves small, deep-green on both faces in age, the younger white 
tomentose beneath, the veins of all beneath closely beset with 
strong flat prickles, with others short and subterete intervening; 
odd leaflet ovate, acute, simply or doubly serrate, 14 inches long ; 
calyx and pedicels glandular-pubescent beneath a strong arma- 
ture of prickles. 
