KOSACEOUS GBKERA. 343 



beneath, with a fine downy rather than tomentose indument; 

 odd leaflet 2 inches long, ovate, abruptly acuminate, almost 

 simply serrate-toothed : peduncles and pedicels densely gland- 

 ular-hispidulous : calyx aculeolate at base, the segments cinere- 

 ous-puberulent : fruit small, very downy. 



Porcupine Eiver, northeastern interior of Alaska, 1891, J. H. 

 Turner ; type in my herbarium. 



B. Aeizonioa. Low but upright, the stem sparsely but stiffly 

 aculeate; twigs, petioles, and even rachis of the leaf more 

 densely hispid with shorter prickles ; leaflets usually 5 even on 

 fruiting twigs, the odd one cuneate at base and of more or less 

 rhomboid figure, all acute, doubly incise-serrate, glabrous above, 

 white-tomentose beneath even in fullest maturity : pedicels and 

 calyx densely glandular-hirtellous and with frequent large and 

 stout prickles: calyx large for the plant, its base aculeolate, its 

 deltoid-ovate segments almost caudate-acuminate, often narrow, 

 foliaceous at the very tip. 



Mountains of Arizona and New Mexico to those of at least 

 southern Colorado ; the type from the San Francisco Mountains- 

 as collected by myself in 1889. 



Melanobatus. Stems greatly elongated and arcuate, glau. 

 cous, prickly, the prickles fiattened and recurved. Leaves 

 pinnately (rarely pedately) 3-5 foliolate. Flowers not showy, the 

 calyx parted almost to the base. Petals small, dull-white. 

 Fruit hemispherical, parting from the receptacle; drupelets 

 small, the pulp scanty, firm rather than watery. Eeticulation 

 of pyrene running into a keel on the back. 



Genus wholly American, recalling the Old World subgenus or 

 genus Glaucobatus (Dumortier); but they are only bluish proper 

 Blackberries, not Easpberries. The species of Melanobatus 

 are few. 



M. oocidbntalis. Linn., under Rubus. 



M. NEGLECTUS. Peck, " " 



M. LEUCODEKMIS. Dougl, " " 



