VARIOUS BLACKBERRIES 381 



growing wild have the long clusters of R. nigrobaccus rather than 

 the short ones of the var. sativus. 



The race of hybrids between the blackberry and dewberry 

 (R. nigrobaccus X -B- villosus) has already been mentioned (Figs. 

 66-69) . These hybrids are frequent in many parts of the northern 

 states, and are usually readily distinguished from either the 

 blackberry or the dewberry by the half-erect habit, the broad and 

 jagged leaflets, the forking, small flower-clusters, and the small, 

 loose-grained fruits. In gardens, offsprings of this cross are the 

 Wilson, Wilson Jr., and Eathbun. These berries are valuable 

 for certain purposes, but ordinarily demand special care and treat- 

 ment, and are, therefore, not adapted to wide ranges of conditions. 



9. RUBUS ALLEGHENIENSIS Porter, Bull. Torr. Bot. Club, xxiii. 



153 (1896). R. villosus var. montanus Porter, I.e. xvii. 



15 (1890). R. montanus Porter, 1. c. xxi. 120 (1894) not 



Wirtg. Mountain Blackberry. 



Plant smaller than the preceding species, and rather more 

 slender and less prickly; the branches and leaf -stalks commonly 

 reddish, and all the recent parts very prominently glandular; 

 leaves much as in R. nigrobaccus, with small teeth and distinctly 

 long-pointed, prominently pubescent below; fruit small, long and 

 narrow, tapering towards the top ; drupelets numerous and small, 

 forming a dry fruit with spicy flavor. This species occurs on 

 mountains from New York to North Carolina. In its typical 

 forms, it is very well marked, and seems to be worthy specific 

 rank; but in intermediate stations, it seems to grade into the 

 species (p. 370). It has given no horticultural forms. 



BBBB. Plant diffuse or strict, mostly tall, thorny or unarmed, 

 with no (or very little) glandular pubescence; fruits black. 



10. KUBCS ARGUTUS Link, Enum. Hort. Berol. ii. 60 (1822). 



R. frondosus Bigel., PI. Bost. ed. 2, 199 (1824). R. villosus 

 var. frondosus Torr., PI. U. S. i. 487 (1824). R. suberectus 

 Hook., PI. Bor.-Am. i. 179 (1833). Leafy-cluster Black- 

 berry (Figs. 64, 65, 90). 



A plant of comparatively stiff and straight growth, usually 

 distinctly dwarfer than R. nigrobaccus, with shorter pointed, often 

 narrower and usually more rigid leaflets; stems strong and 



