HOFFMANN: FLORA OF BERKSHIRE COUNTY. 287 



— (R. idacus L., var. aculcatissimus Man. ed. 7 in part. R. strigosus 

 111. Fl. ed. 2. Vid. Rhodora, 21: 96, 1919.) 



Rocky })astur('s and clearinfijs; common. 



X? R. neglectus Peck. — Open hillsides and pastures; frequent in 

 the valley. Probably a self-perpetuating hybrid between R. occi- 

 dniffilfs and R. idacus, var. strigosus. 



R. nigricans llydb. — Borders of swamps and wet roadsides on the 

 plateau; occa.sional. Florida; Washington. 



R. occidentalis L. Black R.\spberry; Thimblebebry. — Open 

 rocky woods, pastures, clearings and roadside thickets; common in 

 the valley. Not noted on the plateau proper. 



R. odoratus L. Purple Flowering Raspberry. — Openings 

 and clearings in ricli woods, banks of streams and shaded ledges; 

 common on the upland and in the lower parts of the plateau. Not 

 noted on tl'.c summit (;f tiie plateau. 



R. pergratus Blanchard. — Rocky pastures, dry open hillsides and 

 moist woodland; common. 



R. plicatifolius Blanchard.— Vid. Rhodora, 8: 149 (1906). 



Roadsides; occasional. Sandisfield; Sheffield. 



A prostrate species related to R. villosus Ait., distinguished by the 

 straight prickles, the plaited or ruffled margins of the leaves and the 

 fact that its inflorescence is a broad raceme. 



R. pubescens Raf. Dwarf Raspberry. — (R. iriflorns Man. ed. 

 7 and 111. Fl. ed. 2; vid. Rhodora, 11: 236, 1909.) 



Rich rocky woods, swamps and wet woods; common. 



R. recurvans Blanchard. — Open woods, clearings and low ground; 

 fr('(|U('nt. 



R. setosus Bigel. — Swampy meadows and low ground; frequent 

 on the plateau. 



R. villosus .\it. Dewberry. — ^ {R. procumhcus III. I'l. ed. 2.) 



Dry fields and rocky summits; common. 



var. humifusus T. &. G. — Dry open fields; occasional. Flood- 

 [)laiii()f theDeerfield R., Florida; Stc.ckbridge; Monterey; Kgremont. 



As is well known, the division I'.uhafiis of the genus Ruhiis presents 

 a problem of extreme difficulty. Much of the Riihtts collected in 

 Berkshire is not easily determined in accordance with the treatment so 

 far i)ul)lished. Forms are common, particularly on the upland, which 

 might be referred to R. jiiurrus Blanchard or to li. nigrintns Kydb. 

 They appear to lie hybrids between R. raiutdvnsis and li. hispidus. 



