NATURAL HYBRIDS. 161 
Localities known to me 
Rubus rusticanus Merc. x R. affinis, var. Briggs- Several: Dey., Cornw., 
ianus, Rogers Dors. 
xcesius, Linn. . - Many: Dors., Somers., 
&e. 
x corylifolius, Sm. . One: Dors. (certainly 
elsewhere) 
xholerythros, Focke . One: Surrey 
xargenteus, Wh. d N.. One: Somerset 
- xleucostachys, Schleich. Many: Dors., Hants, 
Heref., Glam., 
Derby, Wore. 
x mutabilis, Gener. . One: Surrey 
x Lindleianus, Lees . One: Surrey 
leucostachys, Schleich. x corylifolius, Sm. One: Somers.  (cer- 
tainly frequent else- 
where) 
x imbricatus, Hort. . One: Surrey 
; x pulcherrimus, Newm. . One: Surrey 
x Sprengelii, Wethe . One: Derby 
x Marshalli, Focke & 
Ffiogers . - One: Surrey 
xfoliosus, Wh. dN. . One: Kent 
cesius, L.xIdeus, L., R. Pseudo-ideus, Four: Dors., Hants, 
Lej. Surrey, Staffs. 
holerythros, Focke x Sprengelii, Weihe . One: Surrey 
Lindleianus, Lees, x Radula, Weihe . One: Derby 
mucronatus, Blox. x rosaceus, subsp. in- 
fecundus, Fogers. One: Herefordshire 
anglo-saxonicus, Gelert xrudis, Weihe . One: Derby 
xits subsp. rie 
Rogers . : One: Herefordshire 
The above list of hybrid Rubi was kindly sent to me by the Rey. W. 
Moyle Rogers, an accepted authority on British brambles and author of 
ae Handbook of British Rubi.” He writes: “The foregoing two lists 
(I have made them one) are certainly not exhaustive for British Rubi 
hybrids. They omit especially a considerable number of the bewildering 
forms of hybrid origin which are almost invariably frequent in districts 
where the group Ce@sii is strongly represented.’ He also informs me that 
beyond all question they are fairly numerous in some neighbourhoods, 
though not nearly so frequent as some suppose, and he expresses the 
opinion that they are usually infrequent except on clay soils. All the 
above are represented in Mr. Moyle Rogers’s herbarium, with the exception 
of the last under Ff. rusticanus and the last under FR. leucostachys 
tGeum urbanum x rivale (G. intermedium Ehrh.) 
This plant has long been recognised as a “species,” and its hybrid 
nature has been proved experimentally by Bell-Salter. 
Rosa spinosissima x canina (R. hibernica, Sm.) 
x villosa, tomentosa, &¢c. (R, involuta, Si.) 
“ Babington’s Manual,” 9th ed. H. & J. Groves. 
