370 
Certain it is that the British species of Rubus often grow inter- 
mixed or in close proximity, and that the pollen is widely dis- 
tributed by numerous industrious bees, as may be observed on any 
sunny day. The intermediate character of many of the forms 
and the tendency to vary is notorious, so much so that in some 
cases it becomes difficult or even impossible to distinguish them. 
Further, the frequent occurrence of forms intermediate between 
well-marked species which happen to grow intermixed of itself 
suggests hybridity, and these intermediate forms often vary more 
than the well-defined species, and this often in the direction of one or 
the other of the supposed parents. It is now admitted that a large 
number of British willows formerly described as species are the 
result of the intercrossing of a comparatively small number of 
primary species, and it is not improbable that a similar condition of 
things obtains in Rubus, though the difficulty and intricacy of the 
subject delays its recognition. 
e classification and nomenclature adopted are those of 
Mr. Rogers’ Handbook of British Rubi (1900), and of his supple- 
mentary papers in the Journal of Botany (1909, pp. 310-318, 340- 
346). The numbers prefixed are those of the Handbook, and 
additions are indicated by an asterisk. “ Hb. K.” and “ Arb. Hb.” 
indicate that specimens are preserved in the General or the 
Arboretum Herbarium at Kew. 
Subgenus Iparopatus, Focke. 
_(1.) Rubus Idaeus, Z. Nicholson records a few clumps in Queen’s 
Cotta: unds, but these now seem to have disappeared : at all 
events we could not find any, 
Subgenus Eusatus, Focke. 
(Groups 1 and 2, Suberecti and Subrhamnifolii, appear to be 
absent.) 
Group 3. Rhamnifolii. 
(14.) R. carpinifolius, Weihe & Nees. Several bushes found in 
Queen’s Cottage grounds, and showing a certain amount of 
variation. Hb. K., Arb. Hb. 
(23.) R. pulcherrimus, Newm. Abundant in Queen’s Cottage 
— Probably the commonest of the Kew brambles, and one 
of the handsomest when in flower. Aptly named, Hb. K., 
Arb. Hb, 
Group 4, Villicaules. 
oil *R. status, Kocke, var. sciaphilus, Lange. (ueen’s Cottage 
ie 8; not common, specimens collected in August, 1908, 
r. tvogers remarks : Except for the stronger stem-prickles and 
