160 REPORT OF THE CONFERENCE ON GENETICS. 
and I may point out that any of the plants may possibly be found in some 
of the others works I have quoted. Each reference refers to all the plants 
back to the preceding reference. It is a rule in writing down a hybrid by 
the names of its parents, with a cross between, that the name first 
written should be that of the female parent. Here, however, the rule does 
not apply, because in very few cases is it known how the crossing took 
place, and in many cases probably the crossing may have happened both 
ways. In artificial crosses the rule is valuable. I have indicated by 
means of an asterisk a few of the genera which I believe may best lend 
themselves either to observation or manipulation combined with easy 
cultivation and early result, and, by means of a dagger, I have pointed out 
some of the most remarkable and interesting of the hybrids. I have 
especially to thank the Rey. E. F. Linton for a list of the British hybrids 
of Willow, and the Rey. W. Moyle Rogers for an especially prepared list 
of hybrid Rubi. I have attempted no critical work or verification, and 
I can hope only that something may prove suggestive. 
I. Brivisy. 
Ranunculus Baudotit x Drouetii 
x heterophyllus 
peltatus x Lenormandi (R. Hiltoni, H. & J. Groves) 
(See figure in “ Journal of Botany,” 1901, p. 121.) 
x trichophyllus 
“ Babington’s Manual,” 9th ed. H. & J. Groves. 
Viola canina x lactea 
Chatteris, Cambs. 
x stagnina 
~ odorata x hirta (VY. permixta, Jord.) 
Riviniana x canina 
sylvestris x Riviniana 
In Surrey with parents. 
‘“‘ Babineton’s Manual,” 9th ed. H. & J. Groves. 
* tricolor—the forms and subspecies of this very variable species 
are probably deserving of attention for experimental 
work.—A. J. L. 
Drosera anglica x rotundifolia (D. obovata, Mert. & Koch) 
D. obovata is recognised as a hybrid in 9th ed. of the ‘ London 
Catalogue of British Plants.” 
*Dianthus deltoides x Armeria 
See Continental list of hybrids. This cross occurs in Germany, but is 
not recorded for Britain. Species of this genus are probably very 
suitable for experimental work. 
Potentilla procumbens x reptans (P. mixta, Nolte) 
x Tormentilla (P. suberecta, Zimmeter) 
reptans x Tormentilla (P. italica, Lehm.) 
“Journal of Botany,” 1893, p. 825. “Some British Potentilla’ 
Hybrids,” by the Rey. E. S. Marshall, M.A. 
Dr. Focke remarks that, ‘as P. procwmbens is usually associated with 
P. Tormentilla, the hybrid forms may be almost universally found 
where P. procumbens grows, often far more frequent than it.” 
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