188 MR. MILLER CHRISTY ON 
Flora of Norfolk’ (1889 ?, p. 47), gives “ Flordon, May 1870," 
as another locality for the True Oxlip; but, as my friend 
Mr. Edward Corder, of Norwich, has carefully searched this 
parish and found no trace of it, I conclude that Trimmer 
record relates to the Common (Hybrid) Oxlip. 
The existence of at least two outlying localities for P. elatior 
(which I definitely established only this year) greatly surprised 
me, as my previous observations, extending over many years, had 
not led me to expect anything of the kind. Probably they (and 
any others like them which may exist) may be regarded (for 
reasons to be given hereafter) as evidence of a former greater 
extension of the Oxlip-Area. Along the southern boundary-line 
of the Oxlip-Area, I know of no outlying localities for the 
species, and I believe that none such exist. 
I am, of course, not in a position to assert that the True Oxlip 
does nof occur in any other part of Britain; but I have no 
reason to suppose that it does. Its name appears, it is true, in 
scores of Local Lists of Plants covering the greater part of 
Britain; but I believe (as already stated) that all these records 
relate to the Hybrid Oxlip (P. acaulis x veris). Years ago, the 
Rev. W. W. Newbould informed me, on the authority of Professor 
W. Hillhouse, that it grew at Clapham and Marston, in Bedford- 
shire; but dried specimens and information kindly supplied to 
me by the latter gentleman have caused me to doubt the truth of 
the statement. 
It will be found that the two Districts forming the Oxlip-Are 
and the two outlying localities extend into seven of Watson's 
Botanical * Counties "' (Nos. 19, 20, 25, 26, 27, 29, and 31), 
instead of the six in which the plant is said to oceur in the last 
edition of the * London Catalogue, wherein Bedfordshire (which 
I have excluded) is admitted. 
It may well be asked: What physieal fact or facts govern the 
Distribution in Britain of Primula elatior and cause the Are 
occupied by it to be so comparatively limited and so very sharply 
defined and to assume such a remarkable configuration ? An 
examination of any map will go some way towards providing 92 
auswer. It will be seen, in the first place, that the Area 1 
question is, comparatively speaking, an elevated one—in fact 
a “height of land” or watershed from which rivers run down 
in all directions. It is, though limited in extent, as near an 
