4 
The Irish Nahiralisf. 
January, 
is very like (although smaller) A. inundatum, var. Moorei. 
Herr Freyn considers it to be ^4. inundatum, G. C. Druce." 
W. R. Linton, in his Flora of Derbyshire, p. 159, says, 
under Apium inundatum : "A form occurs near Renishaw, 
on the edge of the canal, with many aerial leaves and no 
submerged ones but Mr. Druce " collected it with wholly 
submerged leaves in October" [1911] ; see B. E. C. Rep., 
1911, p, 96. 
In B. E. C. Report, 1911, p. 20-21. Mr. Druce raised 
the form to the status of a species, as Apium Moorei 
(Syme) mihi,' quoting it from Derbyshire and Lincoln N. 
He refers at the end of the paragraph to the foliage, the 
larger style (than in H. inundatum), and 5-6 bracteated 
involucel as distinctive ; and I agree with him that these 
(and other) features collectively may be enough to mark 
off a good species. But I venture to dissent from his opinion, 
given earlier in the same paragraph, to the effect that : 
' ' This has good claims to be considered a species from the 
character of its leaves, both in the aquatic and terrestrial 
states ; " for leaf -character is, in my opinion, quite in- 
sufficient of itself, in any case that I can recall, to constitute 
a specific differentiation. Moreover, the leaf segments of 
Moorei in its most characteristic form are very largely a 
broadened and lengthened edition of those of inundatum. 
In the same report, p. 96, Mr. Druce refers to specimens 
actually distributed by him. He confirms his idea of 1897, 
that the Renishaw plant is identical with the Irish Moorei, 
and adds : " Dr. Hugo Gliick this year [1911] had been 
gathering the Irish plant, so I took him to see the Renishaw 
form, the specimens distributed [now] being the aquatic 
form, which grew there rather sparingly. I believe it to 
be a distinct species from either nodiflorum or inundatum,^'' 
The specimens bore no inflorescence. 
At this point I suggested to Mr. Druce the possibility of 
Syme's var. Moorei being a hybrid betv»^een the two 
common species, A. inundatum and A. nodiflorum. He 
replied by saying that this obvious suggestion was con- 
sidered and rejected by him and Dr. Gliick, when at Reni- 
shaw, on the ground that they saw " no intermediates," i.e., 
as I understood, no forms going off from Moorei towards 
nodiflorum or inundatum. 
