Phytogeographical Excursion in the British Isles. 121 
what is apparently a hybrid between Mackayi and tetvalix. The 
leaves of the true E. tetralix are hairy (downy) on the upper side 
quite apart from the long gland-tipped hairs on their edges which 
make them ciliate. The flower-stalks, the sepals and the upper 
parts of the stems are also downy or tomentose, and the ovary is 
densely hairy. All these characteristics are expressions, according 
to my view, of only one character, viz., hairiness (tomentum); and 
this character is absent in E. Mackayi which has only the glandular 
hairs (also present in E. tetralix). Consequently in E. Mackayi the 
upper sides of the leaves, the sepals and the ovaries, are glabrous, 
while the flower-stalks and the upper part of the stem are glandular. 
Besides this character, the two species differ from each other in the 
shapes of the corolla and of the leaves. Both produce ripe seeds. 
When collecting both E. Mackayi and E. tetralix on Craigga 
More near Roundstone (Co. Galway), I was struck with some 
individuals which did not answer well to either of the two species, 
and now having examined the material brought home, 1 feel 
convinced that we have here a hybrid between the two species. As 
far as I remember it was not rare at the place (I have three col¬ 
lection numbers) and it shows in that respect a parallelism to the 
fairly abundant occurrence of E. Watsoni Benth. (£. ciliaris L. x 
tetralix) at Perranwell, near Truro (Cornwall) with its two parents. 
The hybrid from Craigga More stands in its characters between 
its supposed parents ; it has an ovary which is glabrous with the 
exception of some hairs on the ridges ; the leaves are broader than 
in E. tetralix, but much more revolute than in E. Mackayi ; they 
are nearly glabrous above, and the tomentum on the upper parts 
of the stems and on the flower-stalks is not dense as in E. tetralix ; 
the outer side of the sepals are only very faintly hairy. 1 have not 
succeeded in finding any fully developed ovary containing good 
seeds ; and I suppose the plant to be sterile. 
Upon these characters 1 have based my supposition that the 
specimens are of hybrid origin and I think it is not possible to 
determine the question more nearly without making crossing 
experiments, the only absolutely decisive proof in this matter. I 
have named it in honour of our excellent guide in Ireland, Mr. R. 
Lloyd Praeger of Dublin. 
GeNTIANACE/E. 
Gentiana campestris L. 
The sub-sp .germanica (Froel.) Murb. (the common British plant 
I suppose) was found near Dunkeld, Perthshire. 
The sub-sp. baltica Murb. (pro-specie) was found at Southport 
(golf-links on the dunes) and at Ballyvaghan, Co. Clare. 
Gentiana amarella L. 
All the plants seen belong to sub-sp. axillaris (Schmidt) Muzb., 
viz., those from Ireland: Ballyvaghan, Co. Clare ; England : Butser 
Hill, W. S ussex; Kingley Vale, W. Sussex; Haweswater near 
Silverdale, Lancashire; Southport, golf-links. 
SCROPHULARIACE/E. 
Alectorolophns ( Rhinanthns) minor (Ehrh.) Wimm. and Grab. 
When studying the segregates of A led. minor in northern 
