I9I4- 
RiDDKLSDK LL. — Hclosciadin?/i Moorei. 
1 
inundatum than nodiflorum. This failure to develop is not 
due to the plant being a late tiowerer ; man}^ of the Irish 
specimens were gathered in July ; flowers are showing, 
even in June. Whether the specimen is early or late gathered, 
the failure to develope fruit is constant. 
Habitat. — The Irish plant grows in ditches or along the 
margins of slow streams, generally floating and forming a 
tangled mass of stems, the upper portions of which are 
aerial, rising several inches (6 or 9, if supported by other 
vegetation) above the surface. It becomes terrestrial only 
during periods of exceptionally low water. 
The plant propagates itself vegetatively. — Broken ol^ pieces 
of leaf take root and form separate plants. This is, no 
doubt, the reason why in any given area the form found 
there is homogeneous. 
The range of variation is thus, in some respects, par- 
ticularly those which concern vegetative characters, very 
great. Taking two well-contrasted forms, say, that from 
Tuam, N.E. Galway (which by the kindness of Mr. Praeger; 
I have now growing in my garden), and that from Portumna, 
S.E. Galway (to be seen in many herbaria from gatherings 
made by E. F. and W. R. Linton in 1885), we might 
illuminate the subject by naming them respectively /. 
suhinundatum and /. subnodiflomm. The former is, indeed, 
much larger than most inundatum, and the latter smaller 
than most nodiflorum. But the foliage of the former is 
clearly near that of inundatum ; it is broader and longer 
in all its parts and as a whole ; capillary segments become 
linear, lobes are larger and broader, and even tend to merge 
into each other ; but it is of essentially the same character. 
The texture of this form is more that of a ' water-plant ' ; 
whereas in f. subnodiflorum the texture reminds one of small 
dry -land (or mud) forms of nodiflorum. This latter form of 
M oorei has the leaflets far less cut : in the upper leaves they 
are very near nodiflorum in character, but in the lower 
leaves are strongly toothed or lobed. The floral characters 
separate it from nodiflorum. 
The Haxey gathering (G. Webster, 1881 and 1884) 
deserves special notice. It differs from all others in one 
important respect, its variability, to wit. Most localities 
