436 THE BOTANICAL EXCHANGE CLUB OK THE BRITISH ISLES. 
ripens fruit frequently. The specimens sent show the form frequent 
in the richer soil, e.g. of gardens, or in ditches on the clay. — H. J. 
Riddelsdell. All states of this plant may be seen in my garden ; 
on dry banks the lobes of the leaf are so davaricate that the leaf 
is triangular, while in fat soil under a damp wall grows the best 
var. incumbens I ever saw — the nodal rooting tuber forming is 
common. — S. H. Bickham. 
Fumaria Borai^ Jord. ? Waste ground, near Kivernells, Mil- 
ford-on-Sea, S. Hants , v.-c. ii, August, 1909 — J. C. Melvill. 
A form of F. Bored., Jord., gathered late, and intermediate between 
the type and var. serotina, Clavaud. — H. W. Pugsley. 
Radicula amphibia X R. palustris. By River 'I'hames between 
Putney and Barnes, Surrey, v.-c. 17. — C. E. Britton. 
In ‘Journal of Botany,’ p. 430, 1909, I record the occurrence 
of this hybrid, and briefly point out its characteristics. The series 
sent for distribution will enable the members to judge for them- 
selves as to its origin. I suppose its affinity is most marked towards 
Radicula palustris, but the influence of R. amphibia is unmistak- 
able. 
The following notes were made from the living plants — 
Stems many, erect, branched above, tall, almost as stout as 
those of Radicula amphibia. Leaves lanceolate in outline deeply 
pinnatifid, lateral lobes linear-lanceolate, irregularly lobed or almost 
entire, four to six pairs in number, terminal lobe almost half the 
length of leaf, tapering and shallowly irregularly lobed. 
The flowers of the hybrid and the parent species are contrasted 
below. 
R. atnphibia. 
Petals about twice as 
long as sepals, spread- 
ing in upper part. 
Stamens prominent, 
longer than the petals 
or pistil and first pro- 
truded from the open- 
ing flower. 
Flowers adapted for 
cross-fertilisation and 
frequently failing to 
set seed. 
R. amphibia x palustris. 
Petals one-fourth or one- 
third longer than 
sepals, ultimately 
spreading in upper 
part. 
Stamens included, 
scarcely as long as 
pistil, which is first 
protruded from the 
opening flower. 
Flowers infertile, anthers ' 
not dehiscing and pol j 
len grains not formed. , 
R. palustris. 
Petals erect shorter or as 
long as sepals. 
Stamens included, as 
long as pistil, and 
with the stigma simul- 
taneously protruded 
from the opening 
flower. 
Flowers apparently self- 
fertile and seed abun- 
dantly produced. 
The hybrid is very noticeable owing to the much-branched 
inflorescence with its abundant aborted silicules which are inter- 
mediate in shape between those of R. amphibia and R. palustris. 
