214 ENGLISH BOTANY. 
ovate-cordate, acute. Catkins opening at the same time as the leaf- 
buds, on short lateral branches, with 2 or 3 leaves at the base, sub- 
erect, cylindrical, rather thick, dense. Catkin-scales lanceolate-strap- 
shaped or ovate-strapshaped, pilose with very long white hairs inside 
and shorter ones outside. Male flowers unknown (?). Capsule 
ovate-conical, glabrous (pubescent in continental specimens), on a 
stalk about twice as long as the nectary; style elongated; stigmas 
shorter than the style, bifid, divaricate. Young branches and young 
leaves more or less pubescent. 
By the banks of rivers and in osier grounds. Rare, and perhaps 
not native. Near Lewes, Sussex, Mr. Woolgar, confirmed by Borrer; 
Surrey side of the Thames, Mr. Baker; Audley End, Essex, Rey. J. E. 
Leefe; Otley, N.E. Yorkshire, Mr. Baker. In Scotland it is reported 
from Forfarshire by Don. In Ireland it occurs in the north, especially 
about Coleraine, but only where planted. 
England, [Scotland, Ireland.] Tree. Late Spring. 
A small tree, casting its bark annually, like S. triandra, with shortly 
stalked subcoriaceous leaves, 3 to 5 inches long by 4 to 1 inch wide, 
sometimes undulated at the margins. It is doubtful if the male 
flowers of this plant be known, as Andersson considers that the sup- 
posed sterile catkins described by Ehrhart belonged to S. triandra. 
Grenier describes the male flowers as diandrous. The female catkins 
are about 1 inch long while in flower, with yellow silky scales, variable 
in shape, much shorter than the ovary, with very long hairs towards 
the apex, often equalling or exceeding the style. Ovary green or 
olive, smooth and glabrous, at least in all the British specimens. 
S. undulata is generally admitted to be a hybrid, of which one of 
the parents is S. triandra. Wimmer considers the other to be S. alba, 
but Andersson now, and Wimmer formerly, considered 8. viminalis to 
be the other parent, which to me seems much more probable. In 
either case its affinities are greatest with S. triandra, from which it is 
readily known by its villous catkin-scales, shorter. stalked capsules, 
and elongated style. The stipules are also smaller and more acute. 
The catkins bear considerable resemblance to those of S. viminalis, 
which, however, it does not resemble in either its foliage or stipules. 
It is in the leaves that it differs from the plant now considered by 
Wimmer as S. triandra-viminalis, including 5. mollissima of Lhrhart 
and S. hippophiifolia, Thuillier, and 8. Trevirani, Sprengel., which in 
foliage show a much closer approach to S. viminalis, but it seems to 
me the whole of these and S. undulata are a series of hybrids between 
S. triandra and 8. viminalis. 
Sharp-stipuled Triandrous Willow. 
French, Saule olivdtre. German, Wellenblattrige Weide. 
