198 - 
not give ita number. The appearance of the mature capsule led 
us to take specimens May 17th, and the leaves and buds confirm 
our surmise that this too isan errant form. A peculiar fact is that 
the plant resembles strongly S. candida in its floral and fruiting 
characters, while it resembles just as strongly S. corda‘a in its 
leaf and stem characters. The capsule is densely tomentose and 
the tomentum is in texture and color like that upon the capsules 
of S. candida. Older leaves are nearly smooth and are rugose 
above, whitened and silky below, the younger ones are covered 
with scattered white tomentum both above and below. The 
youngest leaves on the shoot which were still unrolled July 13th, 
are densely white-tomentose. The mature leaves are rounded at 
the base, with lanceolate-acuminate outline, and have revolute and 
very obscurely dentate margins. The stipules are obliquely ovate, 
broad and toothed, prominently veiny below and longer than the 
petioles. 
No. 90 is another individual which is evidently intermediate 
between S. candida and S. cordata. Only the mature leaves and 
buds are available for study. These are sufficient to show that — 
S. candida. has some influence in this plant, although at time of 
flowering the plant was thought to be S. cordata. Another season’s 
observations are necessary to determine the place no. 90 should 
have. 
It seems very certain that these individuals are hybrids between 
S. candida and S. cordata. The isolation of the former species in 
this region and the very pronounced characteristics which it pos- 
sesses makes it a comparatively easy matter to detect a relation- 
ship between the forms here described and the typical S. candida. 
The other element in the mixture is not so constant and well 
defined. Mr. Bebb in his Notes upon N. A. Willows (Bot. Gaz. 
16: 104, 1891), says, “ No American willow has a wider distribu- 
tion than this (S. cordata). * * * * None other presents 
more the appearance of a ‘congeries of species in the making.’ 
* * * * Of all our willows, (it is) the one which hybridizes 
most freely with others, and this implies that even where actual 
hybridity cannot be proven, it is more or less effected by associa- 
tion with other willows in different portions of this wide area of — 
distribution.” 
