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Página 109 - Habitu a S. petiolari majori et typica valde recedit sed modificationibus permultis cum ea intime connexa est. Indumentum foliorum idem, ut etiam capsularum, sed forma in hac angustior magisque elongata. Ramis in forma arbusculae humilis erectis, foliis angustis et amentis primum subglobosis habitum S.
Página 211 - to ¿. Good specific characters frequently disappear in the drying process,—for instance the furrowed shoots of S. amygdalina, which afford an excellent mark of distinction from S. Hoffmanniana in fresh specimens, cannot be relied upon when the specimens are dry, owing to the
Página 209 - Another source of confusion is the practice of collecting specimens, without numbering them and the tree, trusting subsequently for identification to the memory alone, whereby a most unpleasant feeling of uncertainty is produced. The changes in the form of the leaves,
Página 210 - be no mistake), should be such as to present one or more regular series illustrative of the progressive development of the catkins, each set being taken from the same tree at intervals during the flowering
Página 209 - Whoever would study the willows with success, must see them growing at different seasons of the year ; for fragments gathered at one season only, serve but to perplex and confuse the botanist,
Página 210 - that at least two specimens of the leaves, gathered at different periods, should be preserved, so as to show the form of the stipules, and the progressive alteration in the
Página 209 - in the relative proportion of some of the parts of fructification at different periods of growth, are often so surprising, that without a mark of recognition, I should frequently have
Página 210 - that thin sections of a catkin of each species, perpendicular to the axis, should be gummed down, by which means the form of the ovarium and any other particular respecting
Página 209 - whether my specimens had been all collected from the same tree. Again, it is a common practice to select for preservation the largest and most vigorous-looking
Página 210 - in a given length of the spiral, could easily be seen without mutilating the other specimens. The exact date also of each specimen should be registered, whereby many ambiguities would be removed. For instance, it is common to find characters derived from the relative proportion borne by the nectary to the ovarium ; but this varies greatly, as a dated series of specimens would immediately make evident,—sometimes, as in the