In the short-styled
form, the stigma stands some way down the tube of the corolla, nearly on a level
with the lower anthers of the other form: it differs remarkably from the stigma
of the long-styled form, in being more papillose, and in being longer in the
ratio of 100 to 60. The anthers of the upper stamens in the short-styled form
are supported on free filaments, and project above the throat of the corolla,
whilst the anthers of the lower stamens are seated in the throat on a level with
the upper stamens of the other form. The diameters of a considerable number of
grains from both sets of anthers in both forms were measured, but they did not
differ in any trustworthy degree. The mean diameter of twenty-two grains from
the short-styled flower was to that of twenty-four grains from the long-styled,
as 100 to 99. The anthers of the upper stamens in the short-styled form appeared
to be poorly developed, and contained a considerable number of shrivelled grains
which were omitted in striking the above average. Notwithstanding the fact of
the pollen-grains from the two forms not differing in diameter in any
appreciable degree, there can hardly be a doubt from the great difference in the
two forms in the length of the pistil, and especially of the stigma, together
with its more papillose condition in the short-styled form, that the present
species is truly heterostyled.
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