plants generally tend to flower a little before the short-styled: for instance,
I had twelve plants of each form growing in separate pots and treated in every
respect alike; and at the time when only a single short-styled plant was in
flower, seven of the long-styled had expanded their flowers.

We shall, also, presently see that the short-styled plants produce more seed
than the long-styled. It is remarkable, according to Professor Oliver, that the
ovules in the unexpanded and unimpregnated flowers of the latter are
considerably larger than those of the short-styled flowers (1/3. 'Natural
History Review' July 1862 page 237.); and this I suppose is connected with the
long-styled flowers producing fewer seeds, so that the ovules have more space
and nourishment for rapid development.

To sum up the differences:--The long-styled plants have a much longer pistil,
with a globular and much rougher stigma, standing high above the anthers. The
stamens are short; the grains of pollen smaller and oblong in shape. The upper
half of the tube of the corolla is more expanded. The number of seeds produced
is smaller and the ovules larger. The plants tend to flower first.

The short-styled plants have a short pistil, half the length of the tube of the
corolla, with a smooth depressed stigma standing beneath the anthers. The
stamens are long; the grains of pollen are spherical and larger. The tube of the
corolla is of uniform diameter except close to the upper end. The number of
seeds produced is larger.

I have examined a large number of flowers; and though the shape of the stigma
and the length of the pistil both vary, especially in the short-styled form, I
have never met with any transitional states between the two forms in plants
growing in a state of nature. There is never the slightest doubt under which
form a plant ought to be classed. The two kinds of flowers are never found on