nivalis, P. Hentzii), and is apt to have a pair of ovules
in each cell, while the long-styled P. subulata rarely shows more than one."
(3/18. 'Proceedings of the American Academy of Arts and Sciences' June 14, 1870
page 248.) Some dried flowers of both forms were sent me by him, and I received
others from Kew, but I have failed to make out whether the species is
heterostyled. In two flowers of nearly equal size, the pistil of the long-styled
form was twice as long as that of the short-styled; but in other cases the
difference was not nearly so great. The stigma of the long-styled pistil stands
nearly in the throat of the corolla; whilst in the short-styled it is placed low
down--sometimes very low down in the tube, for it varies greatly in position.
The stigma is more papillose, and of greater length (in one instance in the
ratio of 100 to 67), in the short-styled flowers than in the long-styled. My son
measured twenty pollen-grains from a short-styled flower, and nine from a long-
styled, and the former were in diameter to the latter as 100 to 93; and this
difference accords with the belief that the plant is heterostyled. But the
grains from the short-styled varied much in diameter. He afterwards measured ten
grains from a distinct long-styled flower, and ten from another plant of the
same form, and these grains differed in diameter in the ratio of 100 to 90.
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