[Suteria (species unnamed in the herbarium at Kew.) (Rubiaceae).
I owe to the kindness of Fritz Muller dried flowers of this plant from St.
Catharina, in Brazil. In the long-styled form the stigma stands in the mouth of
the corolla, above the anthers, which latter are enclosed within the tube, but
only a short way down. In the short-styled form the anthers are placed in the
mouth of the corolla above the stigma, which occupies the same position as the
anthers in the other form, being seated only a short way down the tube.
Therefore the pistil of the long-styled form does not exceed in length that of
the short-styled in nearly so great a degree as in many other Rubiaceae.
Nevertheless there is a considerable difference in the size of the pollen-grains
in the two forms; for, as Fritz Muller informs me, those of the short-styled are
to those of the long-styled as 100 to 75 in diameter.
Houstonia coerulea (Rubiaceae).
Professor Asa Gray has been so kind as to send me an abstract of some
observations made by Dr. Rothrock on this plant. The pistil is exserted in the
one form and the stamens in the other, as has long been observed. The stigmas of
the long-styled form are shorter, stouter, and far more hispid than in the other
form. The stigmatic hairs or papillae on the former are .04 millimetres, and on
the latter only .
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