salicaria, the pistil of which and the corresponding stamens in the other two
forms closely resemble those of L. hyssopifolia. According to Vaucher and Lecoq,
this species, which is an annual, generally grows almost solitarily (4/9.
'Geograph. Bot. de l'Europe' tome 6 1857 page 157.), whereas the three preceding
species are social; and this fact alone would almost have convinced me that L.
hyssopifolia was not heterostyled, as such plants cannot habitually live
isolated any better than one sex of a dioecious species.
We thus see that within this genus some species are heterostyled and trimorphic;
one apparently heterostyled and dimorphic, and one homostyled.
Nesaea verticillata.
I raised a number of plants from seed sent me by Professor Asa Gray, and they
presented three forms. These differed from one another in the proportional
lengths of their organs of fructification and in all respects, in very nearly
the same way as the three forms of Lythrum Graefferi. The green pollen-grains
from the longest stamens, measured along their longer axis and not distended
with water, were 13/7000 of an inch in length; those from the mid-length stamens
9 to 10/7000, and those from the shortest stamens 8 to 9/7000 of an inch. So
that the largest pollen-grains are to the smallest in diameter as 100 to 65.
This plant inhabits swampy ground in the United States.
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