STRUCTURE OF IMPATIENS FULVA. 153 
To this I may append some remarks by Prof. Asa Gray in 
an article on * Dimorphism in the Genitalia of Flowers," in Dr. 
Seemann's ‘ Journal of Botany, vol. i. p. 147, quoted from the 
‘American Journal of Science and Art, vol. xxxiv., with cor- 
rections by the author:—“ The second case, which belongs to 
structural hermaphrodite flowers, is practically the reverse of 
the first. It is the case in which, besides the normal flowers of 
the species, which, for the most part, are rarely or sparingly 
fertile, other flowers are produced which never open, their de- 
velopment being, as it were, arrested in the bud, but which are 
very prolific of seed. Here the stigma is, and must needs be, ferti- 
lized by pollen from anthers of the same flower, the two being 
shut up together in the same closed bud. The acaulescent 
violets and the common wild species of Impatiens are good ex- 
amples of this kind. In fact, impregnation is effected, as it were, 
in the early bud, wherefore we have indicated these as cases of 
precocious fertilization. Here the. pollen is unusually active, 
sending out its tubes while still in the anther, and thereby, as in 
Impatiens &e., attaching the anthers to the stigma. We leave 
it to Mr. Darwin's sagacity to ascertain the end in the opposite 
case, noting that here the mostu ndoubted close fertilization for 
infinite generations shows no apparent tendency towards ste- 
rility, but rather the contrary." 
EXPLANATION OF PLATE III. 
Fig. 1. Bud of conspicuous flower, early stage. 
a. Apex of lateral sepals. 
. Bud of inconspicuous flower, early stage. 
a. Apex of lateral sepals. 
. Bud of conspicuous flower, lateral sepals removed. 
a. Spur of posterior sepal. 
. Bud of inconspicuous flower, lateral sepals removed. 
. Andrecium from conspicuous flower. 
. Single stamen from conspicuous flower. 
. Andrecium from conspicuous flower, cut open to show position of 
H co bo 
“TIS on 
pistil. 
a. Membranous wing attached to posterior filaments, 
b. Projection from anterior filament. 
8. Andreecium from conspicuous flower, pistil removed. 
9. Calyx and corolla partially detached from pistil of inconspicuous 
flower. 
10. Stamen from inconspicuous flower, early stage. 
11. Stamens from inconspicuous flower, later stage. 
