SAFFORD—CLASSIFICATION OF ANNONA, 3 
(torus), and a gynecium, composed of a cluster of carpels issuing 
from its center. 
The stamens (fig. 8, @) have a short filament, 2 linear, parallel 
pollen sacs opening extrosely by a longitudinal slit, and a connec- 
tive usually terminating in a swollen head or hoodlike process above 
the pollen sacs. These hoods are very closely 
packed until the flower reaches maturity 
(pl. 2) and serve like thatch or tiling to 
protect the pollen from moisture and from 
fungus spores. In some cases the connective 
tips are broadly expanded and velvety or 
clothed with hairs; in others they are fleshy 
points not exceeding the two pollen sacs in 
width, as in the section Annonella and its 
allies. In the pollen sacs the pollen grains % 
are arranged in columns of tetrads and are F16. 3.—Ussential parts of the 
: . flower of Annona muricata. 
usually of a yellowish color, but sometimes a, Stamens, one showing pol- 
nearly white and sometimes of a deep orange _1en sac dehiscing down the 
back; b, carpel. Scale 10. 
or amber color. 
The pistils (fig. 3, )) each consist of a single carpel. The ovary 
contains a single basal ovule and is usually clothed with appressed 
or ascending hairs. In most sections the ovaries are separate in 
the flower (discrete), as in Annona muricata and A. montana (pl. 8) ; 
in a few they are from the beginning united in a 
solid mass (concrete), as in A. glabra (fig. 19, p. 15). 
The ovaries are sometimes produced into processes 
which persist in the fruit as fleshy or hard points, 
as in A. muricata (pl. 1) and A. purpurea. Some- 
times the ovaries are comparatively long and slender, 
as shown in plate 33 sometimes, as in A. jenmanii 
(fig. 4), the ovary is comparatively short and bears a 
long, fleshy, club-shaped style terminating in a tuber- 
culate stigma. Usually the outer styles are more 
robust than the inner ones and their stigmas are 
more distinctly hairy or muriculate than those of 
Fic, 4.—Carpel of the latter, asin A. Aolosericea and A. nutans. These 
Annona jenmanii. outer styles together with their ovaries have in some 
Scale 20. . . 
cases been mistaken for sterile stamens, but they are 
essentially a part of the gynecium, of which they form the periphery, 
and the constriction between the style and ovary is usually distinctly 
marked. No such division or constriction is to be found in the sta- 
mens. As the time of pollination approaches a viscous fluid exudes 
from the stigmas, gluing together the styles and offering a medium 
