20 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
This group includes, in addition to the type, a single species, Annona macro- 
prophyllata Donn. Smith (pl. 26), to be redescribed below. It is cheifly distin- 
guished from the other groups by the presence of 
broadly ovate or orbicular, amplexicaul, leaflike 
bracts at the base of the peduncle and of flower- 
ing branchlets. In shape the flowers suggest those 
of the section Atta, but the petals open to the base 
and the inner petals when present are stamen-like 
and bear rudimenary pollen sacs (fig. 28). The 
fruit of the type species (pl. 5) is large, fleshy, 
and aromatic, with the juicy pulp frequently pink 
or rose-tinted. It is shaped “like a pineapple 
cheese” and is usu- 
ally covered with 
large stout protuber- 
ances, though some- 
times these are 
Fic. 28.—Flower of Annona di- lacking in fruits of 
versifolia, Base of fower with the same tree, as 
an outer petal removed and ghown in the lower 
(a) inner petal with rudimen- right-hand corner of Fig. 29.—(a) Seed of Annona 
tary pollen sacs. From type diversifolia and (0) one of 
specimen. Scale 4. plate 5. The seeds A.cherimola. Natural size. 
(fig. 29, @) differ 
from those of all other Annonas known to the writer in having a hard, thick, 
smooth, terete testa, like the shell of a hazel nut. 
Section 12. SAXIGENA sect. nov. 
Type species, Annona bullata A. Rich. (pls. 27, 28). 
The shrubs and small trees composing this section bear a general resemblance 
to those of the section Atta; but the leaves are remarkable for the close network 
of prominent veins between the lateral nerves (figs. 30, 31), and the stamens, 
instead of having the connective terminal broadly expanded into a hood above 
the pollen sacs, usually have it produced into a 
short, fleshy, obtuse 
tip scarcely equaling 
the breadth of the \ 
two pollen sacs, thus 
approaching those 
of the group An- 
nonellae. In addi- 
tion to the type 
species this section 
includes the closely 
allied Annona cras- 
sivenia (pls. 29, 30), 
the remarkably re- 
ticulated suborbicu- Fic. 31.—Leaves of Annona crassi- 
venia, From specimens collected 
lar leaf of which by Van Hermann as cited. Scale4. 
is shown in the 
accompanying illustration (fig. 31). The fruit (fig. 32) resembles that of a 
’ chirimoya in general appearance. 
Fig. 30.—Leaves of Annona 
bullata. Scale 3. 
EXPLANATION OF PLatTy 5.—Field photographs received through American consul, 
Marion Letcher, taken near Acapulco, State of Guerrero, Mexico. Scale of B indicated by 
Mexican peso. 
ey 
