18 
Section 9. CHELONOCARPUS Safford.? 
CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Type species, Annona scleroderma Safford, the hard-shelled custard apple of 
Guatemala (fig. 22). 
In this section the inflorescence is usually caulifloral, several flowers issuing 
in a fascicle or on a very short specialized branchlet from the bark of the old 
Fic. 23.—(a) Stamens 
and (b) carpe! of 
Annona scleroderma, 
Scale 12. 
stems or branches, somewhat as in 
the genus Raimondia, but all of them 
perfect instead of unisexual and with 
the connective broadly expanded and 
truncate at the apex above the pollen 
sacs (fig. 23, @) and the carpels 
closely appressed to form a compact 
gynecium (fig. 24). The ovaries are 
clothed with appressed hairs and the 
styles are ovate and constricted at the 
base (fig. 23, 6). The corolla resem- 
bles that of the section Atta, with 
three oblong or linear petals exca- 
vated at the base to receive the essential parts; or if inner 
petals are present these are very minute and inconspic- 
nous. 
The fruit is spherical or subglobose with a hard shell 
having the surface divided into polygonal areoles by ob- 
Fic, 25.—Annona reticulata, the common 
custard apple. 
tuse raised ridges. 
The seeds are com- 
paratively large, 
compressed, and 
smoothly _ polished. 
The name of the 
section is suggested 
by the resemblance 
shell. 
and acuminate, 
nerves not prominent. 
Besides the type, 
(fig. 1, p. 2). 
mercial 
buds are in most of 
pyriform. 
Scale 3. parently 
3-petaled, 
Fia. 24,—Flower of 
Annona pittieri. 
Petals removed. 
Scale 4. 
of the shell of the fruit to tortoise 
The leaves are coriaceous, oblong 
with the secondary 
this section in- 
cludes Annona testudinea Safford and 
A. pittieri Donn. Smith. 
Section 10. ATTA Mart, 
Type species, Annona squamosa L., 
the sugar apple or ‘“ pomme-cannelle” 
This group includes most of the com- 
custard apples. 
The flower 
the species long 
and slender, but sometimes oblong or 
The corolla (fig. 26) is ap- 
but there are 
usually 3 inner petals present, often no longer than a stamen, with a texture 
similar to that of the connective of the stamens and usually with a longitudinal 
* Journ. Washington Acad. Sci. 3: 103. 1913. 
