14 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
when ripe, with the component carpels tuberculate and often terminating in a 
point. The seeds are short and broad with conspicuous caruncles, very much 
like those of the African A. senegalensis. 
Group III. Acutiriorar (SHARP-PETALED ANNONAS). 
(Section Acutiflorae Mart. in part.) 
Petals 6, ovate or lanceolate, both outer and inner petals valvate, acute. 
KEY TO THE SECTIONS. 
Flower buds depressed conoid or pyramidal; leaves 
subcoriaceous, glossy laurel-like..-..--____-. 7. PHELLOXYLON (p. 14). 
Flower buds more or less fusiform or conoid- 
acuminate; leaves membranaceous___---_-_-- 8. ATRACTANTHUS (p. 15). 
Section 7. PHELLOXYLON sect. nov. 
Type species, Annona glabra L. (pl. 4; figs. 18-20). 
In this section the corolla bears a superficial resemblance to that of Euan- 
nona, but the inner petals are acute and valvate (fig. 19) and the venation 
of the coriaceous, glossy, laurel-like leaves is quite distinct, conspicuously 
reticulate when dry and _ lacking 
the minute axillary pockets. of 
Annona muricata and its allies. 
The chief peculiarity of this sec- 
tion, however, is the form of its 
gynecium (fig. 20), which has the 
ovaries closely cemented together 
even in the flower. The wood, espe- 
cially that of the roots, is very light 
and corklike and is used for floats of 
fishing nets and for stoppers of bot- 
tles. Itis commonly known as “ cork- 
wood ” and this name has suggested 
that which is here proposed for the 
section. The fruit (pl. 4) is smooth 
and apple-like in appearance, with 
the areoles only faintly indicated on 
the surface. 
This section is typified by a spe- 
cies, which was described by Lin- 
nus under two distinct botanical 
names: First, as Annona glabra, in 
the first edition of his Species Plan- 
tarum (1753), his description being 
based on Catesby’s figure of a plant 
growing in the Bahama Islands; 
iat of Annona glabra, from afterwards, as Annona palustris, in 
see er the New York Botesteal Gar, tHe Second edition of his Species 
den. Scale 3. Plantarum (1762), his description 
being based on Sir Hans Sloane's 
account of specimens of the Jamaican “water apple” growing “at and above 
the bridge over the Black-River in St. Dorothy’s.” Fortunately the localities in 
which the type plants of both descriptions grew are definitely fixed and many 
specimens from both localities are to be found in herbaria, especially in the 
Herbarium of the New York Botanical Garden. Those of each locality show 
EXPLANATION OF PLATE 4.—Fruit and flower bud, photographed in Venezuela by H. Pit- 
tier. Natural size. 
