SAFFORD—CLASSIFICATION OF ANNONA. 11 
KEY TO THE SECTIONS. 
Corolla gamopetalous, 6-lobed_____----------__---- 6. GAMOPETALUM (p. 18). 
Corolla polypetalous. , 
Petals normally 3, broadly ovate or suborbicu- 
lar, concave; inner petals when present 
more or less imperfect_______-_-------_-- 5. PILANNONA (p. 12). 
Petals normally 6, the outer ones broadly ovate 
or suborbicular, the inner ones oblong or 
linear __________-_--------------------- 4, HELocEentIA (p. 11). 
Section 4. HELOGENIA sect. nov. 
Type species, Annona paludosa Aubl. (pl. 17; fig. 14). 
This appears to be intermediate between the Guanabani and the Pilaeflorae 
and may be regarded as a link connecting the two groups. From the former 
Fig. 13.—Frult of Annona rodriguesii. After Rodrigues. Scale 3. 
it differs in having the narrow, lanceolate or linear inner petals of the present 
group. From Pilannona it differs in having the corolla normally 6-petaled 
instead of 3-petaled. The texture of the leaves (pl. 17) suggests affinities 
with both Annona purpurea (section Ulocarpus) and A. jenmanii (section 
Pilannona), and that it is really allied to these two sections is indicated by 
the character of the stamens and carpels, as well as by the muricate fruit. 
The name Helogenia is suggested by the habitat of the type species, which 
grows in swamps, Other species included in the section are perhaps xero- 
