104 safford: chelonocarpus 



us) hemispherical or conoid, not clothed with hairs or bristles 

 but with minute scale-like processes subtending the bases of the 

 filaments in more or less vertical rows; corolla 3-petaled, the 

 petals valvate, oblong or linear-oblong, the upper part trique- 

 trous or keeled within, the lower part concave and swollen so 

 as to include the essential parts; stamens with stout iilaments 

 bearing upon their back a pair of linear pollen sacs and termin- 

 ating in an expanded minutely verrucose connective above them; 

 carpels cohering firmly to form a solid gynoecium, with the outer 

 ovaries minutely hirsute and the styles sharply articulated at 

 the base and falling off soon after pollination has been effected; 

 fruit (syncarpium) spheroid or conoid, composed of firmly con- 

 solidated one-seeded carpels inclosed in a thick rigid shell with 

 the surface divided into rhomoboid or polygonal areoles by raised 

 ridges; seeds smooth and glossy, oblong, somewhat compressed 

 but not marginate, brown, or grayish brown to mouse-colored, 

 surrounded by juicy pulp; leaves coriaceous, oblong, acuminate, 

 with the midrib impressed above and raised beneath and the 

 lateral nerves anastomosing before reaching the margin and con- 

 nected by inconspicuous reticulating veins. 

 • The species belonging to this section have been confused with 

 the common custard-apple or bullock's heart {A. reticulata L.) 

 and the chirimoya (A. cherimola Miller) from both of which they 

 are easily distinguished by the large glossy seeds and the smooth, 

 flat, coriaceous oblong leaves, as well as by the coherent nature 

 of the gynoecium and the thickness of the rigid shell of the 

 fruit. The two species here described may be broadly distin- 

 guished as follows: 



Fruit ■ oblate-spheroid in form, umbilicate; leaves not 

 exceeding 9 inches (23 cm.) in length, abruptly acu- 

 minate Anno7ia scleroderma 



Fruit globose in form, not umbilicate; leaves some- 

 times 1 foot (30 cm.) long, gradually acuminate 



Annona testudinea 

 In addition to these species it is probable that A. Pittieri 

 Donnell Smith, from southern Costa Rica, should be assigned to 

 this section, as the character of its leaves and flowers would in- 



