While there are important differences among seedling cheri-moyas, affecting not only the productiveness and foliage of the tree but also the size, form, character of surface, color, quality, and number of seeds of the fruit, few named varieties have as yet been propagated. In the Pomona College Journal of Economic Botany (May, 1912) the author has described two, viz., Mammillaris and Golden Russet, which have been propagated in California on a limited scale. Neither of these, however, merits extensive cultivation; hence the descriptions will not be included in this work. It seems desirable, however, to repeat the botanical classification of seedling cherimoyas published by W. E. Safford in the Standard Cyclopedia of Horticulture. This comprises the following five forms :
Finger-printed (botanically known as forma impressa).- Called in Costa Rica anona de dedos pintados. The fruit is conoid or subglobose in shape, and has a smooth surface covered with U-shaped areoles resembling finger-prints in wax. Many seedlings of this type are of good quality, and contain few seeds.
Smooth (forma Ioevis).- Called chirimoya lisa in South America and anon in Mexico City. This form is often mistaken for Annona glabra and A. reticulata because of the general appearance of the fruit and on account of the name anon, which is also applied to A. reticulata. One of the finest types of cherimoya.
Fig. 24. Seedling cherimoyas, showing some of the common types. (X 1/5)
Tuberculate (forma tuberculata). - One of the commonest forms. The fruit is heart-shaped and has wart-like tubercles near the apex of each areole. The Golden Russet variety belongs to this group.
Mammillate (forma mamillata). - Called in South America chirimoya de tetillas. Said to be common in the Nilgiri hills in southern India, and to be one of the best forms grown in Madeira.
Umbonate (forma umbonata). - Called chirimoya de puas and anona picuda in Latin America. The skin is thick, the pulp more acid than in other forms, and the seeds more numerous. The fruit is oblong-conical, with the base somewhat umbilicate and the surface studded with protuberances, each of which corresponds to a component carpel.
Hybrids between the cherimoya and the sugar-apple (Annona squamosa) have been produced in Florida by P. J. Wester and Edward Simmonds. The aim has been to develop a fruit having the delicious flavor of the cherimoya, yet adapted to strictly tropical conditions. Some of the hybrids have proved to be very good fruits, and further work along this line is greatly to be desired. Wester calls this new fruit atemoya. Hybrids between it and the sugar-apple, the bullock's-heart, and the pond-apple (all of which see below) have been obtained by him in the Philippines.
Plate IX. Upper, the home of the Fardh date; lower, in the date gardens of Basrah.