Physalis ixocarpa Brot.: Tématl, miltématl, tomate, 
tomatillo, husk tomato. 
This is an important plant in the central Mexican high- 
lands where the fruits are used in stews and sauces. The 
fruits are quite large and the plants highly variable. In 
some areas two varieties are recognized, at least in the 
markets; one with the husk close-fitting about the fruit 
and the other with a larger husk. ‘These seem to be the 
two forms illustrated by Rose (164). The species is prob- 
ably native to central Mexico. The cultivated Physalis 
of the Guatemalan highlands is usually referred to P. 
pubescens 1.., but may be P. ixocarpa or some other spe- 
cies. P. peruviana L., of South America, is not closely 
related. (115, 137*, 149, 164, 167, 193) 
Polianthes tuberosa L.: Nardo, tuberose. 
The tuberose, a widely cultivated ornamental, is not 
definitely known as a wild plant, but it is almost certainly 
a native of Mexico, as are the other species of the genus. 
Double forms are frequent, and the plant probably has a 
long history of cultivation. (14, 165*, 194*) 
Pouteria campechiana (H BAK.) Baehni (Lucuma 
saleifola HBK.): Costiczdpotl, yellow sapote. 
This fruit tree ranges from southern Mexico to Pan- 
ama, but is cultivated principally in Mexico according to 
Popenoe. 
P. hypoglauca (Standl.) Baehni, a similar species, is 
cultivated and perhaps native from San Luis Potosi and 
Veracruz to northern Central America. (64*, 1538*, 191, 
199) 
Protium Copal (Schlecht. & Cham.) Engler: Copal, 
pom. 
This tree was important among the ancient Maya for 
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