1. Mexican-Central American Area 
71 species ' 
a. Plants whose origins within this area are as yet diffi- 
cult to localize 
Cucurbita mixta 
C. moschata 
Hylocereus undatus 
Phaseolus vulgaris 
_ 8 species 
Theobroma Cacao 
T. angustifolium 
T.. bicolor 
Zea Mays 
b. Northern Mexico and the adjacent United States 
Cucurbita Pepo 
Helianthus annuus 
ce. Central Mexico (w=western Mexico) 
Agave atrovirens 
A, latissima 
A. mapisaga 
Amaranthus leucocarpus 
Annona diversifolia (w?) 
Casimiroa edulis 
Crataegus pubescens 
Dahlia coccinea 
D. pinnata 
Diospyros Ebenaster 
Hyptis suaveolens (w) 
Opuntia amyclaea 
4 species 
Panicum sonorum 
Phaseolus acutjfolius 
24 species 
O. ficus-indica 
O. megacantha 
O. streptacantha 
Pachycereus emarginatus 
Persea americana (Mexican race) 
Physalts ixocarpa 
Polianthes tuberosa 
Prunus serotina subsp. Capult 
Salvia hispanica 
Tagetes erecta 
T. patula 
Tigridia pavonia 
d. Southern Mexico and northern Central America 
(except for Guatemalan highlands). This is doubt- 
less the least well defined and most inclusive of the 
subregions delineated 
here. (y=Yucatan, m= 
southern Mexico, ca=Central America) 27 species 
Agave fourcroydes (y) 
A. sisalana (y) 
Annona purpurea ? 
Brosimum Alicastrum 
Byrsonima crassifolia 
Calocarpum mammosum 
C. viridis (ca) 
Carica Papaya 
Chamaedorea Tepejilote 
C. Wendlandiana 
Cnidosculus Chayamansa (y) 
Crescentia Cujete 
Indigafera suffruticosa 
Jatropha Curcas (m) 
Manilkara (Achras) Zapotilla 
Nopalea cochenillifera (m) 
Pachyrrhizus erosus (m) 
Parmentiera edulis 
Persea Schiedeana 
Pouteria campechiana 
P. hypoglauca 
Protium Copal 
Psidium Sartorianum 
Spondias Mombin (ca) 
S. purpurea 
Vanilla planjfolia (m) 
Yucca elephantipes (m) 
1 Note that races of the avocado, Persea americana, are listed under 
two subregions. 
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