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Figure 1: Diagrams of the four cultivated varieties of chaya. I. ‘Estrella’ II. ‘Picuda’ III. ‘Chawamansa’ iV. ‘Redonda.’ Diagrams by Dr. Alvaro Molica-Cruz. Reprinted by permission from Economic Botany, 56(4): 350-365, Jeffrey Ross-Ibarra and Alvaro Molina-Cruz, Copyright 2002, The New York Botanical Garden, Bronx, New York.