Cinchona calisaya var. ledgeriana, 1869Cinchona calisaya var. ledgeriana, from The Quinology of the East Indian Plantations by John Eliot Howard, illustrated by William Fitch, 1869
Cinchona anglica, 1869Cinchona anglica, a hybrid form that evolved in the Indian plantations. From The Quinology of the East Plantations by John Eliot Howard, illustrated by William Fitch, 1869
Cinchona calisaya var. ledgeriana, 1862Illustration from Nueva Quinologia of Pavon by John Eliot Howard, 1862
Cinchona officinalis, 1869Cinchona officinalis, from The Quinology of the East Indian Plantations by John Eliot Howard, illustrated by William Fitch, 1869
Cinchona calisaya, 1862Cinchona calisaya (formerly C. peruviana), from Illustrations of the Nueva Quinologia of Pavon by John Eliot Howard, illustrated by William Fitch, 1862
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