Note 128 — Chapter XV
Reading edition
Some orchid is in flower all the year round. The finest species is the odontoglossum, having long, chocolate-colored petals, margined with yellow. "Such is their number and variety (wrote Humboldt) that the entire life of a painter would be too short to delineate all the magnificent Orchideæ which adorn the recesses of the deep valleys of the Peruvian Andes." For many curious facts respecting the structure of these flowers, see Darwin's Fertilization of Orchids.