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Daghlían, C. P. & D. L. Dilcher. 1971.Philodendron leaves from Eocene sediments in Tennessee. Ind. Acad. Sci.80: 95–96 (abstract).

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Dolph, G. E. 1972. A review of the fossil Apocynaceae from the Eocene of western Tennessee and Kentucky. Indiana Acad. Sci. Proc.81: 93 (abstract).

—. 1973. An analysis of population variability inApocynophyllum mississippiensis. Amer. Jour. Bot.60(4, sup.): 16 (abstract).

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—. 1950a. Morphology and venation of the leaf inQuiina acutan-gula Ducke. Amer. Jour. Bot.37: 159–171

—. 1950b. Venation and histology of leaflets inTouroulia guianen-sis Aubl. andForesia tricarpa Pires. Amer. Jour. Bot.37: 848–862

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Hofmann, E. 1932. Epidermisreste und Blattabdrücke aus den Braunkohlen-lagern ded Geiseltales. Nov. Act. Leopold, Neue Folge1: 59–74.

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