Books reviewed in this article:

Population Biology of Plants. By John L. Harper.

Hybridization and the Flora of the British Isles. Ed. by C. A. Stace.

Die Orchideen. By Rudolf Schlechter.

Encyclopedia of Plant Physiology, New Series Vol. 5. Photosynthesis I. Photosynthetic Electron Transport and Photophosphorylation. Edited by A. Trebst and M. Avron.

Introduction to Ecological Biochemistry. By J. B. Harborne.

Plant Growth Regulation. Ed. by P. E. Pilet.

Water in Plants Bibliography. Volume 1-1975. Ed. by J. Pospisilova and J. Solarova.

Seaweeds. A Color-coded, Illustrated Guide to Common Marine Plants of the East Coast of the United States. By C. J. Hillson.