Ellenberg, H., Esser, K., Merxmüller, H., Schnepf, E. & Ziegler, H. (eds.), Progress in Botany. Morphology, Physiology, Genetics, Taxonomy, Geobotany. — Fortschritte der Botanik. Morphologie, Physiologie, Genetik, Systematik, Geobotanik. Vol. 37. 20 figs., 1 table, XVII + 402 p. (94 p. in German). Springer-Verlag. Berlin, Heidelberg, New York, 1975. ISBN 3–540–07504–6. Cloth DM 120,—; US $ 49,20