The physiology of flowering plants: their growth and development / by H. E. Street and Helgi Öpik. Street, H. E. (Herbert Edward) Öpik, Helgi, 1936- joint author. Plant physiology. QK711.2 .S78 1970b 582.13 STP Includes bibliographical references and Index. London : Edward Arnold, c1970. c1970. 1970 Text viii, 263 p. : eng Contemporary biology