Darwin-Hooker Letters : Letter from J. D. Hooker to C. R. Darwin [9 March 1859]
Hooker, Joseph Dalton
Darwin-Hooker Letters
<p style='text-align: justify;'>Outlines the basic categories of phanerogams.</p><p style='text-align: justify;'>Places Gymnospermae in the dicotyledons.</p><p style='text-align: justify;'>Evaluates the variable utility of embryological characters in plant classification.</p>