This essay aims to reappraise Agnes Arber's contribution to the history of science with reference to her work in the history of botany and biology. Both her first and her last books (Herbals, 1912; The Mind and the Eye, 1954) are classics: the former in the history of botany, the latter in that of biology. As such, they are still cited today, albeit with increasing criticism. Her very last book was rejected by Cambridge University Press because it did not meet the publisher's academic standards – we shall return to it in due course. Despite Kathryn Packer's two essays about Arber's life in context, much remains to be done toward a just appreciation of her research. We need such a reappraisal in order to avoid anachronistic criticisms of her contributions to the historiography of botany, or, on the other hand, uncritical applause for her studies in plant morphology.