A.B., Univ. of Wisconsin 1917; A.M. 1920 ; Ph.D. 1922;
England, UK
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ass.prof. of botany, Univ. of Missouri 1922-24, assoc.prof. 1924-39, ass.bibliogr., New York Botanic Garden 1939-42, Bibliogr.1942-63; curator 1961-