Russian Botanist's Name?

[goldsmig at cgsvax.claremont.edu]

A recent radio broadcast of "Sound Prints" featured a Russian botanist (?)
who gained international fame for his collection of seeds and whose career
spanned the first half (?) of this century.

Can someone help me with the name of this gentleman and, if possible, the
title of his primary work?  Thank you very much in advance.

George Goldsmith