He married Elizabeth Gertrude Knight, a bryologist, on August 27, 1885.
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He wrote Illustrated Flora of the Northern United States, Canada, and the British Possessions (1896) with Addison Brown, and The Cactaceae with Joseph Nelson Rose.
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farwellii was published in An Illustrated Flora of the Northern United States (Britton & Brown), 1: 334.
After Baker left Cuba, León corresponded extensively with Nathaniel Lord Britton at the New York Botanical Garden, grass specialists A. S. Hitchcock and Mary Agnes Chase at the United States Department of Agriculture, and fern specialist William Ralph Maxon at the United States National Museum.