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Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 1906)

Just's Botanischer Jahresbericht - Just, Johann Leopold, 1841 -1891 (Gebruder Borntraeger, 1911)

Madroño; a West American journal of botany - California Botanical Society. (California Botanical Society, 1974)

North American flora - New York Botanical Garden (New York Botanical Garden, 1911)