Asclepias speciosa
Illustration by Mary Vaux Walcott. North American Wild Flowers. Washington, 1925.
Le sablier elastique. Hura crepitans
Illustrations of Himalayan plants. W. H. Fitch. London, 1855
Arnica louisiana
Illustration by Mary Vaux Walcott. North American Wild Flowers. Washington, 1925.
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