Cylindropuntia whipplei
Illustration by Mary Vaux Walcott. North American Wild Flowers. Washington, 1925.
Gentiana saponaria
Illustration by Mary Vaux Walcott. North American Wild Flowers. Washington, 1925.
Gentiana clausa
Illustration by Mary Vaux Walcott. North American Wild Flowers. Washington, 1925.
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