Pontederia cordata
Illustration by Mary Vaux Walcott. North American Wild Flowers. Washington, 1925.
Cypripedium acaule
Illustration by Mary Vaux Walcott. North American Wild Flowers. Washington, 1925.
Pentstemon erianthera
Illustration by Mary Vaux Walcott. North American Wild Flowers. Washington, 1925.
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