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Apocynaceae
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Asclepias
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Asclepias tuberosa
Asclepias tuberosa
R. W. Smith
B. S. Walters
B. S. Walters
M. Demmon
D. Drife
ex W. H. Wagner slide collection
flower, top view
Ann Arbor Natural Area Preservation
fruits opening
Ann Arbor Natural Area Preservation
B. S. Walters
with A. syriaca
B. S. Walters
inflorescence
A. A. Reznicek
fruits and seeds
C. Peirce
J. Kelly
seed pod