$modus 0:
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Asclepias engelmanniana
Asclepias engelmanniana Woodson [Accepted]
Asclepiadaceae Asclepioideae Asclepiadeae
6 96332 Asclepias engelmanniana Woodson
W.A. Bell, M.B. Cantab, New Tracks N. Amer., vol. 1 : t. 1 (1869) [W.G. Smith]