Robinson, H. (1997). New species of Aphanactis, Calea, Clibadium, and Tridax (Heliantheae: Asteraceae) from Ecuador and Peru. Phytologia. 82(1): 58-62.
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Robinson, H.
1997
New species of Aphanactis, Calea, Clibadium, and Tridax (Heliantheae: Asteraceae) from Ecuador and Peru