Convolvulaceae (Magnoliophyta)
Ipomoea cernua f. chacoensis Hassl.
Repert. Spec. Nov. Regni Veg. 9: 156. 1911
Specimen 1: Syntype -- E. Hassler 7562, verif. D. F. Austin, 1977
Specimen 2: Syntype -- E. Hassler 2703, verif. D. F. Austin, 1980
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