We disclose a morpho-anatomical study of Asclepias curassavica L. and Asclepias mellodora
St.-Hil., collected in the Province of Santa Fe, Argentina. Whole plants of both species are commercialized
for external and internal use due to its attributed therapeutic properties. For each entity we provide synonyms,
folk names, morphological description, common and uncommon anatomical characteristics of
roots, stems and leaves. These features were analyzed by optical and scanning electron microscopy. Photomicrographs
are included in order to provide adequate differentiation between entities