Arnaldoa is a genus of flowering plants in the aster family, Asteraceae. It is native to Ecuador and Peru.Ulloa, C. U., et al. (2002). Arnaldoa argentea (Barnadesioideae: Asteraceae), a new species and a new generic record for Ecuador. Novon 12 415-419.Tropicos, Arnaldoa Cabrera
These plants are shrubs with spines located at the attachment point of each leaf to the stem. The flower heads contain disc florets in shades of orange, orange-red, purple, or cream and the pappus-tufted fruits are adapted for wind dispersal. The plants grow on dry, wooded or shrubby slopes at elevations between 1370 and 3000 metres.
Species Arnaldoa argentea C.Ulloa, P.Jørg. & M.O.Dillon – up to 3.5 meters tall with light orange or cream-colored florets (Ecuador) Arnaldoa coccinosantha (Muschl.) Ferreyra - Peru Arnaldoa macbrideana Ferreyra – purple florets (Peru) Arnaldoa weberbaueri (Muschl.) Ferreyra – bright orange-red or occasionally purple florets up to 5 centimeters long (Peru)
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