Question: Which one, Purshia or Maihuenia, is a small genus of 5-8 species of flowering plants in the family Rosaceae?
Sentence (from "Maihuenia"): Maihuenia is a genus of cactus (family Cactaceae) and the sole genus of the subfamily Maihuenioideae, which is the smallest subfamily of the Cactaceae.
Relevant evidence: Yes