Task: Explanation
Input (English): Maihuenia is a genus of cactus (family Cactaceae) and the sole genus of the subfamily Maihuenioideae, which is the smallest subfamily of the Cactaceae. The genus comprises two cushion-forming, mucilaginous species. They are found at high elevation habitats of Andean Argentina and Chile. Question: Which one, Purshia or Maihuenia, is a small genus of 5-8 species of flowering plants in the family Rosaceae? Answer: Purshia
Output (English): Maihuenia is a genus of cactus family Cactaceae and the sole genus of the subfamily Maihuenioideae, which is the smallest subfamily of the Cactaceae.