Detailed Instructions: In this task, you are given a context paragraph, a question based on that and corresponding answer of a question. Your task is to generate supporting fact/knowledge from context paragraph which helps in answering a given question.
Problem: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
Solution:
Maihuenia is a genus of cactus family Cactaceae and the sole genus of the subfamily Maihuenioideae, which is the smallest subfamily of the Cactaceae.