Oro Lake Regional Park
Note the ovules are borne on the walls of the non-sectioned ovary (parietal placentation).
Mamillaria/Coryphantha: Note that Budd's Flora places this species in genus Mamillaria, while Flora of Alberta places it in genus Coryphantha. The following are the answers to the key questions in these flora that lead to Mamillaria or Coryphantha.
Cactaceae: Answers to key questions in Budd's Flora leading to this family.