50542
These vary from small " bumps " to prominent , nipple-like shapes in the genus " Mammillaria " and outgrowths almost like leaves in " Ariocarpus " species .
 Mammillaria, Ariocarpus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Mammillaria, Ariocarpus