The scientific names of three wildflowers in the same family are: Calochortus simulans, Calochortus clavatus, and Fritillaria biflora. Which of these flowers would you expect to be the most similar?

The scientific names of three wildflowers in the same family are: Calochortus simulans, Calochortus clavatus, and Fritillaria biflora. Which of these flowers would you expect to be the most similar?