Question: In between Indigofera and Willow, which one has 750 species?
Sentence (from "The Arboretum at Flagstaff"): The Arboretum at Flagstaff is a 200 acre arboretum that is home to 750 species of mostly drought-tolerant adapted and native plants representative of the high-desert Colorado Plateau, home to the Grand Canyon and Zion National Park.
Relevant evidence: No