Botanical Sciences and Native Plant Materials Research, Restoration, and Promotion Act This bill requires the Department of the Interior to establish a botanical science research program, hire botanical scientists, and establish a student loan repayment program for botanical scientists. The bill also (1) requires certain federal agencies and states to establish a preference for using locally adapted native plant materials in various federally funded projects and activities, (2) authorizes federal agencies to carry out specified activities related to native plant materials, and (3) establishes a grant program for projects to prevent rare plants species from becoming endangered species and encourage the recovery of endangered plant species.