This study aimed to determine if grass phytolith shapes and abundances can distinguish between grass taxa. Researchers: 1. Collected and prepared phytolith slides from 14 grass species at the UW herbarium, focusing on bilobate phytoliths. 2. Counted phytolith morphotypes for each species and found bilobates more common in subfamily Arundinoideae than Chloridoideae. 3. Used geometric morphometrics of bilobate phytolith shapes, finding it separated species and clades in morphospace. Preliminary results suggest phytolith traits can distinguish grass taxa and provide past climate information.