Melica geyeri is a species of grass known by the common name Geyer's oniongrass. It is native to Oregon and California, including the Sierra Nevada. It grows in many types of habitat, including mountain forests and open hillsides. It is native to Oregon and California, including the Sierra Nevada. It grows in many types of habitat, including mountain forests and open hillsides. Melica geyeri is a rhizomatous perennial grass growing up to 2 meters in maximum height. The base of the stem swells into onionlike corms. The inflorescence is a wide array of long, narrow, pointed spikelets which are green with purple banding.