robusta hartwegii occurs is inhabited also by three other endangered species: Polygonum hickmanii (Scotts Valley polygonum, USFWS 2003), Plagiobothrys
diffusus (San Francisco popcorn flower, California Department of Fish and Wildlife 2013), and Cicindela ohlone (Ohlone tiger beetle, USFWS 2001).
hartwegii (USFWS 1994), San Francisco popcorn flower Plagiobothrys
diffusus (California Department of Fish and Game 2012), and Ohlone tiger beetle Cicindela ohlone (USFWS 2001).
2005) and in association with low-growing annual plants, including: natives--rusty popcornflower Plagiobothrys
nothofulvus, miniature lupine Lupinus bicolor and California goldfields Lasthenia californica; and invasives--soft brome Bromus hordeaceus and stork's bill Erodium sp.