United States, California, Monterey, Fort Hunter Liggett (Cantonment) near road to campground, ca. 0.8 km W of Jolon Creek, ca. 0.8-1.0 km N of San Antonio River. UTMs: Zone 10S, 663800 to 664000 E, 3981200 to 3981400 N.
290 meters (951ft)
Flood-sand and gravel over clay. Associates: Eryngium vaseyi, Plagiobothrys spp., Pilularia americana, Pogogyne serpylloides, Navarretia prostrata, Psilocarphus spp., Epilobium spp., Crassula spp., Rumex crispus, Castilleja densiflora, Lythrum hyssopifolia. Common. Annual. Fibrous-rooted. Erect to standing, to 4 dm tall.