The refuge was formed in 1980 to prevent extinction of this plant, as well as Lange's metalmark butterfly (Apodemia mormo langei) and the Contra Costa wallflower (Erysium capitatum var. angustatum).
Oenothera | ''Rhagodia preissii'' subsp. ''obovata'' | Œnothera | Muehlenbeckia horrida subsp. abdita | ''Eremophila denticulata'' subsp. ''denticulata'' | ''Anigozanthos bicolor'' subsp. ''minor'' | Acer pictum subsp. mono | ''U. m.'' subsp. ''angustifolia'' | ''Tabebuia chrysantha'' subsp. ''meridionalis'' | ''Synurus deltoides'' (AIT.) NAKAI | Populus deltoides | Plebidonax deltoides | Olea europaea subsp. cuspidata | Oenothera pubescens | Oenothera californica | ''Mycoplasma capricolum subsp. capricolum'' | ''Muehlenbeckia horrida'' subsp. ''abdita'' | ''M. mycoides'' subsp. ''mycoides'' | ''M. mycoides'' subsp. ''capri'' | ''M. capricolum ''subsp. ''capripneumoniae'' | Lactobacillus delbrueckii subsp. bulgaricus | ''Juniperus communis'' subsp. ''alpina'', in Vitosha | Banksia integrifolia subsp. integrifolia | ''Banksia integrifolia'' subsp. ''integrifolia'' | ''Arisaema thunbergii'' subsp. ''urashima'' on Mt. Ryozen (Suzuka Mountains | ''A. obovatum'' subsp. ''lanceolatum'' |