There are several rare, threatened plant species in the area, including the Ben Lomond wallflower (Erysimum teretifolium), the Ben Lomond spineflower (Chorizanthe pungens ssp. hartwegiana), and the Santa Cruz cypress (Callitropsis abramsiana).
Cupressus macrocarpa | Cupressus sempervirens | Cupressus | Cupressus abramsiana | ''Cupressus forbesii'' - Tecate Cypress bark,
at Guatay Mountain, Cuyamaca Mountains | Cupressus chengiana |