San Diego Management & Monitoring Program

Parry's tetracoccus
Tetracoccus dioicus

Kingdom Phylum Subphylum Class Order Suborder Family

Current distribution rangewide

Coastal southern California from Peninsular Range foothills of Orange, Riverside, and San Diego Counties to Baja California, Mexico [1,2].

Known Populations in San Diego County

Eight occurrences on Conserved lands in MUs 3 (South Crest, McGinty Mountain, Sycuan Peak Ecological Reserve), 6 (San Marcos Mountains) and 8 (Merriam Mountains, Monserate Mountain, Wilderness Gardens).

List status

None [2].

Habitat affinities

Occurs on dry, stony slopes composed of gabbro-derived soils in chaparral and coastal scrub communities[3; cited from 4]. Elevation range is 165-1,000 meters [2]. Low-growing chamise chaparral, with moderately dense canopy cover [5].

Taxonomy and genetics

Picrodendraceae family [2].

Life history demography

Perennial deciduous shrub [2].

Seasonal phenology

Blooms April to May [2].


Threatened by agriculture and development [2].

Parry's tetracoccus sources