Southwestern peninsular ranges in San Diego and into Baja, California [1,2].
Ten occurrences on Conserved Lands in Mu3 (Marron Valley Mitigation Bank, Otay Ranch Preserve, Otay Lake Cornerstone Lands, Otay Mountain Wilderness Area, Otay Mountain Ecological Reserve, BLM, Marron Valley).
Grows among boulders, stones, and in cracks of the bedrock of intermittent streams in rocky gorges surrounded by coastal sage scrub and chaparral . Elevation range is 10-660 meters. Associated riparian species include Baccharis salicifolia, Bothriochloa barbinodis, Brodiaea orcuttii, Cupressus forbesii, Iva hayesiana, Juncus acutus ssp. leopoldii, Mimulus guttatus, Muhlenbergia rigens, and Stemodia durantifolia.
Lamiaceae family . Previously classified as Monardella linoides ssp. viminea, but that subspecies classification was split into Monardella stoneana and Monardella viminea .
M. stoneana often grows together in clumps of 1 to 4 individual plants .
Bloom period is June-September . Seeds mature in late spring and early summer.
No pollination studies are known to exist for M. stoneana; however, other Monardella taxa are visited by butterfly and bee species .
Increased frequency of fires of all sizes can result in type conversion or invasion of nonnative grasses into chaparral habitats that can choke out shrubs associated with M. stoneana . Megafires can be a particular threat because a single megafire could eliminate a large proportion of individual plants within the extant range of the species. Temporary fire impacts include the death of individual plants; however, it is not considered a threat to the continued existence of the species.
Pollinator movement and availability should be considered when assessing likely population distributions and survival, and habitat needs . Can be easily confused with M. viminea .