San Diego Management & Monitoring Program


Jennifer's monardella
Monardella stoneana


Kingdom Phylum Subphylum Class Order Suborder Family

Current distribution rangewide

Southwestern peninsular ranges in San Diego and into Baja, California [1,2].


Known Populations in San Diego County

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).


List status

None [2].


Habitat affinities

Grows among boulders, stones, and in cracks of the bedrock of intermittent streams in rocky gorges surrounded by coastal sage scrub and chaparral [3]. 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.


Taxonomy and genetics

Lamiaceae family [2]. Previously classified as Monardella linoides ssp. viminea, but that subspecies classification was split into Monardella stoneana and Monardella viminea [4].


Life history demography

M. stoneana often grows together in clumps of 1 to 4 individual plants [4].


Seasonal phenology

Bloom period is June-September [2]. Seeds mature in late spring and early summer.


Pollination seed dispersal

No pollination studies are known to exist for M. stoneana; however, other Monardella taxa are visited by butterfly and bee species [3].


Threats

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 [4]. 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.


Special considerations:

Pollinator movement and availability should be considered when assessing likely population distributions and survival, and habitat needs [1]. Can be easily confused with M. viminea [2].


Jennifer's monardella sources