Emory's and Broom baccharis scrub
USDA Ecological Section Map
- Primary Life FormShrub
- Elevation100-1800 m
- State RarityS3
- Global RarityG4
- DistributionUSA: AZ, CA, NM, NV, TX?, UT (NatureServe)
- Endemic to CaliforniaNo
- Endemic to California Floristic Province and DesertsNo
- Date Added2016/11/21
- Baccharis sergiloides > 3% absolute cover in the shrub canopy, and > 50% relative cover in the overstory as the dominant shrub (Evens 2000, Thomas et al. 2004).
- Baccharis sergiloides or Baccharis emoryi > 30% relative cover in the shrub canopy (Evens et al. 2014).
- Baccharis emoryi > 3% absolute cover in the shrub canopy, and exceeds any other shrub in cover (Keeler-Wolf et al. 1998b).
Other Habitat, Alliance and Community Groupings
|MCV (1995)||Not treated|
|NVCS (2009)||Baccharis emoryi seasonally flooded shrubland alliance, Baccharis sergiloides intermittently flooded shrubland alliance|
|Calveg||Cheesebush (Burrobush), Baccharis (riparian)|
|Holland||Mulefat scrub, Mojave desert wash scrub|
|Munz||Creosote bush, Joshua tree woodland, Pinyon-juniper woodland|
|CDFW CA Code||63.550.00|
National Vegetation Classification Hierarchy
|Formation Class||Mesomorphic Tree Vegetation (Forest and Woodland)|
|Formation Subclass||Temperate Forest|
|Formation||Temperate Flooded and Swamp Forest|
|Division||Western North America Warm Temperate Flooded and Swamp Forest|
|Macro Group||Southwestern North American Riparian, Flooded and Swamp Forest|
|Group||Southwestern North American riparian/wash scrub|
Baccharis sergiloides is a short-lived shrub that requires relatively high subsurface moisture. Environmental conditions overlap those of Salix exigua. Little literature exists on its ecology. As with B. pilularis, it sprouts following disturbance and does not attain great age. Shrubs produce abundant, wind-dispersed seeds with substantial pappus bristles.
The alliance occurs as open stands to dense thickets. Stands are typically small and occupy intermittently to seasonally flooded stretches of desert canyon bottoms and streams, or borders of springs and seeps. Boulders and bedrock often break up the stands although the rooting substrate is typically relatively fine to gravelly sand (Evens 2000). The two indicator species of the alliance were previously viewed as separate alliances in the 2009 version of this classification, but more recently have been combined because of overlapping characteristics. More sampling is needed, though, to determine association level variation of Baccharis emoryi stands.
Life History Traits of the Principal Species
|Baccharis emoryi||Baccharis sergiloides|
|Life forms||Shrub; evergreen||Shrub|
|Mode of dispersal||Wind||Wind|
|Germination agents||None||Inundation (high moisture)|
|Mode of sprouting||null||Buds on large branches or trunks (above-ground branches)|
|Survivability after fire/disturbance||Fire-sensitive; high sprouter||Fire-sensitive; high sprouter|
|Reproductive range||3-50? years||5?-70? years|
|Regional variation||null||Mojave Desert|
|Fire return interval||—|
The range of Baccharis sergiloides includes the Colorado Desert (322C), the eastern lower slopes of the Sierra Nevada (M261Es), and the Sonoran Desert (322B). Also, the range of Baccharis emoryi is wider across southern California than is currently noted for the alliance, including the Sonoran Desert. More sampling is needed to determine full range of the alliance.
- Colorado Desert (322Cb). Stands of Baccharis emoryi have been mapped rarely in the region, including along Fish Creek Wash in Anza-Borrego Desert State Park (Keeler-Wolf et al. 1998b).
- Mojave Desert (322Aa-d, Af, Ah-j, Al, An, Ap). Stands of Baccharis sergiloides are common in moist canyon bottoms, seeps, and springs especially in the mountains of the eastern subsections (Evens 2000, Thomas et al. 2004). The alliance is scattered throughout the Mojave National Preserve in the Granite, Providence and New York Mountains, and in Death Valley National Park in the Valley and Funeral Mountains (Evens et al. 2014). In addition, observations of small stands of B. emoryi include the northern and central Mojave Desert. The alliance occurs more sporadically in the western subsections.
- Southeastern Great Basin (341Fb-f). Stands of Baccharis sergiloides occur in the Coso, Inyo, Panamint, and Grapevine Mountains (Thomas et al. 2004, Evens et al. 2014). Additionally, stands of Baccharis emoryi have been observed in the Argus and Panamint Ranges.
- Southern California Mountains and Valleys (M262Bi, Bk, Bp). Stands are found in moist canyon bottoms, seeps, and springs in the desert-facing subsections with Baccharis emoryi (Keeler-Wolf et al. 1998). Closer to the coast the similar Baccharis sarothroides occupies intermittent stream channels. Stands of B. emoryi are also found near Lake Matthews in western Riverside Co. (Klein and Evens 2005).
- Baccharis emoryi , , 
- Baccharis sergiloides , 
- Baccharis sergiloides / (Muhlenbergia rigens - Typha domingensis) , , 
- Baccharis sergiloides - Prunus fasciculata - Rhus trilobata , , , , 
-  Evens, J.M. 2000
-  Keeler-Wolf, T.;Thomas, K. 2000
-  Keeler-Wolf, T.;Roye, C.;Lewis, K. 1998b
-  Keeler-Wolf, T. 2007b
-  Evens, J.M.;Sikes, K.;Hastings, D.;Ratchford,J.S. 2014
-  Klein, A.;Evens, J. 2005
-  Menke, J.;Hepburn, A.;Johnson, D.;Reyes, E.;Evens, J.;Sikes, K.;Winitsky, S. 2019 (In Progress)
- Beatley, J.C. 1976
- Hightower, S. 2016
- Keil, D. J. 1993
- Menke, J.;Reyes, E.;Hepburn, A.;Johnson, D.;Reyes, J. 2013
- NPS (National Park Service), 2005
- Shanfield, A.N. 1984 1984
- Thomas, K.;Franklin, J.;Keeler-Wolf, T.;Stine, P. 2004
- VegCAMP (Vegetation Classification and Mapping Program),;AIS, 2013