San Bernardino County Website | Home   
San Bernardino County Museum Header Image
San Bernardino County Museum Logo

Alluvial fan sage scrub is a sub-type of coastal sage scrub found on the alluvial fans and flood plains of the coastal side of the San Bernardino and San Gabriel Mountains. All remaining significant expanses of alluvial fan sage scrub habitats now occur only in San Bernardino County, specifically on the Etiwanda Fan, Lytle Creek, Cajon Creek and the Santa Ana River. The climatic features of alluvial fan sage scrub are similar to those for Coastal Sage Scrub, but differ in the frequency and intensity of surface flooding that occurs within the habitat. The soil is a complex, unsorted structure of alluvium composed of boulders, rocks and sands. The vegetation is less dense than that of coastal sage scrub when it occurs in river channels where it is subject to frequent flooding. The primary indicator plant for alluvial fan sage scrub is Scale-broom (Lepidospartum squamatum). Alluvial Fan Sage Scrub Communities have been severely altered by flood control activities that circumvent the periodic flooding necessary to maintain the habitat, leading to the gradual type conversion of this unique community type. The State of California considers Alluvial Fan Sage Scrub to be a very threatened and rare natural community.



Plant Communities of the Etiwanda Fan
Amphibians and Reptiles of the Etiwanda Fan
Birds of the Etiwanda Fan
Mammals of the Etiwanda Fan

San Bernardino County Museum - (909) 307-2669 - 2024 Orange Tree Lane, Redlands, California 92374

© 2005 San Bernardino County Museum
The information contained in the following pages was valid at the time of publication. The County of San Bernardino, Museum Department reserves the right to make changes and improvements at any time and without notice, and assumes no liability for damages incurred directly or indirectly as a result of errors, omissions or discrepancies. Please contact the webmaster with comments or suggestions.