California: Malosma laurina.
This paper describes the first collections of Malosma laurina to be reported from the San Bernardino Mts., California, USA. The two collection localities are 65 km apart, resulting in range extensions of 18 km NE in San Bernardino Co., and 58 km E in Riverside Co. At Badger Hill Preserve, the single individual of M. laurina is an arborescent shrub growing on a SE aspect backslope of 40° angle. At Whitewater Preserve, a small population of shrubs was clustered at the base of an east canyon wall drainage, on a W aspect footslope of 158, uphill from 'Trout Pond' where groundwater seepage occurs along a fault line mapped in the San Andreas-Banning zone. It is possible that M. laurina was introduced at this locality because non-native Robinia pseudoacacia is naturalized at the historical site of a fish hatchery nearby in the Preserve. However, the population of M. laurina is well established and occurs sympatric with multiple species of coastal sage scrub that have interior range limits at low elevation habitats on the edge of the Sonoran Desert where frost is rare.