Dehesa Nolina [Nolina interrata Gentry]

Dehesa Nolina [Nolina interrata Gentry]

Listing CNPS List 1B R-E-D Code 3-3-2

State/Federal. Status -- CE/C1 AGAVACEAE Jun.-Jul.

Global Rank G2 State Rank S1.2

Distribution: San Diego County; Baja California, Mexico

Habitat: Open Southern Mixed Chaparral and Chamise Chaparral are the preferred habitats of this distinctive shrub. Near the Dehesa School a series of fires have left stands of this Nolina in a disturbed annual grassland. Most populations apparently occur on Las Posas stony fine sandy loams.

Known Sites: The unique population clustered near Dehesa School shows an atypical, proliferating growth habit; repeated subjection to fire may be an important factor. This species is well scattered in the open scrub west of the school. Healthy colonies are at scattered locales on McGinty Peak; they constitute an important population and should be protected. Vigorous colonies occur on Sequan Peak, and are also found around a broad native grassland approximately 1 mile south of Suncrest. It is also reported on Barber Mountain, near Lawson Valley Road and its intersection with Skyline Truck Trail, Jamul Butte, Wood Valley, Pat's Mountain, and on the west side of Sloane Canyon on The Mesa.

Three populations are known in Baja California with the southernmost being at Rancho de la Cruz north of Ensenada at 31 58' North; where collected by Moran (SD 109041). This specimen is located in the San Diego Natural History Museum's herbarium. It is also reported from Canon Arce and Rancho la Fortuna.

Status: The Dehesa Nolina populations in San Diego County are presently stable, but are being slowly impacted by the clearing of lands for isolated homesites. All populations should be protected.

Copyright May 1994 Craig H. Reiser.

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