Ramona Horkelia [Horkelia truncata Rydb.]

Ramona Horkelia [Horkelia truncata Rydb.]

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

State/Federal. Status -- /C3c ROSACEAE May-Jun.

Global Rank G3 State Rank S2.2

Distribution: San Diego County; Baja California, Mexico

Habitat: Chamise Chaparral is usually common at Ramona Horkelia sites. The extensive populations along Roblar Grade occur in a low-growing, moderately dense chaparral mapped with Cieneba very rocky coarse sandy loam. Also seen here were substantial numbers of manzanitas and Salvia clevelandii.

Known Sites: A very large population of Ramona Horkelia was recently discovered on Roblar Grade in the Santa Margarita Mountains. It is rare on Mount Woodson and locally common near the peak at Black Mountain-Lusardi. Old reports are from Temescal Valley near Mesa Grande, Viejas Mountain, and McGinty Mountain. A sizeable population has recently been reported on Iron Mountain. Herbarium collections from the County include sites near Hidden Glen, the south slope of Roderick Mountain, above Flynn Springs, the south fork of Featherstone Creek, and the northeastern slope of El Cajon Mountain. Old biological survey reports note this species on the north slope of Lawson Peak and nearby on the north slope of Gaskill Peak. Data Base reports are for 1.2 miles south of the upper San Luis Rey river and 0.7 mile west of Lusardi Canyon (i.e., Black Mountain), 1 mile northwest of the junction of Deer Springs Road and Interstate 15, along the Tule Springs Road for 1 mile to the Rancho Alegria Gate approximately 1 mile southwest of Mineral Hill, 0.75 mile south of Wildcat Spring and 1 mile north of the Burney Ranch in the Tule Springs region.

One specimen from Baja California is found at the herbarium of the San Diego Natural History Museum; collected at 32 4' North on the north slope of Cerro Blanco by Moran (SD 73044).

Status: Ramona Horkelia populations are presently stable, given the limited historical development to its foothill habitat. The Roblar Grade population is an important site and deserves specific protection from USMC Camp Pendleton. All populations should be protected.

Copyright May 1994 Craig H. Reiser.

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