Lessingia filaginifolia (Hook. & Arn.) Lane var. filaginifolia]

Lessingia filaginifolia (Hook. & Arn.) Lane var. filaginifolia]

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

State/Federal. Status None ASTERACEAE Jun.-Aug.

Global Rank G4T1 State Rank S1.1

Distribution: San Diego County; Baja California, Mexico

Habitat: Coastal chaparral, primarily in sandy openings between Chamise, is a typical microhabitat utilized at Point Loma. Point Loma has an insular weather pattern with regular fogs, which is underscored by its possible island status in the geologic past. The trend towards gigantism, in this case the larger involucre of the San Diego Sand Aster, is a floristic trend sometimes associated with the Channel Islands. Carlsbad gravelly loamy sand is the soil type mapped for the ridgeline at Point Loma with Gaviota fine sandy loam downslope.

Known Sites: This entity has distinctive, large involucral heads when compared with other forms. It grows on federal property near Fort Rosecrans on Point Loma. Much of this population is endangered by expansion of Naval facilities on Point Loma. It also extends southward into the Cabrillo National Monument. Herbarium specimens annotated by Dr. Meredith Lane are from Spooner's Mesa near the Tijuana River Valley, Pacific Beach, and Ocean Beach: all sites where it is possibly extirpated. Two of her other annotated specimens, from well inland near Potrero and Oak Grove, are probably examples of the common, wide ranging form of Cudweed Aster with unusually large involucral heads. Coastal specimens from Santa Rosa Island, and beach locales well to the north at Morro Bay, Santa Maria, and Guadalupe have similar large flowering heads.

Two specimens from Baja California are found at the San Diego Natural History Museum, south to 32 5' North where collected by Moran (SD 105274) near La Mision.

Status: The San Diego Sand Aster is substantially declining on Point Loma; primarily due to expansion of naval facilities. Little of its original habitat on the immediate coast is still available. Recent taxonomic review (Dr. Meredith Lane, Kansas) has referred this entity to the very common and wide ranging Cudweed Aster (Lessingia filaginifolia var. filaginifolia). However, opinion in the botanical community is divided and the CNPS notes additional taxonomic study is merited; provisionally all populations should be protected.

Del Mar Mesa Sand-Aster [Corethrogyne filaginifolia (H. & A.) Nutt. var. linifolia Hall Lessingia


Copyright May 1994 Craig H. Reiser.

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