Sticky Geraea [Geraea viscida (Gray) Blake]

Sticky Geraea [Geraea viscida (Gray) Blake]

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

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

Global Rank G? State Rank S?

Distribution: San Diego County, Imperial County; Baja California, Mexico

Habitat: High desert chaparral openings are the preferred habitat for this short-lived herbaceous perennial. Sandy, xeric locales are frequently utilized; infrequent fires seem to stimulate the spread of this species. Chamise is the most common constituent of the chaparral in the east San Diego County region where Sticky Geraea occurs; soils include Tollhouse rocky coarse sandy loam.

Known Sites: The distinctive dried remains of this species were seen growing in sandy exposed locales along Kitchen Creek Road. The habitat is generally high, transitional desert in sparsely inhabited portions of the county. An extensive population is found in the Smuggler's Cave region east of Jacumba. Most of this population occurs in Imperial County and meanders across the fencing into the Sierra Juarez Mountains of Baja California. Old reports are from Potrero, Campo, and Dubber. Old biological survey reports are from the intersection of Tierra del Sol Road and Highway 94, northwest of the intersection of Highway 94 and La Posta Road, near Tierra del Sol Road 2 miles south of the community of Tierra del Sol, 2 miles north of Cameron Corners, near Old Highway 80 and Carrizo Gorge Road, between Interstate 8 and Highway 94 east of Boulevard, along McCain Valley Road, in the boulder fields near Bankhead Springs, north of Highway 94 near Tierra del Sol Road, south of Old Highway 80 near the corner of the La Posta Indian Reservation, east of Tierra del Sol near the railroad right-of-way, just south of Boulevard, and 0.5 mile north of Manzanita and east of Jewell Road.

Sticky Geraea has 26 specimens for Baja California within the San Diego Natural History Museum's herbarium. It ranges south to 28 53' North where it was collected on the east slope of Cerro Santa Marta by Moran (SD 63006) in the Sierra San Borja. Its typical habitat here is with chamise, junipers, and piñons. It was relatively common in 1991 on a burn west of the turnoff to Rosa de Castillas, Mexico, on the road to La Rumarosa; as well as locally abundant just east of La Rumarosa.

Status: Sticky Geraea populations in San Diego County are presumed stable based on the limited development within its relatively wide-ranging habitat on the high desert.

Copyright © May 1994 Craig H. Reiser.

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