Below Elsinore Peak, S. Main Divide, 6-25-11. © Ron Vanderhoff.

Yellow Star-thistle

Centaurea solstitialis

Exotic species on the RED ALERT Emergent Invasives list
(California Native Plant Society, Orange County Chapter)

Native to the Mediterranean region

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San Juan Creek, old bridge to 2.2 mi E, 9-18-11. © Ron Vanderhoff.

Upper Silverado Cyn., 6-28-12. © Ron Vanderhoff.

Hwy 74, .15 mi. NE Tenaja Tr. Trail, 6-24-12. © Ron Vanderhoff.

Elsinore Peak vic, W and S, 5-26-12. © Ron Vanderhoff.

Centaurea solistitialis, Hwy 74, nr. Ortega Falls, 8-15-13. © Ron Vanderhoff.

Centaurea solistitialis, Hwy 74, nr. Ortega Falls, 8-15-13. © Ron Vanderhoff.

Elsinore Peak vic, W and S, 5-26-12. © Ron Vanderhoff.

Acjachemen Meadow, Hwy 74, 7-6-14. © Ron Vanderhoff.

Upper Silverado Cyn., 6-28-12. © Ron Vanderhoff.

Acjachemen Meadow, Hwy 74, 7-6-14. © Ron Vanderhoff.

Left: Centaurea solstitialis; Right: C. melitensis. Elsinore Peak vic, 5-26-12. © Ron Vanderhoff.

Left: Centaurea melitensis; Right: C. solstitialis. Elsinore Peak vic, W and S, 5-26-12. © Ron Vanderhoff.