Xylorhiza orcuttii (Vasey & Rose) Greene
Aster orcuttii Vasey & Rose
Machaeranthera orcuttii (Vasey & Rose) Cronquist & D.D. Keck
Orcutt’s Aster, Orcutt’s Woody Aster, Borego Aster, Mojave Aster
Orcutt’s aster is an endangered species native to California and Baja California in Mexico.
Identification: This aster is a smooth-stemmed shrub less than 5' (1.5 m) in height. Leaves are variable: oblong or lance-shaped, ¾-2" (2-6 cm) x ⅛-1" (5-26 mm), with smooth or spiny edges. Light blue flowers are about 1-2½" (3-7 cm) in diameter, composed of 25-40 rays around a yellow center. (The yellow center is itself composed of 55-140 tiny flowers.) Fruits are ¹/₁₆-⅛" (3-4 mm) in size, surrounded by a bristly pappus up to ⅜" (1 cm). Plants are found in arid canyons at elevations of 66-984' (20-300 m).
Xylorhiza orcuttii at the San Diego Sierra Club
Xylorhiza orcuttii on the US Department of the Interior Bureau of Land Management in California
Xylorhiza orcuttii on CalPhotos
Xylorhiza orcuttii from the Jepson Manual
Xylorhiza orcuttii at the Lady Bird Johnson Wildflower Center
Xylorhiza orcuttii description by Thomas H. Kent, last updated 12 Oct 2018.