[Ocean Sprays: The Genus Holodiscus East
of the Cascades of Oregon and Washington]
Bush Ocean Spray, Gland Ocean Spray, Rockspiraea, Rock Spiraea
Holodiscus microphyllus var. glabrescens
Synonyms: Holodiscus dumosus, Holodiscus dumosus var. glabrescens, Holodiscus glabrescens
Rockspiraea as seen on gravelly slopes along the Canyon Mt. Trail #218, Strawberry Mountain Wilderness.........August 1, 2011.
Gland ocean spray is a low, much-branched shrub from 0.5-2 meters
tall. The twigs are often reddish, while the bark of older branches may be a
deep grayish-red. The greenish, glabrous to hairy leaves are often clustered
(6-7) at the ends of short spur branches, or found alternating on newer, long
branches. The leaf blades may be up to 2 cm in length and may have up to 15
The small white flowers (5 petals) are up to 5 mm wide, and found
in a few to several branched panicle. The latter may sometimes be replaced by
a racemose inflorescence. Each of the petals is elliptic-oval in shape and about
2 mm long. The numerous stamens are about equal in length to the petals.
Lower (left) and upper (right) surfaces of gland
ocean spray from Lambertson Butte, Mt. Hood Wilderness.........August 14, 1998.
Gland ocean spray is found from desert valleys and hillsides to montane slopes.
Gland ocean spray is found
from south-central Oregon to California and eastward through central Idaho to
northwest Wyoming, Colorado, New Mexico, Utah, Arizona, and Nevada.
Rockspiraea beginning to bloom on rock outcrops above 8600' along the North Loop Road about one-half mile downhill from the Kiger Gorge Overlook, Steens Mountain, Harney County, Oregon........August 31, 2011.
Rockspiraea in bloom on the summit ridge of Pine Mountain, Deschutes National Forest.........July 12, 2017.
Rockspiraea blooming (left) on serpentine slopes along the Canyon Mountain Trail #218, Strawberry Mountain Wilderness.........August 19, 2011 The photo at right shows rockspiraea blooming on rock outcrops along the Gray Butte Trail #852 , Crooked River National Grassland.........June 24, 2017.
Rockspiraea in bloom along Road 4011-015 below the summit of Crane Mountain, Fremont-Winema National Forest.......August 1, 2020.
Pubescent leaves of rockspiraea as seen (left) on gravelly slopes along the Canyon Mt. Trail #218, Strawberry Mountain Wilderness..........August 1, 2011. The photo at right as seen along the Gray Butte Trail #852, Crooked River National Grasslands.........May 20, 2017.