Common Yampah, Gairdner's Yampah, Gardner's Yampah, Squawroot, Western False Caraway
Perideridia gairdneri ssp. borealis
The photo above shows a view downwards onto the top of the umbel of yampah. Note the numerous small white flowers. Photographed at Catherine Creek in the central Columbia River Gorge...........July 7, 2006.
photo at right shows the upper leaves and several umbels of yampah as seen along
the Chief Joseph Trail in the Eagle Cap Wilderness just west of Wallowa Lake.......July
27, 1997. The photo clearly shows the multiple umbels on the same stem.
Also known as western false caraway and squawroot, yampah is a glabrous perennial
wildflower with a slender erect, sinuous stem from 30-100 cm high arising from
a cluster of fleshy roots. The leaves are pinnately compound (or occasionally
bipinnately compound) and measure from 10-20 cm long with wide petioles. The
few, narrowly linear leaflets are 5-15 cm long (See photo above.). The several
leaves are evenly spaced along the stems and are only slightly reduced in size
upwards on the stem. The lower leaves often wither by the time of flowering.
The inflorescence consists of 3-10 umbels with 8-16 rays measuring up to 6
cm long. Typically, the umbels are each subtended by several awl-shaped bracts.
The umbellets are each subtended by several narrow bractlets while the pedicels
are 4-6 mm long. The flowers vary from white to pinkish in color and the petals
usually have 5-7 evident veins from the base and are notched at the tip. The
fruits are broadly oval and measure from 1-3.5 mm long and about as wide. The
surface of the fruit is covered with minute ribs.
Yampah may be found on moist to dry, rocky hillsides, woodlands or in moist
to dry meadows from the foothills to about 2500 meters of elevation in the mountains.
Yampah may be found from southern British Columbia south to the east of the
Cascade Mts. to northern California and east to the Snake River Plain and Caribou
Range of Idaho and northern Nevada and northern Utah. It is found further eat
to central Colorado, western South Dakota and southwestern Saskatchewan.
It may be found in the Columbia River Gorge between the elevations of 100'-3000'
from near Cape Horn east to the crest of the Columbia Hills in the eastern Columbia
Close-up view of the basal leaf of Gairdner's yampah as seen in moist riparian or seep areas that dry by late spring on the Labyrinth, mid-Columbia River Gorge.........April 15, 2010. The basal leaves have often dried and disappeared by the time the plants flower in early summer.
Gairdner's yampah as seen along the trail high above Rowland Lake and the Labyrinth, Columbia River Gorge..........August 29, 2013.
Basal leaves of Gairdner's yampah as seen at left on vernally moist slopes east of Eightmile Creek and above the Crawford Oaks Trailhead, Columbia Hills State Park.........March 23, 2016. The photo at right shows a leaf of Gairdner's yampah as observed in moist swales between Memaloose and Rowena.......February 3, 2020.
The photo above shows an upper stem leaf and umbel of yampah as seen on rock outcrops below fairly heavy timber along the Chief Joseph Trail in the Eagle Cap Wilderness just west of Wallowa Lake......July 27, 1997.
The photo above shows the long, narrow segments
of a stem leaf of yampah as seen along the Chief Joseph Trail in the Eagle Cap
Wilderness just west of Wallowa Lake.........July 27, 1997.