Scouler's popcornflower blooming in a vernally moist pool near the Catherine Creek parking area, Klickitat County, WA........May 20, 2011. Variety scouleri generally has an ascending or erect growth pattern and flowers that measure 2-4 mm across, which is double those of the prostrate variety penicellatus.
Scouler's popcorn flower is a small annual wildflower with several to many prostrate to ascending stems arising from the base. Plants may occasionally have one stem that is erect. The stems range from 10-30 cm long with leaves mostly limited to the stems. The lower 1-4 pairs of leaves are opposite and linear in shape while the upper leaves are oblong-lanceolate and alternate on the stems. The leaves are up to 6.5 cm long and up to 5 mm wide. The upper leaf surface is mostly smooth while the lower surfaces are covered with stiff hairs. The roots are either taproots or fibrous.
The racemes are single (not paired) with small white flowers on short pedicels (about 1 mm long),, although the lower pedicels may be 5-10 mm long. The petals are only 1-4 mm wide.
Scouler's popcorn flower may be found in moist, poorly drained sites such as vernal ponds, swales, ditches and lake margins. It is found from the lowlands to moderate elevations in the mountains.. It seldom occurs in alkaline habitats.
Scouler's popcorn flower may be found from British Columbia south to California and east to Manitoba and New Mexico.
In the Columbia River Gorge, it may be found between the elevations of 100'-2800' throughout the length of the gorge.
Scouler's popcorn flower is generally seen in vernally moist pools, or along small streams or drainages which dry quickly in spring time as this shallow pool seen near the Catherine Creek parking area, Klickitat County, WA.........May 20, 2011.