Synonym: Boisduvalia stricta
Flower of brook spike-primrose as seen at Catherine Creek in the Columbia River Gorge...............June 3, 2009. Note the numerous spreading hairs on the stem and leaves.
Stiff spike-primrose is also known as brook spike-primrose. It is an annual wildflower with one to many branched stems arising at the base. The branches when present are closely oriented to the central stem. The herbage is grayish in color due to a dense covering of soft, straight, eglandular hairs. The numerous leaves are linear or narrowly lanceolate with entire to occasionally toothed margins. The leaves range from 1-4 cm long and 1-2.5 mm wide.
The inflorescence ranges from congested to loosely elongated with floral bracts (smaller than the leaves) subtending each flower. The 4 petals are pink or purple with each usually measuring 2 mm long. The tips of each petal is deeply cleft.
Stiff spike-primrose grows along the margins of vernal ponds and streams.
Stiff spike-primrose may be found from eastern Washington south through Oregon (on both sides of the Cascades) to central California and east to Idaho and Nevada..
In the Columbia River Gorge, it may be found between the elevations of 100'-2000' from Bingen, WA east to Horsethief Lake State Park.