Distribution: Occurring in the Olympics and Cascades mountains of Washington; British Columbia south to Oregon, east to Idaho.
Habitat: Wet meadows and wet, rocky slopes at high elevations in the mountains.
Flowers: July-September
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Bees
Rhizomatous perennials, rooting at nodes nearest the base, occasionally producing runners with creeping form and small leaves, forming colonies of mats, rhizomes threadlike; stems 3-10 cm, usually prostrate or with some curving upward distally, usually massed, round or somewhat flat, branching, may be glabrous or slightly hirtellous or with stalked glands.
Leaves both basal and cauline; petiolate, proximal petioles 2-5 mm, becoming sessile distally; blade commonly purplish beneath, orbicular to ovate to narrowly elliptic, leaves nearest base somewhat lyrate, 3-12 mm and becoming larger farther from base, palmate venation with 3 veins, base wedge-shaped, margins entire to barely finely toothed, apex obtuse, somewhat puberulent above and beneath, hairs minute and stipitate-glandular.
Axillary flowers 1-3, from nodes farthest from base, usually solitary; fruiting pedicels generally 10-30 mm, somewhat villous with short gland-tipped hairs, occasionally hirtellous; calyx broadly bell-shaped, inflated, compressed along sagittal plane, 7-15 mm, glabrous or hirtellous or stipitate-glandular, throat closing, lobe pair nearest base curving upwards, other lobes 3-5 mm, prominently protruding; corollas yellow with dark red spots, symmetric bilaterally, bilabiate; tube-throat widely funnel-shaped to nearly cylindric, 15-18 mm, protruding beyond calyx margin; lower limb deflexed and spreading, upper limb curving upward, palate partially closed; styles slightly hirtellous; anthers not protruding, glabrous.
Capsules 4-5 mm, included.
PNW Herbaria: Specimen records of Erythranthe caespitosa in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Erythranthe caespitosa checklist entry
OregonFlora: Erythranthe caespitosa information
E-Flora BC: Erythranthe caespitosa atlas page
CalPhotos: Erythranthe caespitosa photos