Erythranthe caespitosa
large mountain monkey-flower

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


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.

Accepted Name:
Erythranthe caespitosa (Greene) G.L. Nesom
Publication: Phytoneuron 2012-39: 1–60. 2012.

Synonyms & Misapplications:
Mimulus tilingii Regel var. caespitosus (Greene) A.L. Grant [HC]
Additional Resources:

PNW Herbaria: Specimen records of Erythranthe caespitosa in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Erythranthe caespitosa checklist entry.

E-Flora BC: Erythranthe caespitosa atlas page.

CalPhotos: Erythranthe caespitosa photos.

USDA Plants: Erythranthe caespitosa information.

35 photographs:
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