Erythranthe inflatula
disappearing monkey-flower

Distribution: Occurring east of the Cascades crest in Klickitat County in Washington; south-central Washington to northeastern California, east to southwestern Idaho and Nevada.

Habitat: Moist to wet open areas at low elevations.

Flowers: May-July

Origin: Native

Growth Duration: Annual

Conservation Status: Review Group 1 in Washington (WANHP)


Annuals with fibrous roots or filiform-taproot; stems 6-20 cm, erect to ascending, straight or sharply bent at nodes, unbranched or branched near base to mid-stem, covered with minute stipitate-glands, gland-tipped hairs 0.1-0.3 mm.


Leaves mostly cauline, basal leaves generally not persistent by flowering; petioles 1-3 mm near base, becoming sessile distally; blade elliptic to lanceolate to narrowly ovate, 8-18 mm long and 3-7 mm broad, mostly evenly sized throughout or somewhat reduced distally, palmate venation with 3-5 veins, base attenuate to obtuse to rounded, margins entire to finely toothed, apex acute to obtuse, surfaces glandular as stems.


Axillary flowers 10-20, emerging from mid- to ends of stems; fruiting pedicels not curved or bent, 7-18 mm, glandular as stems; calyx winged, ridged, maturing to ovoid-ellipsoid to bell-shaped or widely urn-shaped, distinctly inflated, 7-11 mm, margins distinctly toothed or lobed, sparsely covered with minute and rigid hairs, eglandular, lobes pronounced, erect; corollas yellow to light yellow, with sparse red dots or not, symmetric bilaterally, slightly bilabiate; tube-throat cylindric, 5-8 mm, protruding 1-3 mm beyond calyx margin; limb only slightly widened, lobes widely obovate, apex rounded to mucronate; styles glabrous; anthers not protruding, glabrous.


Capsules 5-9 mm, included.

Accepted Name:
Erythranthe inflatula (Suksd.) G.L. Nesom
Publication: Phytoneuron 2012-39: 38. 2012.

Synonyms & Misapplications:
Mimulus inflatulus Suksd.
Additional Resources:

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

WA Flora Checklist: Erythranthe inflatula checklist entry

OregonFlora: Erythranthe inflatula information

E-Flora BC: Erythranthe inflatula atlas page

CalPhotos: Erythranthe inflatula photos

9 photographs:
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