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Erythranthe scouleri

Erythranthe scouleri (Hook.) G.L.Nesom

Scouler's Monkeyflower, Columbia River Monkeyflower

Phrymaceae (Lopseed Family)

Synonym(s): Mimulus guttatus ssp. scouleri, Mimulus scouleri

USDA Symbol: ERSC14

USDA Native Status: L48 (N), CAN (N)

"Perennials, rhizomatous, producing long, sparsely leafy runners from basal nodes. Stems erect, simple or few-branched, 15-80 cm, glabrous." (Webref: 38).

"Erythranthe scouleri is distinctive in its oblong-elliptic leaves with long-tapering bases and closely toothed margins, completely glabrous vestiture, long, leafy runners from basal cauline nodes, large corollas with broad limbs, and prominently hairy styles. Several features suggest a close relationship to E. decora, particularly its very large corollas, hairy styles, closely toothed leaf margins, tall, simple, and erect stems, numerous runners, and its geographic range. All collections apparently have been made near the mouth of the Columbia River in Clatsop and Columbia counties, Oregon (G. L. Nesom 2013d). Recent observations (Alexander John Wright, pers. comm.; photos http://www.inaturalist.org/observations/3537008) indicate that it also occurs in Wahkiakum County, Washington, in the Julia Butler Hansen Refuge." (Webref: 38).

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Plant Characteristics

Duration: Perennial
Habit: Herb
Leaf Pubescence: Glabrous
Leaf Margin: Crenate , Dentate
Leaf Apex: Acute , Obtuse
Size Notes: To about 30 inches in height.
Leaf: "Leaves cauline, basal usually not persistent; petiole: proximals and medial 10-25 mm (gradually merging into blade), distals 0 mm; blade palmately (3-)5-7-veined to subpinnate, (proximal to medial) oblong-elliptic to oblong-lanceolate, 25-60 x 8-18 mm, usually 3-4 times longer than wide, base attenuate, margins evenly, shallowly dentate or crenate to mucronate or mucronulate, teeth 10-20 per side, sometimes more deeply toothed at base, apex obtuse to acute, surfaces glabrous." (Webref: 38).
Flower: "Flowers herkogamous, (1 or)2-8, from distal nodes. Fruiting pedicels 20-25 mm, glabrous. Fruiting calyces ovoid, inflated, sagittally compressed, 13-14 mm, glabrous, throat closing. Corollas yellow, without red markings, bilaterally symmetric, bilabiate; tube-throat funnelform, 20-24 mm, exserted 10-15 mm beyond calyx margin; limb expanded 22-30 mm. Styles minutely, prominently hirsutulous to villosulous. Anthers included, glabrous." (Webref: 38).
Fruit: "Capsules unknown." (Webref: 38).

Bloom Information

Bloom Color: Red , Yellow
Bloom Time: May , Jun , Jul , Aug
Bloom Notes: "Phenology: Flowering May-Aug."� (Webref: 38).

Distribution

USA: OR , WA
Canada: BC
Native Distribution: Oregon, Washington, British Columbia
Native Habitat: "Flowering May-Aug. Habitat: Salt marshes, river banks. Elevation: 0-20 m." (Webref: 38).

Benefit

Conspicuous Flowers: yes

Find Seed or Plants

View propagation protocol from Native Plants Network.

From the National Organizations Directory

According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:

Santa Barbara Botanic Garden - Santa Barbara, CA

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Erythranthe scouleri in USDA Plants
FNA: Find Erythranthe scouleri in the Flora of North America (if available)
Google: Search Google for Erythranthe scouleri

Metadata

Record Modified: 2026-05-19
Research By: Joseph A. Marcus

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