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Fabre, Carl
Erythranthe geyeri
Erythranthe geyeri (Torr.) G.L.Nesom
Geyer's Monkeyflower, Geyer's Yellow Monkeyflower, Roundleaf Monkeyflower
Phrymaceae (Lopseed Family)
Synonym(s): Mimulus geyeri, Mimulus glabratus ssp. fremontii, Mimulus glabratus var. fremontii, Mimulus glabratus var. jamesii, Mimulus glabratus var. oklahomensis, Mimulus jamesii, Mimulus jamesii var. fremontii, Mimulus reniformis
USDA Symbol: ERGE2
USDA Native Status: L48 (N), CAN (N)
“Perennials, rhizomatous, rooting at nodes. Stems decumbent-ascending to ascending or erect-ascending, branched, (3–)10–40 cm, glabrous.” (Webref: 38).
“Erythranthe geyeri has commonly been regarded as conspecific with E. glabrata (Kunth) G. L. Nesom (as Mimulus glabratus var. jamesii), but typical E. glabrata has a different chromosome number and distinct morphology and its range does not reach the United States. In Mexico, the two species are broadly sympatric without intermediates. An allozyme study of the M. glabratus complex (R. K. Vickery 1990) indicated that the Great Plains populations of E. geyeri are distinct from those in New Mexico and Mexico, corresponding to a difference in pedicel vestiture.” (Webref: 38).
Plant Characteristics
Duration: PerennialHabit: Herb
Leaf Pubescence: Glabrous , Glandular
Leaf Margin: Dentate
Leaf Base: Cuneate , Truncate
Fruit Type: Capsule
Size Notes: To about 16 inches tall.
Leaf: “Leaves cauline, basal not persistent; petiole 3–10(–20) mm or 0 mm distally; blade palmately 3–5-veined, suborbicular to depressed-ovate or broadly elliptic-ovate to reniform, 6–25 mm, relatively even-sized or largest often at mid stem, bracteal reduced, base cuneate to truncate or subcordate, margins shallowly dentate to crenate-dentate, teeth 3–7(–10) per side, apex rounded, adaxial surface of distals sparsely short villous-glandular or glabrous.” (Webref: 38).
Flower: “Flowers plesiogamous, 2–8(–12), from distal nodes, sometimes from most nodes, very loosely racemose. Fruiting pedicels 18–30 mm, sparsely short villous-glandular or glabrous. Fruiting calyces obtriangular to broadly obtriangular or deeply cupulate, inflated, sagittally compressed, (7–)8–12 mm, sparsely short villous-glandular or glabrous, throat not closing, lateral lobes shallowly convex-mucronulate, adaxial ovate with apex rounded. Corollas yellow, sparsely red-dotted or not, bilaterally symmetric, weakly bilabiate; tube-throat cylindric-funnelform, 6–8 mm, exserted 1–3 mm beyond calyx margin; limb expanded 5–8 mm. Styles glabrous. Anthers included, glabrous.” (Webref: 38).
Fruit: “Capsules included, (4.5–)5–8 mm.” (Webref: 38).
Bloom Information
Bloom Color: Red , YellowBloom Time: May , Jun , Jul , Aug , Sep , Oct
Bloom Notes: “Phenology: Flowering May–Aug(–Oct).” (Webref: 38).
Distribution
USA: AZ , CO , IA , IL , KS , MI , MN , MO , MT , ND , NE , NM , OK , PA , SD , TX , WI , WYCanada: AB , MB , ON , QC , SK
Native Distribution: Central third of the US, most of Canada and nearly all of Mexico.
Native Habitat: "Edges of flowing streams, marsh edges, drainage ditches, seepage areas, springs, muddy or moist banks. Elevation: 200–2500 m.” (Webref: 38).
Growing Conditions
Water Use: HighLight Requirement: Sun
Soil Moisture: Wet
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 geyeri in USDA PlantsFNA: Find Erythranthe geyeri in the Flora of North America (if available)
Google: Search Google for Erythranthe geyeri
Metadata
Record Modified: 2025-10-20Research By: Joseph A. Marcus