Erythranthe geyeri
Erythranthe hallii
Geyer's monkeyflower, mimule de James
Hall's monkeyflower
decumbent-ascending to ascending or erect-ascending, branched, (3–)10–40 cm, glabrous.
erect, simple, 4-angled, 2–8 cm, slender, glabrous.
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.
basal and cauline or basal deciduous, largest at mid stem or above, cauline relatively few on long internodes;
petiole: basal and proximals to midcauline 1–4 mm, distals 0 mm;
blade palmately 3-veined, ovate to ovate-lanceolate, 5–11 × 3–9 mm, base truncate to cuneate, margins very shallowly dentate or denticulate, apex acute to obtuse, surfaces glabrous or distals and bracteals sparsely villous, hairs vitreous, flattened, eglandular, multicellular.
plesiogamous, 2–8(–12), from distal nodes, sometimes from most nodes, very loosely racemose.
plesiogamous, (1–)4–10, sometimes from all nodes, usually beginning about mid stem, cleistogamous.
glabrous.
glabrous.
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.
yellow, usually red-dotted, bilaterally or nearly radially symmetric, bilabiate or nearly regular;
tube-throat narrowly cylindric, 4–6 mm, exserted 0.5–1 mm beyond calyx margin;
limb barely expanded.
18–30 mm, sparsely short villous-glandular or glabrous.
usually deflexed 90º at calyx, 6–14 mm, longer than subtending leaves.
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.
sometimes red-dotted, broadly elliptic-ovoid, inflated, sagittally compressed, (5–)7–10 mm, glabrous, throat closing, adaxial lobe not distinctly longer than abaxial, not falcate.
included, (4.5–)5–8 mm.
included, 4–6 mm.
included, glabrous.
included, glabrous.
= 30.
= 32.
Erythranthe geyeri
Erythranthe hallii
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.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Erythranthe hallii is known from Boulder, Clear Creek, Fremont, Grand, Jefferson, Larimer, Routt, and Saguache counties. The Colorado population system is morphologically and geographically coherent.
Erythranthe hallii is similar to E. arvensis; both have four-angled stems, autogamous reproduction, a tendency to root at basal nodes and distally, and both have bracteal leaves villous with vitreous, flattened, eglandular, multicellular hairs, although this vestiture is barely developed and often absent in E. hallii. The only reported chromosome number from the Colorado plants (2n = 32) also appears to be distinct among possible relatives of E. hallii.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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