Erythranthe hallii

(Greene) G. L. Nesom

Phytoneuron 2012-39: 43. 2012.

Common names: Hall’s monkeyflower
Endemic
Basionym: Mimulus hallii Greene Bull. Calif. Acad. Sci. 1: 113. 1885
Synonyms: M. guttatus var. hallii (Greene) A. L. Grant
Treatment appears in FNA Volume 17. Treatment on page 423. Mentioned on page 377.

Annuals, fibrous-rooted, sometimes apparently rooting at proximal nodes if stems proximally decumbent. Stems erect, simple, 4-angled, 2–8 cm, slender, glabrous. Leaves 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 ovatelanceolate, 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. Flowers plesiogamous, (1–) 4–10, sometimes from all nodes, usually beginning about mid-stem, cleistogamous. Fruiting pedicels usually deflexed 90º at calyx, 6–14 mm, longer than subtending leaves. Fruiting calyces 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. Corollas 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. Styles glabrous. Anthers included, glabrous. Capsules included, 4–6 mm. 2n = 32.


Phenology: Flowering May–Aug.
Habitat: Ledges, seeps, along streams, wet meadows.
Elevation: 1900–3200 m.

Discussion

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.

Selected References

None.

Lower Taxa

None.
... more about "Erythranthe hallii"
not distinctly longer +
loculicidal +
acute +  and obtuse +
Guy L. Nesom +  and Naomi S. Fraga +
(Greene) G. L. Nesom +
rosulate +  and subrosulate +
not persistent +
truncate;cuneate +
Mimulus hallii +
0.5 cm5 mm <br />0.005 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
ovate;ovatelanceolate +
not leathery +  and semifleshy +
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
compressed +, inflated +  and tubular +
0.6 cm6 mm <br />0.006 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Hall’s monkeyflower +
regular +, bilabiate +  and symmetric +
red-dotted;yellow +
compressed +
1900–3200 m. +
hairy +  and glabrous +
nodding;spreading;nodding;spreading;erect +
cleistogamous +
reduced +
Ledges, seeps, along streams, wet meadows. +
multicellular +  and eglandular +
flattened +
alternate +, opposite +, rosulate +  and subrosulate +
deciduous +
basal +  and cauline +
largest +
expanded +
3 (?) +  and Not 5 (?) +
mostly triangular;deltate +
reduced +  and longer +
denticulate +  and dentate +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
basal +  and superior +
tenuinucellate +  and unitegmic +
orthotropous +  and anatropous +
Flowering May–Aug. +
Phytoneuron +
flattened +  and ellipsoid +
3 +  and 5 +
proximal +  and middle +
4-angled +
slender +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
M. guttatus var. hallii +
Erythranthe hallii +
Erythranthe +
species +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
rooting +  and fibrous-rooted +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
compressed +, inflated +  and elliptic-ovoid +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
perennial +  and annual +
herb +  and subshrub +
terrestrial +  and aquatic +
semiaquatic +  and terrestrial +
9 +, 8 +  and 7 +