Erythranthe regni

G. L. Nesom

Phytoneuron 2012-40: 24. 2012.

Common names: King of Arizona monkeyflower
EndemicConservation concern
Treatment appears in FNA Volume 17. Treatment on page 406. Mentioned on page 377, 407.

Annuals, fibrous-rooted, sometimes rooting at proximal nodes. Stems erect to ascending-erect, branched, sometimes becoming slightly fistulose, 15–45 cm, glabrous. Leaves basal and cauline; petiole: proximals 5–25 (–30) mm, mid cauline and distals not connate, 0 mm; blade palmately 5–7-veined, proximal sometimes subpinnate, proximals ovate to depressed-orbicular, 15–20 (–50) × 15–25 (–50) mm, medials and distals broadly depressed-ovate to obtriangular or flabellate, 15–35 mm, largest basal or at mid-stem with distal slightly reduced, base attenuate-cuneate, margins shallowly serrate-dentate, sometimes irregularly, to mucronulate or apiculate, teeth (3–) 5–7 per side, rarely subentire, apex rounded, surfaces glabrous. Flowers plesiogamous, 6–16, from all nodes or medial to distal, cleistogamous. Fruiting pedicels 15–30 mm, longer than subtending leaves, glabrous. Fruiting calyces sparsely purple-dotted, broadly campanulate-cylindric, inflated, sagittally compressed, 7–9 mm, glabrous, throat not closing, adaxial lobe longest. Corollas yellow, not red-dotted, bilaterally or radially symmetric, bilabiate or regular; tube-throat cylindric-funnelform, 9–12 mm, exserted 3–5 mm beyond calyx margin; limb expanded 1–1.5 mm. Styles glabrous. Anthers included, glabrous. Capsules included, 4–5 mm.


Phenology: Flowering Mar–May.
Habitat: Moist to wet, sandy loam soils.
Elevation: 800–1000 m.

Discussion

Erythranthe regni is endemic to the Kofa Mountains of Yuma County; all collections have been made from the Kofa Game Refuge (Kofa National Wildlife Refuge). Because its calyces remain open at maturity, this species is hypothesized to be most closely related to E. geyeri, from which it differs by its erect habit, apparently annual duration, larger leaves, purple-dotted calyces, and corollas with longer tube-throat and barely bilabiate limb. Geography and other morphology, however, suggest that its evolutionary origins are closer to E. guttata.

Selected References

None.

Lower Taxa

None.
... more about "Erythranthe regni"
loculicidal +
rounded +
Guy L. Nesom +  and Naomi S. Fraga +
G. L. Nesom +
rosulate +  and subrosulate +
not persistent +
attenuate-cuneate +
not leathery +  and semifleshy +
compressed +, inflated +  and tubular +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
King of Arizona monkeyflower +
regular +, bilabiate +  and symmetric +
not red-dotted;yellow +
compressed +
800–1000 m. +
hairy +  and glabrous +
nodding;spreading;nodding;spreading;erect +
cleistogamous +
reduced +
Moist to wet, sandy loam soils. +
alternate +, opposite +, rosulate +  and subrosulate +
persistent +  and deciduous +
cauline +  and basal +
expanded +
3 (?) +  and Not 5 (?) +
mostly triangular;deltate +
reduced +  and longer +
apiculate +  and mucronulate +
1.5 cm15 mm <br />0.015 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
basal +  and superior +
tenuinucellate +  and unitegmic +
orthotropous +  and anatropous +
Flowering Mar–May. +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
ovate;depressed-orbicular +
0.5 cm5 mm <br />0.005 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Phytoneuron +
flattened +  and ellipsoid +
3 +  and 5 +
Endemic +  and Conservation concern +
proximal +  and middle +
erect;ascending-erect +
fistulose +
15 cm150 mm <br />0.15 m <br /> (45 cm450 mm <br />0.45 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Mimulus sect. Erythranthe +  and Mimulus subg. Synplacus +
Erythranthe regni +
Erythranthe +
species +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
not closing +
subentire +
rooting +  and fibrous-rooted +
compressed +, inflated +  and campanulate-cylindric +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
perennial +  and annual +
herb +  and subshrub +
terrestrial +  and aquatic +
semiaquatic +  and terrestrial +
9 +, 8 +  and 7 +