Erythranthe michiganensis

(Pennell) G. L. Nesom

Phytoneuron 2012-39: 44. 2012.

Common names: Michigan monkeyflower
EndemicConservation concern
Basionym: Mimulus glabratus subsp. michiganensis Pennell Monogr. Acad. Nat. Sci. Philadelphia 1: 119. 1935
Synonyms: M. glabratus var. michiganensis (Pennell) Fassett M. michiganensis (Pennell) Posto & Prather
Treatment appears in FNA Volume 17. Treatment on page 407. Mentioned on page 374, 408.

Perennials, rhizomatous, usually producing numerous leafy stolons from basal nodes, rooting at distal nodes, sometimes forming mats. Stems ascending-erect or basally decumbent, becoming erect in inflorescence, branched, 12–50 (–70) cm, glabrous or minutely hirtellous and stipitate-glandular. Leaves cauline, basal not persistent; petiole 1–5 (–15) mm, mid-stem and distals 0 mm; blade palmately 3–5-veined, broadly ovate to broadly ovate-elliptic or suborbicular, 8–30 mm, relatively even-sized or diminishing in size distally, bracteal reduced, slightly falcate, base truncate to cuneate, margins evenly or unevenly dentate-serrate to dentate, teeth 3–8 per side, apex usually rounded, surfaces glabrous or minutely hirtellous and stipitate-glandular. Flowers herkogamous, 2–14, mostly from distal nodes or medial to distal nodes. Fruiting pedicels 10–25 mm, villous-glandular to minutely villosulous-glandular. Fruiting calyces cylindric-campanulate, inflated, sagittally compressed, 7–10 mm, puberulous to softly hirtellous, mixed with longer, stipitate-glandular hairs, throat not closing, adaxial lobe 2 times longer than others, slightly upcurving. Corollas yellow, sometimes faintly red-spotted, bilaterally symmetric, strongly bilabiate; tube-throat cylindric-campanulate, 10–14 mm, exserted 5–8 mm beyond calyx margin; limb expanded 10–15 mm. Styles glabrous. Anthers included, glabrous. Capsules unknown. 2n = (28) 30.


Phenology: Flowering Jun–Aug(–Oct).
Habitat: Cold calcareous springs, seeps, depressions, streams, alkaline shorelines at mouths of small drainages, steep moraine slopes, bluff bases, commonly in northern white cedar swamps.
Elevation: 500–600 m.

Discussion

Based on data from allozyme and RAPD studies, morphology, and crossing studies, A. L. Posto and L. A. Prather (2003) raised Erythranthe [Mimulus] michiganensis to specific rank. The species is endemic to a small area in the Mackinac Straits and Grand Traverse regions of Michigan; it is known to be extant at 15 sites and apparently is extinct at three previously known sites. Plants of all but one of the populations are essentially pollen-sterile and reproduce through rhizomes. However, the didynamous stamens and stigma positioned above the adaxial anther pair, along with the relatively large corollas with broadly expanded limb, are reflective of an allogamous breeding system, which seems unusual in view of its apparent sterility. The narrow geographic distribution of E. michiganensis lies within the wider range of E. geyeri, and the two are known to co-occur at two sites, apparently without hybridization or morphologically intermediate individuals.

Erythranthe michiganensis (as Mimulus michiganensis) is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Lower Taxa

None.
... more about "Erythranthe michiganensis"
2 times longer than others +
loculicidal +
rounded +
Guy L. Nesom +  and Naomi S. Fraga +
(Pennell) G. L. Nesom +
rosulate +  and subrosulate +
not persistent +
truncate;cuneate +
Mimulus glabratus subsp. michiganensis +
falcate;broadly ovate;broadly ovate-elliptic or suborbicular +
reduced +, diminishing +  and equal-sized +
0.8 cm8 mm <br />0.008 m <br /> (3 cm30 mm <br />0.03 m <br />) +
not leathery +  and semifleshy +
compressed +, inflated +  and tubular +
Michigan monkeyflower +
red-spotted;yellow +
compressed +
500–600 m. +
hairy +  and glabrous +
villous-glandular +  and minutely villosulous-glandular +
nodding;spreading;nodding;spreading;erect +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
reduced +
Cold calcareous springs, seeps, depressions, streams, alkaline shorelines at mouths of small drainages, steep moraine slopes, bluff bases, commonly in northern white cedar swamps. +
stipitate-glandular;puberulous;softly hirtellous +
compressed +, inflated +  and cylindric-campanulate +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
alternate +, opposite +, rosulate +  and subrosulate +
persistent +  and deciduous +
expanded +
3 (?) +  and Not 5 (?) +
mostly triangular;deltate +
reduced +  and longer +
subentire +  and toothed +
dentate-serrate to dentate +
basal +  and superior +
tenuinucellate +  and unitegmic +
orthotropous +  and anatropous +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering Jun–Aug(–Oct). +
Phytoneuron +
posto2003a +
flattened +  and ellipsoid +
3 +  and 5 +
Endemic +  and Conservation concern +
proximal +  and middle +
50 cm500 mm <br />0.5 m <br /> (70 cm700 mm <br />0.7 m <br />) +
erect;decumbent;ascending-erect +
stipitate-glandular +, hirtellous +  and glabrous +
4-angled +  and terete +
12 cm120 mm <br />0.12 m <br /> (50 cm500 mm <br />0.5 m <br />) +
stipitate-glandular +, hirtellous +  and glabrous +
M. glabratus var. michiganensis +  and M. michiganensis +
Erythranthe michiganensis +
Erythranthe +
species +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
cylindric-campanulate +
not closing +
rooting +  and rhizomatous +
perennial +  and annual +
herb +  and subshrub +
terrestrial +  and aquatic +
semiaquatic +  and terrestrial +
9 +, 8 +  and 7 +