Flora of North America species comparison

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Erythranthe nasuta

Erythranthe thermalis

calyx-nose monkeyflower, erythranthe nasuta, large-nose monkey-flower, little yellow monkey-flower, snouted monkey-flower

Yellowstone monkeyflower
Habit Annuals, fibrous-rooted or slender-taprooted. Annuals, taprooted, rarely with a basal, runnerlike stem.
Stems

erect to ascending-erect or decumbent, simple or branched from proximal nodes, 4-angled, sometimes shallowly 4-winged, thin-wiry, or fistulose, 2–35(–100) cm, glabrous except for a consistently small, villous-glandular area just above nodes, sometimes hirtellous distally.

erect, simple or branched from basal nodes, 1.5–10(–15) cm, villous-glandular proximally, moderately to densely stipitate-glandular, sometimes hirtellous and eglandular distally.
Leaves

basal and cauline or basal not persistent;

petiole: proximals to medials 3–35 mm, base narrowly flanged, distals 0 mm;

blade ± red tinged abaxially or purple-spotted, palmately 3–5-veined, elliptic-ovate to broadly ovate, suborbicular, or depressed-ovate, (5–)10–49(–80) × (3–)10–25(–60) mm, as long as wide or wider than long, proximals largest and persistent, base cuneate to truncate or subcordate, margins irregularly dentate to dentate-serrate or nearly lacerate-dentate, commonly doubly toothed, main teeth 4–9 per side, sometimes sublacerate to sublyrate basally, apex acute to obtuse, surfaces glabrous, sometimes hirtellous, hairs dull, terete, sharp-pointed, eglandular.

basal and cauline, cauline 2–5 pairs;

petiole: basal and proximal cauline 3–20 mm, distals 0 mm;

blade palmately 3–5-veined, suborbicular to ovate, depressed-ovate, ovate-deltate, or reniform, 4–15(–20) × 4–20 mm, base cuneate to truncate or subcordate, margins evenly crenate-dentate to subentire, apex acute to obtuse or rounded, surfaces moderately to densely stipitate-glandular, sometimes hirtellous and eglandular.
Flowers

plesiogamous, (1 or)2–12(–20), from distal nodes, sometimes from medial to distal, chasmogamous or cleistogamous.

plesiogamous, 1–5(–9), usually at distal nodes, chasmogamous.
Styles

minutely scabrous or glabrous.

hirtellous.
Corollas

yellow, throat usually red-spotted, abaxial limb base usually with a red splotch, bilaterally symmetric, weakly bilabiate;

tube-throat broadly cylindric, (5–)8–12 mm, exserted (0–)1–2 mm beyond calyx margin;

limb expanded 6–12 mm.

yellow, red-dotted or not, bilaterally symmetric, strongly bilabiate;

tube-throat funnelform, 8–12 mm, exserted 1–2 mm beyond calyx margin;

limb expanded 12–15 mm, throat open, palate villous.
Fruiting pedicels

(3–)7–20(–40) mm, longer than subtending leaves, glabrate, sometimes glandular-villous adaxially at axils.

7–12 mm, moderately to densely stipitate-glandular, sometimes hirtellous and eglandular.
Fruiting calyces

nodding 30–180º, usually purple-tinged or -spotted, ovoid-campanulate, inflated, sagittally compressed, (5–)10–15(–19) mm, glabrous or minutely hirtellous to appressed-hirtellous, minutely short-ciliate at sinuses, throat closing, adaxial lobe usually longer than abaxial, slightlty falcate.

ovate-campanulate, inflated, sagittally compressed, 8–11 mm, moderately to densely stipitate-glandular, sometimes hirtellous and eglandular, throat closing, adaxial lobe longer than others.
Capsules

included, (4–)5–9(–10) mm.

included, 5–6 mm.
Anthers

included, glabrous.

included, glabrous.
2n

= 26, 28, 56.

= 28.

Erythranthe nasuta

Erythranthe thermalis
Phenology Flowering (Mar–)Apr–Jun(–Jul). Flowering Mar–Aug.
Habitat Cliff faces, ledges, crevices, and bases, wet rocks in rivers, streamsides, sand bars, mossy seeps, wet clay banks, moist fields, sandy soils, depressions over granite, roadsides. Hot, shallow, quick-drying soils around thermal pools and vents.
Elevation (0–)600–2300(–3200) m. ((0–)2000–7500(–10500) ft.) 2200–2600 m. (7200–8500 ft.)
Distribution
from FNA
AZ; CA; ID; NM; NV; OR; UT; WA; BC; Mexico (Baja California, Sonora)
[WildflowerSearch map]
from FNA
WY
Discussion

Erythranthe nasuta is characterized by its annual duration (fibrous-rooted), four-angled stems, broadly ovate leaves commonly with irregularly toothed margins, calyces with longish, protruding adaxial lobes, and short corollas (all autogamous, chasmogamous or cleistogamous). Flowers may vary significantly in size, even on a single plant. Plants commonly produce tiny cleistogamous flowers on branches (usually at the base of the plant) separate from those with larger flowers. At least the distal and bracteal leaves consistently have hirtellous to hirsutulous adaxial surfaces, even in the smallest of plants. Glandular vestiture is produced only in the axils. Some plants, apparently at the upper limits of populational variability, produce thick-fistulose stems to 100 cm, large leaves (to 80 × 60 mm), and large fruiting calyces (16–19 mm).

Plants described as Mimulus sookensis (B. G. Benedict 1993; Benedict et al. 2012) are tetraploid and have been hypothesized to have arisen as alloploids between Erythranthe nasuta and E. microphylla in two or more independent events. In morphology, however, they are indistinguishable from E. nasuta and are treated here within it. In contrast, experimental hybrids and naturally occurring nasuta-microphylla hybrids apparently of contemporary origin are intermediate in morphology (see review by G. L. Nesom 2013e). The tetraploid occurs from northern California to southwestern British Columbia (A. L. Sweigart et al. 2008; Benedict et al. 2012).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Erythranthe thermalis is endemic to Yellowstone National Park in northwestern Wyoming. The species is recognized by its annual duration (without rhizomes), reduced stature and leaf size, and short, but broad-limbed, corollas with autogamous fertilization. Typical E. guttata (rhizomatous, herkogamous) also grows in the immediately surrounding areas but apparently not in hot soils. Each species maintains distinctions in growth form, phenology and mating system in common garden experiments (Y. Lekberg et al. 2012).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 418. FNA vol. 17, p. 413.
Parent taxa Phrymaceae > Erythranthe Phrymaceae > Erythranthe
Sibling taxa
E. acutidens, E. alsinoides, E. ampliata, E. androsacea, E. arenaria, E. arenicola, E. arvensis, E. barbata, E. bicolor, E. brachystylis, E. breviflora, E. breweri, E. caespitosa, E. calcicola, E. calciphila, E. cardinalis, E. carsonensis, E. charlestonensis, E. chinatiensis, E. cinnabarina, E. corallina, E. cordata, E. decora, E. dentata, E. diffusa, E. discolor, E. eastwoodiae, E. erubescens, E. exigua, E. filicaulis, E. filicifolia, E. floribunda, E. gemmipara, E. geniculata, E. geyeri, E. glaucescens, E. gracilipes, E. grandis, E. grayi, E. guttata, E. hallii, E. hardhamiae, E. hymenophylla, E. inamoena, E. inconspicua, E. inflatula, E. jungermannioides, E. laciniata, E. latidens, E. lewisii, E. linearifolia, E. marmorata, E. michiganensis, E. microphylla, E. minor, E. montioides, E. moschata, E. norrisii, E. nudata, E. palmeri, E. pardalis, E. parishii, E. parvula, E. patula, E. percaulis, E. primuloides, E. ptilota, E. pulsiferae, E. purpurea, E. regni, E. rhodopetra, E. rubella, E. scouleri, E. shevockii, E. sierrae, E. suksdorfii, E. taylorii, E. thermalis, E. tilingii, E. trinitiensis, E. unimaculata, E. utahensis, E. verbenacea, E. washingtonensis, E. willisii
E. acutidens, E. alsinoides, E. ampliata, E. androsacea, E. arenaria, E. arenicola, E. arvensis, E. barbata, E. bicolor, E. brachystylis, E. breviflora, E. breweri, E. caespitosa, E. calcicola, E. calciphila, E. cardinalis, E. carsonensis, E. charlestonensis, E. chinatiensis, E. cinnabarina, E. corallina, E. cordata, E. decora, E. dentata, E. diffusa, E. discolor, E. eastwoodiae, E. erubescens, E. exigua, E. filicaulis, E. filicifolia, E. floribunda, E. gemmipara, E. geniculata, E. geyeri, E. glaucescens, E. gracilipes, E. grandis, E. grayi, E. guttata, E. hallii, E. hardhamiae, E. hymenophylla, E. inamoena, E. inconspicua, E. inflatula, E. jungermannioides, E. laciniata, E. latidens, E. lewisii, E. linearifolia, E. marmorata, E. michiganensis, E. microphylla, E. minor, E. montioides, E. moschata, E. nasuta, E. norrisii, E. nudata, E. palmeri, E. pardalis, E. parishii, E. parvula, E. patula, E. percaulis, E. primuloides, E. ptilota, E. pulsiferae, E. purpurea, E. regni, E. rhodopetra, E. rubella, E. scouleri, E. shevockii, E. sierrae, E. suksdorfii, E. taylorii, E. tilingii, E. trinitiensis, E. unimaculata, E. utahensis, E. verbenacea, E. washingtonensis, E. willisii
Synonyms Mimulus nasuta, M. bakeri, M. cuspidatus, M. erosus, M. guttatus var. gracilis, M. guttatus var. nasutus, M. langsdorffii var. nasutus, M. luteus var. gracilis, M. puncticalyx, M. sookensis, M. subreniformis Mimulus thermalis
Name authority (Greene) G. L. Nesom: Phytoneuron 2012-39: 44. (2012) (A. Nelson) G. L. Nesom: Phytoneuron 2012-39: 44. (2012)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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