Flora of North America species comparison

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Erythranthe exigua

Erythranthe arenaria

eye strain monkeyflower, San Bernardino Mountains monkeyflower

sand-loving monkeyflower
Habit Annuals, taprooted. Annuals, fibrous-rooted or filiform-taprooted.
Stems

erect, simple, sometimes branched near base, 2–10 cm, minutely stipitate-glandular.

erect to ascending, straight or geniculate at nodes, simple or branched, 5–20 cm, villous-glandular, hairs 0.2–0.8 mm, gland-tipped.
Leaves

cauline;

petiole 0 mm;

blade 1-veined, obovate-oblong to narrowly elliptic, ovate, or narrowly ovate, 3–6 mm, base rounded to truncate or cuneate, margins entire or shallowly dentate, apex rounded, surfaces minutely stipitate-glandular.

basal and cauline;

petiole 0 mm or proximals 1–3(–5) mm;

blade 1-veined or palmately 3-veined, elliptic to narrowly elliptic, ovate-elliptic, or ovate-lanceolate, 5–12(–17) × 3–7 mm, base rounded to cuneate-attenuate, margins entire or sparsely dentate to serrate, apex acuminate to acute or obtuse, surfaces villous-glandular, hairs 0.2–0.8 mm, gland-tipped.
Flowers

plesiogamous, (1 or)2–6, from distal or medial to distal nodes.

herkogamous, 1–22, from proximal to distal nodes.
Styles

glabrous.

glabrous.
Corollas

light lavender to purple, abaxial lobe and palate ridges with yellow patches, bilaterally symmetric, ± bilabiate;

tube-throat narrowly funnelform-cylindric, 1.5–2.5 mm, exserted 0.5 mm beyond calyx margin;

lobes spreading.

yellow, abaxial limb red-dotted, bilaterally symmetric, weakly bilabiate;

tube-throat funnelform, 9–12(–14) mm, exserted beyond calyx margin;

lobes broadly obovate, apex rounded.
Fruiting pedicels

divergent-spreading, 15–20 mm, minutely stipitate-glandular.

divergent-arcuate, 10–23 mm, villous-glandular, hairs 0.2–0.8 mm, gland-tipped.
Fruiting calyces

campanulate, 2–2.5 mm, minutely stipitate-glandular.

usually red-dotted, narrowly campanulate, not or weakly inflated, 5–7(–9) mm, margins distinctly toothed or lobed, villous-glandular, ribs angled, lobes pronounced, erect.
Capsules

distinctly exserted, 3–4 mm.

included, 4–7 mm.
Stigmas

persistent in fruit.

Anthers

included, glabrous.

included, glabrous.
2n

= 32.

Erythranthe exigua

Erythranthe arenaria
Phenology Flowering Jun–Jul. Flowering May–Sep.
Habitat Gentle slopes, along small streams, vernal creeks, pebble plains, openings in Jeffrey pine-juniper forests, runoff areas, vernal depressions, roadsides. Sandy flats, bars, gullies, washes, trails, roadcuts, seasonal creek beds and drainages, rocky slopes, seepy loam, ditches, lake edges, meadows, openings in pine-fir and pine-oak woodlands.
Elevation 1800–2400(–2600) m. (5900–7900(–8500) ft.) (100–)500–2600(–2800) m. ((300–)1600–8500(–9200) ft.)
Distribution
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
from FNA
CA
[WildflowerSearch map]
Discussion

Plants of Erythranthe exigua are diminutive annuals with few nodes and greatly reduced leaves, corollas, and calyces, wide spreading pedicels, and lavender flowers with small but bilabiate limbs. The species is known only from the San Bernardino Mountains of San Bernardino County and in adjacent Mexico.

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

Erythranthe arenaria is known from a cluster of six counties of the central Sierra Nevada: Fresno, Madera, Mariposa, Merced, Tulare, and Tuolumne.

Most plants of Erythranthe arenaria have relatively even-sized cauline leaves, all sessile to proximally subsessile. Plants in the Yosemite area with persistent basal leaves that are short-petiolate, ovate with a cuneate base, and relatively larger than the more distal cauline ones, and possibly related to E. arenaria, have been named M. floribundus var. subulatus. These might be construed as showing the influence of E. geniculata, but that species occurs only at the lower range of elevation of E. arenaria, while plants referable to Mimulus floribundus var. subulatus occur at least to 2300 m and also have the erect habit characteristic of E. arenaria. These variants should be investigated, especially in the Yosemite area where they appear to be relatively common, with the possibility that they indeed represent a distinct entity.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 406. FNA vol. 17, p. 403.
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. 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. thermalis, E. tilingii, E. trinitiensis, E. unimaculata, E. utahensis, E. verbenacea, E. washingtonensis, E. willisii
E. acutidens, E. alsinoides, E. ampliata, E. androsacea, 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. thermalis, E. tilingii, E. trinitiensis, E. unimaculata, E. utahensis, E. verbenacea, E. washingtonensis, E. willisii
Synonyms Mimulus exiguus Mimulus arenarius, M. floribundus var. subulatus, M. multiflorus, M. subulatus, M. trisulcatus
Name authority (A. Gray) G. L. Nesom & N. S. Fraga: Phytoneuron 2012-39: 42. (2012) (A. L. Grant) G. L. Nesom: Phytoneuron 2012-39: 38. (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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