Flora of North America species comparison

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Erythranthe rubella

Erythranthe linearifolia

little redstem monkeyflower, red stem himulus, redstem monkeyflower, redstem or little redstem monkeyflower

primrose monkeyflower, threadleaf primrose monkeyflower
Habit Annuals, taprooted. Perennials, rhizomatous, densely cespitose, forming large patches and turfs 0.3–1 m diam.
Stems

erect, simple, sometimes branched from basal nodes, 3–32 cm, minutely puberulent.

erect to ascending, simple, 2–10 cm, sparsely hirsute and stipitate-glandular, internodes shortened.
Leaves

cauline, basal not persistent;

petiole 0 mm;

blade palmately 3-veined (in broader ones), linear to elliptic, 5–22(–30) × 1–5 mm, base narrowed, margins entire, sometimes toothed, apex acute to obtuse, surfaces minutely puberulent.

basal or near basal, sometimes proximal cauline, subrosulate;

petiole 0 mm;

blade 1-veined or palmately 3-veined, linear to narrowly oblanceolate, 15–50 × 1.5–5 mm, base long-cuneate, often subclasping, margins entire, dentate-serrate, or distally dentate, apex acute, surfaces glabrous or adaxial sparsely short-pilose, eglandular.
Flowers

herkogamous, sometimes plesiogamous, 1–106, from distal or medial to distal nodes.

herkogamous, 1.
Styles

glabrous.

glabrous.
Corollas

yellow and abaxial limb and throat red dotted or pink to purple and throat yellow, bilaterally symmetric, weakly bilabiate;

tube-throat cylindric, 4–10 mm, exserted beyond calyx margin;

limb expanded 3–5 mm, lobes entire or weakly notched, abaxial limb glabrous.

yellow, red-spotted or -striped, bilaterally symmetric, weakly bilabiate, loosely hirsute on abaxial side of opening;

tube-throat narrowly campanulate, 18–22 mm, exserted beyond calyx margin;

lobes broadly obovate-oblong, apex rounded- or truncate-notched, throat open.
Fruiting pedicels

2–18 mm.

(40–)65–85(–120) mm, glabrous or sparsely stipitate-glandular near base.
Fruiting calyces

becoming red-angled or red, campanulate to nearly cylindric, 4–9 mm, margins distinctly toothed or lobed, glabrous or minutely puberulent, ribs thickened, lobes pronounced, erect, margins ciliate.

winged- or plicate-angled, tubular-campanulate, weakly or not inflated, 9–10(–12) mm, glabrous.
Capsules

included, 3–8 mm.

included, 6–7 mm.
Anthers

included, glabrous.

included or slightly exserted, margins ciliate, glabrous.

Erythranthe rubella

Erythranthe linearifolia
Phenology Flowering Apr–Jun. Flowering Jul–Sep.
Habitat Open slopes and washes. Wet banks, Darlingtonia seeps and bogs, seepages in serpentine talus.
Elevation 300–3000 m. [1000–9800 ft.] 600–2800 m. [2000–9200 ft.]
Distribution
from FNA
AZ; CA; CO; NM; NV; TX; UT; WY; Mexico (Baja California, Sonora)
[WildflowerSearch map]
from FNA
CA
[WildflowerSearch map]
Discussion

Erythranthe linearifolia is endemic to serpentine substrates in Shasta, Siskiyou, and Trinity counties; typical E. primuloides occurs in the same area but not on serpentine. Erythranthe linearifolia is distinct from E. primuloides especially in its narrow leaves and cespitose habit. A collection from Tulare County appears to be E. linearifolia (Shevock 10597, CAS), but this appears to be far out of range and the voucher should be reexamined; it probably is better identified as an unusual collection of E. primuloides.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 384. Treatment authors: Guy L. Nesom, Naomi S. Fraga. FNA vol. 17, p. 390. Treatment authors: Guy L. Nesom, Naomi S. Fraga.
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. 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. 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. veronicifolia
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. 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. veronicifolia
Synonyms Mimulus rubellus, M. gratioloides Mimulus primuloides var. linearifolius, M. linearifolius, M. primuloides subsp. linearifolius
Name authority (A. Gray) N. S. Fraga: Phytoneuron 2012-39: 35. (2012) (A. L. Grant) G. L. Nesom & N. S. Fraga: Phytoneuron 2012-39: 35. (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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