Flora of North America species comparison

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Erythranthe rubella

Erythranthe cardinalis

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

cardinal monkey flower, scarlet monkey-flower
Habit Annuals, taprooted. Perennials, rhizomatous.
Stems

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

usually erect to ascending, freely branched, 25–75 cm, ± glandular-villous or glabrate.
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.

usually cauline;

petiole 0 mm;

blade palmately veined, elliptic-ovate to ovate or obovate, 20–90(–110) × 10–38(–60) mm, thick, base acuminate, subclasping, margins irregularly serrate to dentate, apex acute, surfaces ± glandular-villous to glabrate.
Flowers

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

herkogamous, 2–12, axillary at leafy medial to distal nodes.
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.

scarlet to orange-red, rarely yellow, throat yellowish, red-striped, palate red, yellow-villous, not spotted or striped, bilaterally symmetric, strongly bilabiate;

tube-throat funnelform, (15–)20–30 mm, exserted beyond calyx margin;

throat open.
Fruiting pedicels

2–18 mm.

30–90(–120) mm.
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.

cylindric to cylindric-campanulate, not inflated, 17–28(–30) mm, hispid-hirsute to hirsute, lobes 4–7 mm, ovate to ovate-deltate, apex attenuate-acute.
Capsules

included, 3–8 mm.

included, 10–16 mm.
Anthers

included, glabrous.

exserted, white-villous, thecae spreading.
2n

= 16.

Erythranthe rubella

Erythranthe cardinalis
Phenology Flowering Apr–Jun. Flowering May–Sep.
Habitat Open slopes and washes. Moist to wet places along streams, lakes, creek beds, canyon, arroyo, and ravine bottoms, around springs and seepage areas, flood plains, moist clearings and woods edges.
Elevation 300–3000 m. [1000–9800 ft.] (5–)50–2300(–2800) m. [(20–)160–7500(–9200) ft.]
Distribution
from FNA
AZ; CA; CO; NM; NV; TX; UT; WY; Mexico (Baja California, Sonora)
[WildflowerSearch map]
from FNA
CA; NV; OR; WA; Mexico (Baja California)
[WildflowerSearch map]
Discussion

Yellow-flowered populations of Erythranthe cardinalis occur on Cedros Island, Baja California, and in the Siskiyou Mountains of Oregon (R. K. Vickery 1992). They have been documented also on Santa Cruz Island, California.

Populations of Erythranthe cardinalis in King and Yakima counties, Washington, are introduced and naturalized.

(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. 393. 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. 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, E. veronicifolia
Synonyms Mimulus rubellus, M. gratioloides Mimulus cardinalis, M. cardinalis var. exsul, M. cardinalis var. griseus, M. cardinalis var. rigens
Name authority (A. Gray) N. S. Fraga: Phytoneuron 2012-39: 35. (2012) (Douglas ex Bentham) Spach: Hist. Nat. Vég. 9: 313. (1840)
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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