Flora of North America species comparison

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Erythranthe linearifolia

Erythranthe charlestonensis

primrose monkeyflower, threadleaf primrose monkeyflower

Charleston Mountains monkeyflower
Habit Perennials, rhizomatous, densely cespitose, forming large patches and turfs 0.3–1 m diam. Annuals, fibrous-rooted, usually dark purplish.
Stems

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

erect, simple, weakly 4-angled, 4–16(–24) cm, slender, glabrous or sparsely villous-glandular near nodes.
Leaves

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.

basal and cauline, basal usually persistent, largest at mid stem or above, cauline relatively few on long internodes;

petiole: proximals to distals 1–4 mm;

blade palmately 3-veined, ovate to ovate-lanceolate, 5–16(–20) × 3–11 mm, base truncate to subcordate, margins shallowly, evenly crenulate to serrate-dentate or denticulate, apex acute to obtuse, surfaces: proximals glabrous or sparsely villous, distals and bracteals sparsely hirtellous or glabrous abaxially or along distal margin, sparsely villous adaxially, hairs vitreous, flattened, eglandular.
Flowers

herkogamous, 1.

plesiogamous, (1–)4–7, usually from all nodes, usually beginning about mid stem, cleistogamous.
Styles

glabrous.

glabrous.
Corollas

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.

yellow, sparsely red-dotted, bilaterally or nearly radially symmetric, bilabiate or nearly regular;

tube-throat narrowly cylindric, 4–6 mm, exserted 0.5–1 mm beyond calyx margin;

limb barely expanded.
Fruiting pedicels

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

deflexed 45–90º at calyx, 6–19 mm, longer than subtending leaves, glabrous or sparsely villous-glandular.
Fruiting calyces

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

sometimes purple-dotted, broadly elliptic-ovoid, inflated, sagittally compressed, 10–13 mm, minutely hirtellous, sometimes also sparsely glandular, throat closing, adaxial lobe not distinctly longer than abaxial, not falcate.
Capsules

included, 6–7 mm.

included, stipitate, 6–8 mm.
Anthers

included or slightly exserted, margins ciliate, glabrous.

included, glabrous.

Erythranthe linearifolia

Erythranthe charlestonensis
Phenology Flowering Jul–Sep. Flowering Apr–Jul(–Aug).
Habitat Wet banks, Darlingtonia seeps and bogs, seepages in serpentine talus. Grassy slopes, damp soils, moist rocks.
Elevation 600–2800 m. (2000–9200 ft.) (900–)1700–2400(–2800) m. ((3000–)5600–7900(–9200) ft.)
Distribution
from FNA
CA
[WildflowerSearch map]
from FNA
AZ; NV
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.)

Erythranthe charlestonensis is characterized by its annual duration, autogamous reproduction, small stature, commonly purplish color, regularly ovate, short-petiolate leaves with shallowly crenate margins and (distal leaves) sparsely villous or glabrous adaxial surfaces, hirtellous calyces without a prominently longer adaxial lobe, and lack of glandular hairs. It is endemic to the Charleston (Spring) Mountains of Clark County, Nevada, and one locality (Union Pass) in Mohave County, Arizona.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 390. FNA vol. 17, p. 423.
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. 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. 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. 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 primuloides var. linearifolius, M. linearifolius, M. primuloides subsp. linearifolius
Name authority (A. L. Grant) G. L. Nesom & N. S. Fraga: Phytoneuron 2012-39: 35. (2012) G. L. Nesom: Phytoneuron 2012-40: 80. (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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