Key for Differentiating Several Diplacus Species of Central Oregon
Cascade Monkeyflower: Diplacus cascadensis (Synonyms: Mimulus nanus, Mimulus nanus ssp. cascadensis) -
Bank Monkeyflower, Bank Monkey Flower: Diplacus clivicola (Synonym: Mimulus clivicola) - Annual from 5-20 cm tall. Leaves 3-nerved. Corolla tube yellowish with purple lobes, the throat pinkish or yellow with red spots. Corolla is 1.5-2 cm long. Calyx 7-10 mm long with sharp teeth.
Cusick's Monkeyflower, Cusick's Monkey-flower, Cusick's Monkey Flower: Diplacus cusickii (Synonyms: Eunanus cusickii, Mimulus cusickii) - Annual from 2-30 cm high. Corolla from 20-30 cm long, magenta to violet with 2 yellow patches in throat. Calyx 8-12 mm long with unequal lobes. Herbage densely glandular-pubescent.
Nesom's Monkeyflower: Diplacus cusickioides (Synonym: Mimulus cusickii) -
Deschutes Monkeyflower: Diplacus deschutesensis (Synonym: Mimulus cusickii - in part) -
Jepson's Monkeyflower: Diplacus jepsonii (Synonyms: Mimulus jepsonii, Mimulus nanus var. jepsonii) -
Dwarf Monkeyflower, Dwarf Purple Monkeyflower, Dwarf Purple Monkey Flower: Diplacus nanus (Synonyms: Mimulus nanus, Mimulus nanus ssp. nanus, Mimulus nanus var. nanus)- Annual with branched stems from 1-12 cm high. Leaves on stems linear to oblanceolate from 1-3.5 cm long. Flowers purplish with yellow center and reddish spots around yellow. The calyx is 5-9 mm long, the lobes roughly equal.
Pygmy Monkeyflower: Diplacus pygmaeus (Synonym: Mimulus pygmaeus) -
Tricolored Monkeyflower: Diplacus tricolor (Synonym: Mimulus tricolor) -
Chickweed Monkeyflower, Chickweed Monkey-flower, Chickweed Monkey Flower, Wingstem Monkeyflower, Wing-stem Monkey-flower: Erythranthe alsinoides (Synonyms: Mimulus alsinoides) -
Field Monkeyflower: Erythranthe arvensis (Synonyms: Mimulus guttatus, Mimulus guttatus var. arvensis, Mimulus longulus) -
Shortflower Monkeyflower, Short-flowered Monkeyflower, Short-flowered Monkey Flower: Erythranthe breviflora (Synonyms: Mimulus breviflorus, Mimulus breviflorus ssp. breviflorus, Mimulus breviflorus ssp. robustus, Mimulus inflatulus) - Annual from 3-20 cm tall. Often much branched. Corolla yellow, 4-7 mm long. Calyx with short, acute teeth.
Brewer's Monkeyflower, Brewer's Monkey-flower: Erythranthe breweri (Synonyms: Mimulus breweri, Mimulus rubellus var. breweri) - Annual from 3-18 cm high, often reddish in color. Corolla light purple to red, or tube white with magenta at the base, 5-10 mm long. Corolla lobes rounded or notched at the tips. Calyx 3-7 mm long with short, acute teeth.
Cardinal Monkeyflower, Scarlet Monkeyflower, Scarlet Monkey-flower: Erythranthe cardinalis (Synonyms: Diplacus cardinalis, Mimulus cardinalis) - Introduced species east of the Cascades in Washington.
Many-flowered Monkey-flower, Purple-stem Monkey Flower, Purple-stemmed Monkeyflower: Erythranthe floribunda (Synonyms: Mimulus deltoides, Mimulus floribundus, Mimulus geniculatus, Mimulus membranaceus, Mimulus multiflorus, Mimulus pubescens, Mimulus serotinus, Mimulus subulatus, Mimulus trisulcatus) - Annual from 5-50 cm tall. Corolla yellow, often streaked with red or with red dots. Corolla is 7-15 mm long. Calyx 4-8 mm long with acute teeth.
Large Monkeyflower: Erythranthe grandis (Synonyms: Mimulus guttatus, Mimulus guttatus ssp. litoralis, Mimulus guttatus var. gracilis, Mimulus guttatus var. grandis) -
Common Monkeyflower, Common Monkey Flower, Seep Monkeyflower, Seep Monkey-flower, Yellow Monkey Flower: Erythranthe guttata (Synonyms: Mimulus guttatus, Mimulus guttatus ssp. guttatus, Mimulus guttatus var. guttatus, Mimulus guttatus var. lyratus, Mimulus guttatus var. puberulus, Mimulus lyratus, Mimulus langsdorffii) - Annual or perennial from 10-100 cm high. Flowers strongly 2-lipped, the corolla from 1-4 cm long. Flowers usually number more than 5 at the ends of the stems. The corolla is yellow with many hairs in the throat and red to brownish spots on the palate. Calyx up to 2 cm long, the upper the longest, the others curving inward. Plants of low to middle elevations. Similar to Mimulus tilingii.
Thinsepal Monkeyflower: Erythranthe hymenophylla (Synonym: Mimulus hymenophyllus) -
Disappearing Monkeyflower, Ephemeral Monkey Flower: Erythranthe inflatula (Synonym: Mimulus evanescens) - Annual. Leaves broadly lanceolate to ovate. Corolla yellow and less than 8 mm long.
Columbia Monkeyflower, Jungermann's Monkeyflower, Liverwort Monkeyflower: Erythranthe jungermannioides (Synonym: Mimulus jungermannioides) - Perennial with weak to prostrate stems from 5-30 cm long. Corolla yellow with red spots in throat, from 13-18 mm long, 2-lipped. Calyx 6-7 mm long with broad, short lobes with a small point at the tip. Stem leaves petiolate, the blades ovate to hear-shaped.
Broad-toothed Monkeyflower: Erythranthe latidens (Synonym: Mimulus latidens) -
Lewis' Monkey Flower, Great Purple Monkey Flower, Purple Monkey-flower: Erythranthe lewisii (Synonym: Mimulus lewisii) - Perennial from 30-90 cm high. Corolla pinkish-purple, 3-5 cm long with yellowish throat and purple spots. Calyx 2-3 cm long with narrow teeth, roughly equal in length. Plants of medium to high elevation.
Small-leaf Monkeyflower: Erythranthe microphylla (Synonyms: Mimulus guttatus, Mimulus guttatus var. depauperatus, Mimulus guttatus var. laxus, Mimulus guttatus var. microphyllus, Mimulus laxus, Mimulus microphyllus) -
Musk Monkeyflower, Musk-flower Monkeyflower, Musk-flowered Monkey Flower, Sticky Monkey-flower: Erythranthe moschata (Synonyms: Mimulus moschatus, Mimulus moschatus var. moschatus, Mimulus moschatus var. pallidiflorus, Mimulus moschatus var. sessilifolius) - Plants perennial with weak, sometimes prostrate stems from 5-40 cm long. Leaves ovate to elliptic ovate, 1-5 cm long. Stems and leaves covered with gland-tipped, whitish hairs. Herbage feels slimy and may smell musky. Leaves pinnately veined and stem leaves petiolate. Flowers yellow with dark lines or spots. Calyx 7-13 mm long, the upper lobe slightly longer than the others.
Large-nose Monkeyflower: Erythranthe nasuta (Synonyms: Mimulus guttatus, Mimulus guttatus var. nasutus, Mimulus nasutus, Mimulus puncticalyx, Mimulus sookensis) -
Stalk-leaved Monkeyflower: Erythranthe patula (Synonym: Mimulus patulus ssp. patulus, Mimulus patulus var. patulus, Mimulus patula) -
Primrose Monkeyflower, Primrose Monkey-flower, Primrose Monkey Flower: Erythranthe primuloides (Synonyms: Mimulus pilosellus, Mimulus primuloides, Mimulus primuloides var. minimus, Mimulus primuloides var. pilosellus, Mimulus primuloides ssp. primuloides, Mimulus primuloides var. primuloides) - Perennial. Leaves all basal and 3-veined. Leaves elliptic-oblanceolate. Yellow flowers solitary on leafless stems, each 5-20 mm long. The corolla lobes spread and are all notched. The calyx is 4-8 mm long, the lobes acute roughly equal.
Candelabrum Monkey-flower, Pulsifer's Monkeyflower, Pulsifer's Monkey-flower: Erythranthe pulsiferae (Synonym: Mimulus pulsiferae) -
Suksdorf's Monkeyflower, Miniature Monkey-flower: Erythranthe suksdorfii (Synonym: Mimulus suksdorfii) - Annual from 1-7 cm high, often branched. Herbage with glandular hairs. Leaves on the stems, linear to lanceolate, 5-16 mm long and 1-3 mm wide. Yellow corolla 4-6.5 mm long, weakly 2-lipped. Calyx 3-5 mm long, reddish, the lobes subequal.
Large Mountain Monkey Flower, Large Mountain Monkey-flower, Tiling's Monkeyflower, Tiling's Monkey-flower: Erythranthe tilingii (Synonyms: Mimulus implexus, Mimulus tilingii, Mimulus tilingii var. tilingii) - Perennial with stems from 5-30 cm tall. Herbage glabrous. Leaves 1- 3 cm long, ovate to elliptic in shape. Flowers 1-5 at the ends of the stems. Yellow corolla is 2-4 cm long with hairy palate. Calyx 1.4-2 cm long with the large upper tooth longer than the others. Plants of high elevation. Similar to Mimulus guttatus.
Washington Monkeyflower: Erythranthe washingtonensis (Synonyms: Mimulus patulus ssp. montanus, Mimulus washingtonensis var. ampliatus, Mimulus washingtonensis var. washingtonensis) - Slender annual from 4-20 cm high, simple to branched. Herbage glandular haired. Corolla yellow with red-brown spots, 1-2 cm long. Corolla is strongly 2-lipped, the lower longer and flexed downward. Calyx 4.5-8 mm long, the short teeth roughly equal.
Hairy Monkey Flower: Mimulus pilosus (now Mimetanthe pilosa) - A branched annual from 5-25 cm high. Herbage finely glandular haired. Leaves oblanceolate to narrowly elliptic, 1.5-4 cm long with 1-3 weak veins. Corolla yellow with 2 red-brown spots on lower lip, 6.5-9 mm long. Calyx 5-7.5 mm long, the lobes unequal. .