Mimulus 'Highland Yellow' is a herbaceous perennial in the Phrymaceae that forms upright, clump-forming, spreading plants suited to very moist ground. It is deciduous and flowers from June to September. Place it in full sun or partial shade on south-, east- or west-facing sites that are sheltered. It performs best where soil remains consistently moist.

Mimulus 'Highland Yellow' is a deciduous herbaceous perennial for moist, sheltered sites that flowers from June to September.

Mimulus, also known as monkeyflowers, is a plant genus in the family Phrymaceae, which was traditionally placed in family Scrophulariaceae. The genus now contains only seven species, two native to eastern North America and the other five native to Asia, Australia, Africa, or Madagascar.

Mimulus 'Highland Yellow'

Monkeyflower | Mimulus 'Highland Yellow'

Mimulus aurantiacus is a subshrub in the Phrymaceae that suits exposed, well-drained sites. It naturally comes from western USA and is used where dry, sandy or rocky soils limit other planting. Plant in full sun or partial shade and keep to dry-to-medium soil moisture. Flowers appear from June to September, providing a summer display.

Bush monkey flower (Mimulus aurantiacus) is a sun-tolerant subshrub for well-drained, sandy or rocky spots, flowering June to September.

https://en.wikipedia.org/wiki/Diplacus_aurantiacus

Diplacus is a genus of flowering plants in the family Phrymaceae, which was traditionally placed in family Scrophulariaceae. It includes 49 species native to the western United States and northwestern Mexico.

Mimulus aurantiacus

Bush monkey flower | Mimulus aurantiacus

Mimulus cardinalis is a perennial with nectar-rich, strongly reflexed red to orange-red flowers, occasionally found in yellow in the wild. It favours moist, well-drained soil and will grow in full sun or partial shade. Flowering runs from June to September. Leaves are toothed and often downy to the touch.

Scarlet monkey flower Mimulus cardinalis blooms June to September and suits moist borders, pond edges and naturalised areas.

https://en.wikipedia.org/wiki/Erythranthe_cardinalis

Erythranthe, the monkey-flowers and musk-flowers, is a diverse plant genus with more than 120 members in the family Phrymaceae. Erythranthe was originally described as a separate genus, then generally regarded as a section within the genus Mimulus, and recently returned to generic rank.

Mimulus cardinalis

Scarlet monkey flower | Mimulus cardinalis

Mimulus cardinalis 'Rose Queen' is a perennial in the Phrymaceae with a long summer flowering season from June to September. It originates from western North America and performs best where the soil remains moist. Position it in full sun to partial shade in moist, well-drained ground. Expect season-long interest from its repeated blooms through the summer months.

Scarlet Monkeyflower Mimulus cardinalis 'Rose Queen' is a perennial for moist, well-drained soils that flowers June to September.

Mimulus cardinalis 'Rose Queen'

Scarlet Monkeyflower | Mimulus cardinalis 'Rose Queen'

Mimulus guttatus is a perennial herb that bears yellow tubular flowers from June to September. It typically reaches about 0.6 m in height and favours moist conditions. Plant in full sun where soil is sandy, loamy or clay but remains moist or wet. It is fully hardy in UK gardens (H7).

Monkey flower (Mimulus guttatus) bears yellow blooms June to September and suits moist, sunny sites in UK gardens.

https://en.wikipedia.org/wiki/Erythranthe_guttata

Mimulus guttatus

Monkey flower | Mimulus guttatus

Mimulus lewisii is a perennial herb notable for its pale-pink to dark-magenta flowers with yellow nectar guides. It reaches about 0.6 m and prefers full sun on reliably moist to wet ground. Flowering runs from June to September. Fully hardy in the UK (H7).

Great purple monkey flower (Mimulus lewisii) produces pale-pink to dark-magenta blooms from June to September and suits moist, sunny spots in UK gardens.