Erythranthe cuprea is a species of monkeyflower also known by the common name flor de cobre (Eng: copper flower). It was formerly known as Mimulus cupreus. Its characteristics in nectar and petal shape are markedly different from other species in this genus found in Chile.

Distribution: Erythranthe cuprea is endemic to central and southern Chile with wet locales such as riverbanks. Several commercial cultivars are available: ´Fire Dragon´, ´Fire King´, ´Highland Red´, ´Inshriach Crimson´, ´Plymtree´, ´Red Emperor´, ´Scarlet Bay´, ´Scarlet Bee´, ´Whitecroft Scarlet´ and ´Wisley Red´. Many of these cultivars are hybrids with Erythranthe lutea or Erythranthe guttata.

 Similar to E. lutea but of a short life span, Erythranthe cuprea has atypical flower coloring, being coppery-orange to coppery-red, whereas most monkey-flowers are yellow or red, though occasional yellow morphs are found. This does not affect pollination by bees and E. cuprea possesses a high degree of self-pollination. Leaves have teeth and are oval. The plant grows to about in height and flowers are 4 cm in length. Flowering occurs in the summer.

Phytochemistry: Petal-color polymorphism is controlled by a single locus; petal and dorsal coloring is co-inherited, indicating single or linked control. The red-copper color of the flowers is caused by a water-soluble pigment, cyanidin, which is an anthocyanin, acquired through a gain-of-function mutation. An unusual feature is that a similar mutation in a different gene has occurred in E. lutea, but "the loci are related through duplication."

Cultivation: This short-lived perennial is cultivated as an ornamental, and is often treated as an annual. In the horticultural literature it is still referred to as Mimulus cupreus. The cultivar ´Whitecroft Scarlet´ has gained the Royal Horticultural Society´s Award of Garden Merit. It requires a sheltered spot in reliably moist soil, preferring partial shade.