Erythranthe rubella is a species of monkeyflower known by the common name little redstem monkeyflower. It was formerly known as Mimulus rubellus.[1] [2] [3]
It is native to western North America, including the southwestern United States to Wyoming and Texas, and into Baja California.
Erythranthe rubellus is an annual herb growing 2 to 32 centimeters tall with a very slender, red stem. The oppositely arranged oval leaves are up to 3 centimeters long and lance-shaped to oval, the lower ones borne on short petioles. The herbage is usually lightly hairy and green to reddish in color.
The petite tubular flower is no more than a centimeter long, the base of its tube encapsulated in a narrow, ribbed calyx of sepals. The flower may be yellow or pink in color and the mouth of the flower is usually dotted with red or purple.