Mimulus hymenophyllus is a species of flowering plant in the lopseed family known by the common names thinsepal monkeyflower and membrane-leaf monkeyflower. It is native to Hells Canyon on the border between Oregon and Idaho in the United States. It has also been reported from Montana.This plant is a perennial herb producing masses of thin, fragile, winged stems up to 25 centimeters long. They are coated in glandular hairs with a slimy exudate. The leaves are oppositely arranged in pairs.
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