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Erythranthe hymenophylla
Erythranthe hymenophylla is a small, delicate perennial herb native to Hells Canyon on the Oregon and Idaho border, with some reports from Montana. It is grown mainly by enthusiasts of native and monkeyflower species, and it needs cool, moist conditions and good drainage to thrive.
Erythranthe hymenophylla, synonym 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. They are lance-shaped to oval with pointed tips and are very thin, nearly membrane-like. Flowers are borne in pairs in the leaf axils. Each has a tube-shaped calyx of green sepals. The corolla is funnel-shaped and variable in size, up to 2.8 centimeters in length. It is yellow with some red or purple dots inside, and it has a beard of yellow hairs on the lower lip.
Wingstem Monkeyflower · Rockjasmine Monkeyflower · Sand Loving Monkeyflower · Bearded Monkeyflower · Yellow And White Monkeyflower · Short Flowered Monkeyflower · Brewer's Monkeyflower · Erythranthe calciphila · Cardinal monkey flower · Carson Valley monkeyflower · Arizona Big Red Monkeyflower · Erythranthe cuprea
Text excerpted from the Wikipedia article Erythranthe hymenophylla by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
