Erythranthe trinitiensis
Pink margined monkeyflower
(c) Steve Matson, some rights reserved (CC BY), uploaded by Steve Matson · licence
Family: Phrymaceae · Type: Annual · Native
Conservation status: CNPS 1B.3
Erythranthe trinitiensis (Pink margined monkeyflower) is a native California annual in the Phrymaceae family, recognized by pink-bordered corolla lobes diagnostic.
Pink margined monkeyflower is a rare (CNPS 1B.3) California native annual found in clay soils at elevations of 1,300 to 2,000 meters. Flowering from June to August, this plant produces pale yellow to light purplish flowers with distinctive pink-bordered petals. Growing with delicate stems 5 to 15 centimeters tall and minutely puberulent throughout, it forms a small, compact plant. Its leaves are approximately ovate to elliptic-ovate, measuring 6 to 17 millimeters long with petioles 4 to 8 millimeters in length. The flowers feature a yellow tube-throat and pale petals with striking pink margins, creating a delicate and unique appearance.
Identification and appearance
Key characters: Geographically isolated; pink-bordered corolla lobes diagnostic
Habitat and range
Habitat: Moist, generally clay soils in +- full sun
Elevation: 1300-2000 m
Bloom period
Erythranthe trinitiensis blooms Jun-Aug.
Conservation status
CNPS 1B.3
Frequently asked questions
Is Erythranthe trinitiensis native to California?
Yes. Erythranthe trinitiensis is native to California (recorded as native).
When does Erythranthe trinitiensis bloom?
Erythranthe trinitiensis blooms Jun-Aug.
What plant family does Erythranthe trinitiensis belong to?
Erythranthe trinitiensis is in the Phrymaceae family, genus Erythranthe.
Is Erythranthe trinitiensis rare or endangered?
Erythranthe trinitiensis carries California Rare Plant Rank 1B.3, state rank S2.
What habitat does Erythranthe trinitiensis grow in?
Erythranthe trinitiensis grows in Moist, generally clay soils in +- full sun.
Related species
Other California species in the same genus, family, or bioregion.
- Erythranthe utahensis — Utah monkeyflower
- Erythranthe acutidens — Kings river monkeyflower
- Erythranthe alsinoides — Chickweed monkeyflower
- Erythranthe androsacea — Rock-jasmine monkeyflower
- Erythranthe angulosa — sweet-stem monkeyflower
- Erythranthe arenaria — Sand-loving monkeyflower
- Mimetanthe pilosa
- Mimetanthe sp. — Downy mimetanthe
- Mimulus ringens — Allegheny monkeyflower
Sources: Jepson eFlora · CDFW CNDDB
Last updated 2026-09-30
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Cal-IPC, and more.