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Triantha occidentalis  (S. Watson) R. R. Gates
Western false asphodel
© 2004 Steve Matson
© 2006 Steve Matson
© 2022 Dana York
© 2021 Julie A. Kierstead
© 2022 Mary Ann Machi
© 2018 Glenn Fine
© 2023 Ken-ichi Ueda
© 2022 Mary Ann Machi
© 2018 Matt Berger
© 2021 Jamie Spielmann
© 2021 Jamie Spielmann
© 2021 Jamie Spielmann
© 2021 Jamie Spielmann
© 2021 Julie A. Kierstead
© 2020 Bob Sweatt
© 2020 Bob Sweatt
© 2019 Julie Kierstead Nelson
Triantha occidentalis is a perennial herb that is native to California.
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Bloom Period
Subspecies and Varieties:
Genus: Triantha
Family: Tofieldiaceae  
(Liliaceae)
Category: angiosperm  
PLANTS group:Monocot
Jepson eFlora section: monocot

Wetlands: Occurs usually in wetlands, occasionally in non wetlands
Name Status:
Accepted by PLANTS + POWO

Alternate Names:
OTHERTofieldia occidentalis
Information about  Triantha occidentalis from other sources
Nursery availability from CNPLX
Commercial availability unknown.
USDA PLANTS Profile (TROC7)

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[Wikipedia] History, Carnivory, Range: Botanical history Triantha occidentalis was described by Sereno Watson in 1879 as Tofieldia occidentalis, and reassigned to Triantha by R. R. Gates in 1918.[3][4] The carnivorous behavior of the plant was discovered in 2021 by a group of scientists from the University of British Columbia and the University of Wisconsin–Madison.[5][6] Range The native range of Triantha occidentalis is from Southeast Alaska to Central California. The range includes the US states of Alaska, California, Idaho, Montana, Oregon, Washington, and Wyoming and the Canadian provinces of Alberta and British Columbia.[1] Carnivory Triantha occidentalis is a carnivorous plant; the flower stems are covered in a sticky substance, and have tiny hairs that produce a digestive enzyme, a phosphatase. The sticky substance is able to trap small insects, which are digested by the enzyme from the hairs, allowing the plant to absorb their nutrients.[7][5] Other carnivorous plants have insect traps well away from flowers, in positions where pollinating insect such as bees and butterflies are not affected; T. occidentalis's sticky flower stems are only able to trap smaller insects such as fruit flies.[5][8] It was not suspected that T. occidentalis, which grows near urban centers, was carnivorous until it was found to have a genetic deletion sometimes seen in carnivorous plants, prompting investigation. The plant is, as of 2021, the only one known to trap insects this unsuspected way, but it has been suggested that there may be more.[7][8] (link added by Mary Ann Machi)


Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2025. The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 03/28/2025).