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Taxon  Report  
Piperia cooperi  (S. Watson) Rydb.
Cooper's rein orchid,   Coopers rein orchid
Piperia cooperi is a perennial herb that is native to California, and found only slightly beyond California borders.
California Rare Plant Rank: 4.2 (limited distribution).
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial
Observation Search
(163 records)
yellowone or more occurrences
within a 7.5-minute quadrangle

Bloom Period
Genus: Piperia
Family: Orchidaceae  
Category: angiosperm  
PLANTS group:Monocot
Jepson eFlora section: monocot

Name Status:
Accepted by JEF + CNPS + PLANTS

Information about  Piperia cooperi from other sources
Nursery availability from CNPLX
Commercial availability unknown.
Jepson eFlora


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[Wikipedia] Distribution, Description, Conservation: Platanthera cooperi is an uncommon species of orchid known by the common names Cooper's rein orchid and chaparral rein orchid. Distribution The orchid is endemic to chaparral, coastal sage scrub, and oak woodland habitats. It is native to southern California and the border area in Baja California. It is found in the Santa Monica Mountains, Simi Hills, and San Gabriel Mountains of the Transverse Ranges; Santa Catalina Island and San Clemente Island of the Channel Islands, and the Santa Ana Mountains and Cuyamaca Mountains of the Peninsular Ranges.[1] Description Platanthera cooperi grows erect to about 90 centimetres (35 in) in maximum height from a bulbous caudex. The basal leaves are up to 20 centimeters long by 3 cm wide. Leaves higher on the stem are much reduced. The upper part of the stem is a spikelike inflorescence of many small green flowers, which are honey-scented in the evenings. Its bloom period is from March to June. Conservation This orchid is a listed vulnerable species on the California Native Plant Society Inventory of Rare and Endangered Plants.[2] (contributed 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]. 2023. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 11/30/2023).