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Taxon  Report  
Piperia transversa  Suksd.
Mountain piperia,   Royal rein orchid,   Flat Spurred Piperia
Piperia transversa is a perennial herb that is native to California.
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

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

Communities: Northern Coastal Scrub, Closed-cone Pine Forest, Yellow Pine Forest, Red Fir Forest, Foothill Woodland, Chaparral
Name Status:
Accepted by JEF + PLANTS

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


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[https://goorchids.northamericanorchidcenter.org/] Description, Ecosystem, Characteristics, Pollination: Accepted Synonym: Piperia transversa. Platanthera transversa, the Flat Spurred Piperia, is widely distributed throughout California and extends northward into British Columbia. This orchid has a pair of basal leaves that emerge early in the spring but wither by the time of flowering. The inflorescence consists of numerous white to yellow flowers with green midveins on the sepals and petals and are fragrant at night. This orchid can be recognized by its slightly flattened horizontal spur more than twice as long as the labellum. P. transversa generally prefers dry sites, including scrub and oak woodlands or conifer forests. Platanthera transversa is apparently secure across its range with many sites occurring in protected parks and reserves. Pollination This orchid is pollinated by the moths in Geometridae such as Thallophaga taylorata with pollinaria attached to the proboscis. Ecosystem Type Forests, shrublands or thickets, woodlands Characteristics HABITAT:terrestrial LEAF ARRANGEMENT:basal NUMBER OF LEAVES ON STEM:two FORM OF THE LABELLUM:the labellum is not pouch-like LABELLUM OUTLINE:the labellum is simple MAIN COLOR OF LABELLUM: white, yellow NECTAR SPUR:present INFLORESCENCE TYPE:the inflorescence is a spike LABELLUM CHARACTERISTICS:the labellum is simple LABELLUM LENGTH:2.2 to 5.3 mm SEPAL LENGTH:2.5 to 4.5 mm PLANT HEIGHT:12 to 57 cm (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: 12/11/2023).