Platanthera cooperi

 ( Cooperi ) 

Platanthera cooperi is an uncommon species of Orchidaceae known by the common names Cooper's rein orchid and chaparral rein orchid.

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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. Calflora Distribution map of Piperia cooperi

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Description Platanthera cooperi grows erect to about 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.

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Conservation This orchid is a listed vulnerable species on the California Native Plant Society Inventory of Rare and Endangered Plants. California Native Plant Society Inventory of Rare and Endangered Plants (online edition, v8-02) . accessed 23 January 2016.

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External links

• Calflora Database: Piperia cooperi (Cooper's rein orchid)
• Jepson Manual eFlora (TJM2) treatment of Piperia cooperi
• USDA Plants Profile for Piperia cooperi
• Flora of North America
• UC Photos gallery — Piperia cooperi

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