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Plant Database

Search for native plants by scientific name, common name or family. If you are not sure what you are looking for, try the Combination Search or our Recommended Species lists.

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Cypripedium arietinum (Ram's head lady's slipper)
Bransford, W.D. and Dolphia

Cypripedium arietinum

Cypripedium arietinum W.T. Aiton

Ram's Head Lady's Slipper

Orchidaceae (Orchid Family)

Synonym(s): Criosanthes arietina

USDA Symbol: cyar5

USDA Native Status: L48 (N), CAN (N)


From the Image Gallery

7 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
Root Type: Fibrous
Leaf Complexity: Simple
Leaf Shape: Lanceolate , Ovate

Bloom Information

Bloom Color: White , Red , Green , Purple , Brown
Bloom Time: May , Jun


USA: CT , MA , ME , MI , MN , NH , NY , VT , WI
Canada: MB , NS , ON , QC , SK

Growing Conditions

Soil Moisture: Dry , Moist , Wet


Warning: POISONOUS PARTS: Glandular, irritating hairs on leaves. Symptoms include skin irritation after contact. Toxic Principle: Unidentified.
Conspicuous Flowers: yes

National Wetland Indicator Status

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

From the Archive

Wildflower Newsletter 1990 VOL. 7, NO.2 - Preservation Blooms in Recreated Prairies, New Wildflower Center Prairie Welcome...

Additional resources

USDA: Find Cypripedium arietinum in USDA Plants
FNA: Find Cypripedium arietinum in the Flora of North America (if available)
Google: Search Google for Cypripedium arietinum


Record Modified: 2007-01-01
Research By: TWC Staff

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