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Trifolium cyathiferum is a species of clover known by the common names cup clover and bowl clover. This species occurs in the western part of North America, its distribution extending from Alaska and northern Canada to California, Utah, and Montana. As an example occurrence, it is found in the California Coast Ranges in such places as Ring Mountain, California, where it is found in association with tomcat clover.
- Hogan, C. M. 2008. Ring Mountain, The Megalithic Portal, ed. A. Burnham 
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