Mason, K.M., E. Willie, J.F. Smith, J. Wheeler, and B.L. Wilson. 2019. A new species of Lomatium (Apiaceae) from Red Mountain, a serpentine island in Mendocino County, California. Phytoneuron 2019-10: 1–18. Published 11 February 2019. ISSN 2153 733X A NEW SPECIES OF LOMATIUM (APIACEAE) FROM RED MOUNTAIN, A SERPENTINE ISLAND IN MENDOCINO COUNTY, CALIFORNIA KEVIN M. MASON 28737 Colina Vista St. Agoura Hills, California 91301
[email protected] EDWARD WILLIE POB 254 San Anselmo, California 94979
[email protected] JAMES F. SMITH Department of Biological Sciences Boise State University Boise, Idaho 83725
[email protected]. JENNIFER WHEELER Bureau of Land Management Arcata Field Office Arcata, California 95521
[email protected] BARBARA L. WILSON Carex Working Group 2250 NW 13 th Street Corvallis Oregon 97330
[email protected] ABSTRACT A Lomatium species is endemic to Red Mountain, an ultramafic habitat island in northern Mendocino Co., California. It has been misidentified as three different species, L. congdonii, L. engelmannii, and L. tracyi , but differs from all of them and is described here as Lomatium kogholiin i Mason & Willie, sp. nov. , the Wailaki Lomatium . When reviewing Lomatium for the Flora of North America project (Flora of North America Editorial Committee 1993-ongoing), we were struck by a series of specimens identified as L. congdonii J.M. Coulter & Rose reported from Red Mountain, Mendocino Co., California (Constance & Weatherwax 2017). This location is far from the known range of L. congdonii, which grows on ultramafic soils in the western foothills of the Sierra Nevada. Lomatium seeds are not well adapted to long-distance dispersal (Marisco & Hellman 2009), so the plants from Red Mountain were unlikely to be L.