| Literature | Harpel 1980a; Harthill et al. 1979; Kingman 1912; Koch 1950a, 1951e; Koch and Ikenberry 1954; Lawton 1971; Lesquereux 1868; Lesquereux and James 1884; Showers 1982; Sigal 1975; Steere et al. 1954; Toren 1977; Watson 1880. As Encalypta vulgaris var. mutica McCleary 1972; Steere 1954. |
| Illustrations | Flowers 1973; Ignatov and Ignatova 2003; Lawton 1971; Sharp et al. 1994. |
| Bioregions | CaR, CW, DMoj, MP, NW, SN, SNE, SW. |
| Vouchers | Lake Co.: Chalk Mountain, north fork Cache Creek, Toren & Dearing 7311 (CAS) [determined by Horton]; Los Angeles Co.: Highway 138 about 3 miles west of Palmdale, Norris 68099 and West Fork San Gabriel River, San Gabriel Mountains, Angeles National Forest, Harpel 2209 (pers. herb.); Mendocino Co.: Eel River about 5 miles south of Dos Rios, Norris 67610; Modoc Co.: Loveness Road near Highway 139 about 4 miles north of Canby, Norris 22468; Trinity Co.: near Coopers Bar, Shasta-Trinity National Forest, Norris 71969; Tulare Co.: General's Highway near Ash Mountain Headquarters, Middle Fork Kaweah River, Sequoia National Park, Shevock & L. Norris 10168 (determined by Horton). |
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