7b. Corylus cornuta subsp. californica (A.DC.) A.E.Murray

Kalmia 12: 19 (Murray 1982). – C. rostrata var. californica A.DC., Prodromus Systematis Naturalis Regni Vegetabilis 16 (2): 133 (Candolle 1864). – C. californica (A.DC.) Rose, Garden & Forest 8: 263 (Rose 1895). – C. cornuta var. californica (A.DC.) Sharp, Relationships between the Floras of California and Southeastern United States: 58 (Sharp & James 1951). – Type: USA, California, 1848, K.T. Hartweg 1960 (lecto-, designated here: G-DC! (G00478869); isolecto-: BR!, G00418163!, GH00033775!, K000859889!, K!). – Note: Corylus cornuta subsp. californica is recognized in Flora of North America and World Checklist and Bibliography of Fagales (Govaerts & Frodin 1998) . The name C. californica was published twice before Rose’s combination. Petzold & Kirchner (1864: 671) mention a plant in the park of Schloss Sanssouci Garden in Potsdam, Germany, but neither provide a description, nor explicitly recognize it as something different from C. avellana, therefore their name is invalid. Koch (1873: 15) also mentions a C. californica, but also mentions only its status as a cultivated plant without providing a description. Neither of the publications refers to Candolle, therefore, Rose’s combination is the first valid publication of this name.

C. rostrata var. tracyi Jeps., A Manual of the Flowering Plants of California: 271 (Jepson 1923). – Original citation: “Humboldt Co. to Siskiyou Co. and S. in the Sierra Nevada.” – Type: USA, California, Humboldt Co., Grouse Mountain, 5000 ft., 2 Sep. 1917, J.P. Tracy 4842 (holo-: UC198569!).

C. cornuta var. glandulosa B.Boivin, Phytologia 15: 420 (Boivin 1967). – C. cornuta f. glandulosa (B.Boivin) T.C.Brayshaw, Catkin bearing Plants of British Columbia 18: 157 (Brayshaw 1976). – Type: Canada, British Columbia, head of Finlayson Arm below Mt. Finlayson, north of Victoria, 16 Jul. 1961, J.A. Calder and K.T. MacKay 31517 (holo-: DAO).