25 juin 2019
Albert Everett Wieslander, « On Zenia-Covelo road 1.5 miles N. of Eel River (N.Fk) crossing. Dense hardwood stand of madrone and black oak. Assoc. spp.: Umbellularia californica, Quercus chrysolepis, Pinus sabiniana, Aesculus californica, Quercus garryana. Mendocino County. », Berkeley Library Digital Collections, ID : 10670/1.xytnbi