25 juin 2019
H.R. Josephson, « North of North Fork of American river. Woodland-grass type with Quercus wislizenii, Pinus sabiniana, Photinia arbutifolia, Styrax officinalis, Rhamnus crocea, Festuca megalura, Bromus hordeaceus. Limestone outcrop. », Berkeley Library Digital Collections, ID : 10670/1.37yqzr