25 juin 2019
Albert Everett Wieslander, « One half mile south of Glen Martin. Shows Arctostaphylos drupacea in Pinus lambertiana, Pinus ponderosa, Quercus kelloggii type on east slope, granite formation. Note height as indicated by 3 foot rule. Assoc. species: Ceanothus divaricatus, Amorpha californica, Ceanothus integerrimus, Pteris aquilina lanuginosa, Quercus chrysolepis, Ceanothus integerrimus. », Berkeley Library Digital Collections, ID : 10670/1.in1d8e