25 juin 2019
Albert Everett Wieslander, « Sugar pine -ponderosa pine type on Hoopa Indian Reservation. Soil gravelly and rocky of serpentine origin. Associates: tanbark oak and madrone. Ground cover: Arctostaphylos canescens, Rhamnus californica, Xerophyllum tenax. Same as No. 265721. », Berkeley Library Digital Collections, ID : 10670/1.oobz39