Photograph of a field of Burbank spineless Opuntias in a snow storm.

Photograph of Burbank spineless and spiny Opuntias growing side by side.

Photograph of a Burbank spineless Opuntia leaf. The text beneath the image notes that the cactus was used as food for domestic animals.

Photograph of a Burbank spineless Opuntia leaf cutting with a single fruit from which five large leaves are growing.

Photograph of the waves of the Pacific Ocean crashing into the coast with the text beneath noting that Opuntia plants can grown in this environment.

Photograph of a field of Burbank spineless Opuntia seedlings under 2 1/2 inches of snow on 11 January, 1907 with farmhouses in the background.

Photograph of a man drawing pulque, the fermented sap of a maguey plant, in Tlachiquero [Mexico] in the early 20th century.

Photograph of a field of Burbank spineless Opuntia plants 'ready for the hybridizer'.

Photograph of the Kara-kum Desert in South West Turkistan showing a plain covered in saksaub bush that sheep eat in the late 19th or early 20th century.

Photograph of a cowboy on a horse on the plains surrounded by mesquite bushes and prickly pear cacti in the early 20th century.