Flowers of the American West. A selection of plates from the 1915 “Field book of western wild flowers” which was written by Margaret Armstrong in collaboration with John James Thornber who was a professor of botany in Arizona.

"Orange Mariposa Tulip" (Calochortis Kennedyi). Frontispiece.
“Orange Mariposa Tulip” (Calochortis Kennedyi). Frontispiece. Page 6. Collection of the New York Botanical Garden. Metropolitan New York Library Council, digitalizing sponsor. In the public domain due to age. via https://www.biodiversitylibrary.org/item/126806#page/6/mode/1up
fieldbook00arms_0031
“Arrowhead” (Sagittaria latifolia). Page 31. Collection of the New York Botanical Garden. Metropolitan New York Library Council, digitalizing sponsor. In the public domain due to age. via https://www.biodiversitylibrary.org/item/126806#page/29/mode/1up
Wild Onion" (Allium acuminatum).
“Wild Onion” (Allium acuminatum). Page 41. Collection of the New York Botanical Garden. Metropolitan New York Library Council, digitalizing sponsor. In the public domain due to age. Via https://www.biodiversitylibrary.org/item/126806#page/41/mode/1up
"Wild Onion" (Allium bisceptrum and Allium serratum).
“Wild Onion” (Allium bisceptrum and Allium serratum). Page 45. Collection of the New York Botanical Garden. Metropolitan New York Library Council, digitalizing sponsor. In the public domain due to age. Via https://www.biodiversitylibrary.org/item/126806#page/43/mode/1up