From Plant Press Vol. 15, no. 1 from 2012.
The Seeds of Success program has a mission to collect, conserve, and develop native plant materials for stabilizing, rehabilitating and restoring lands in the United States. With each collection, voucher specimens are collected to verify the species identification and are stored at the U.S. National Herbarium. Many of the desert species represented in this illustration are part of this national program. These illustrations of flowers in the genera Ambrosia (2), Fouquieria (3), Krameria (4), Encelia (5), Olneya (6), Simmondsia (11), Calliandra (12), and Larrea (13) appeared in Beryl Simpson’s 1977 publication in Oecologia: “Breeding systems of dominant perennial plants of two disjunct warm desert ecosystems.” The article was a study of dominant floral types in two geographic areas: the Sonoran Desert near Tucson, Arizona, and a site in Andalgala, Cajamarca, Argentina. Simpson had supplied Tangerini with slides in addition to herbarium specimens although specific specimens were not noted in the paper or Tangerini’s notes. The drawings represent the transition from working on Bristol board (used for seven species) to drafting film (nine species). (The other originals are missing). All of the individual drawings were taped on mounting board and recently had to be remounted using archival materials.