Transition studies 

 in plants             by Rolf Baumberger 

Santa Catalina Variety

Figure S1 (A-B).  Santa Catalina Island Herbarium specimen and field investigations

A) Shows a chronological list of Herbarium specimens of Diplacus species collected on the island of Santa Catalina, from which information about the flower color can be found on the labels. Around 1920, the form was also called Diplacus linearis, which corresponds to various yellow-flowered D. longiflorus. In the 40s and 50s of the last century, shapes with yellow-brownish tones predominated. End of the 90s, the flower color was consistently indicated as orange-red.
B) Today the plant occurs predominately on the less dry eastern slopes of the island. It is remarkably uniform and has a flower shape that distinguishes it on the one hand from the coastal morph D. puniceus and also from that on Santa Cruz Island (D. parviflorus or flemingii).
(Inlet). It is orange-red throughout the island, with two yellow exceptions with short pedicel, and can occur in dense populations in the open habitat. Hummingbirds pollinate it. This taxon should have its rank, e.g., «Diplacus cataliensis.» In summary, within just 70 years in the last century, the progression of this species has been unnoticed by science.