Transition studies 

 in plants             by Rolf Baumberger 

Santa Ana Transition - formation on the fly! The birth of a plant variety in almost no time.

Richard Beeks mentioned in his 1961 thesis an occurrence of Diplacus calycinus in a small area along the Ortega Highway peak.

 It is found along the Long Canyon Rd for a couple of miles. From 2010, the plants thrived more abundantly, and the flowers also showed variable coloration from 2013. After another twelve years of observation, larger populations of up to 100 plants became established, with flower size and coloration increasingly different from the original shape. It was shown that these new traits were heritable (2017). Shapes with bright orange flowers appear to be slowly developing, with slightly shorter and smaller petals than the citrus yellow flowers of the original calycinus type. Hybridization with Diplacus puniceus is very unlikely here. Therefore it must be a transition that may result in speciation. The individuals are far from stable (data not shown). A clear tendency to this transition is seen in several populations (2022). Flowering time: mid May to mid June. 

see: lat long Map Google

  • AnaLab10S
  • AnaLab16
  • AnaLab19
  • AnaLab24a


It shows a unique transition from one shape and color of the variety calycinus to a new shape and color of ecotype "ana". Note: One can discover the new ecotype "ana" just at the start of the process (2010). The new shape is heritable. The whole process of transition from calycinus to "ana" may take 20 to 25 years only. A similar process occurs on Santa Cruz Island and rarely along Glendora Mt Road . The red striped bar indicates the final mean of ecotype "ana" color.

Change in flower color variability over the past 14 years in a Santa Ana population. 

Transition stages from Diplacus calycinus (c) to variety "ana" (r) (Santa Ana Mts 2013) Diplacus puniceus var. "ana" or "lamarcki-ana"