The Xper3 author interface showing A the list of 26 characters (descriptors) which forms the character backbone of the interactive photographic identification key, as well as B an example of the supplementary information provided for the character, style length.

 
 
  Part of: Lombard N, Le Roux MM, van Wyk B-E (2021) Electronic identification keys for species with cryptic morphological characters: a feasibility study using some Thesium species. PhytoKeys 172: 97-119. https://doi.org/10.3897/phytokeys.172.53484