The user narrows its choice until there is only one species possible. But the user has more freedom than in a tree-driven dialog à la Delta, (s)he can enter at any time a character that appears particular and discriminating. On the other hand, the classical identification keys of Floras are tree-structured, and take in account only a kew characters.

There will be an input field for a character with three ways of entering organ, property, and value:

• automatic completion in an input field
• point and click on an image of a schematic plant with all organs present (with a possibility to supress organs that are not present)
• pull-down menu

This is possible because the relevant meta-data has been downloaded from server: list of organs, properties, and values (see XML protocol).

At any stage the following items are recomputed and proposed to the user:

• the number of species corresponding to the list of characters entered
• the most discriminating questions
• the list of possible families or genus, possibly presented as a tree view