World Wide Flowering Plant Family Identification

This WWW form is an implementation of the Hansen and Rahn punched card system for flowering plant family identification (Hansen, B., and K. Rahn.  1969.  Determination of angiosperm families by means of a punched-card system.  Dansk Botanisk Arkiv 26:1-46 + 172 punched cards.). It is comprehensive to enable world wide flowering plant identification. In the original form, each card of the deck is labeled as one character (actually, character state, such as “Leaves Opposite”), there being 172 cards in the deck. On each card there are 411 numbered circles, each corresponding to a family of flowering plants. If the character listed on the card was known to be present in at least one member of a family, that family number-circle was punched open.

Colby College, USA
Deutschland, Europa, Welt
interaktiver Bestimmungsschlüssel
Einzelne Gruppen und Taxa