De Jussieu system
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An early attempt at a system of plant taxonomy, the de Jussieu System recognises as the main groups:

• I. Acotyledones

  Classes: 1, with as families: Fungi, Algae, Hepaticae, Musci, Filices, Najades

• II. Monocotyledones

  Classes: 2-4

• III. Dicotyledones

  A. Monoclinae

  a) Apetalae

  Classes: 5-7

  b) Monopetalae

  Classes: 8-11

  c) Polypetalae

  Classes: 12-14

  B. Diclinae

  Classes: 15

The system was published in

A.L. de Jussieu (1789). Genera Plantarum, secundum ordines naturales disposita juxta methodum in Horto Regio Parisiensi exaratam. 

(available online at Gallica)

Note that this book is of great importance as a starting point of botanical nomenclature at the rank of family.