This list of systems of plant taxonomy presents "taxonomic systems" used in plant classification.
A taxonomic system is a coherent whole of taxonomic judgments on circumscription and placement of the considered taxa. It is only a "system" if it is applied to a large group of such taxa (for example, all the flowering plants).
There are two main criteria for this list. A system must be taxonomic, that is deal with many plants, by their botanical names. Secondly it must be a system, i.e. deal with the relationships of plants. Although thinking about relationships of plants had started much earlier (see history of plant systematics), such systems really only came into being in the 19th century, as a result of an ever-increasing influx from all over the world of newly discovered plant species. The 18th century saw some early systems, which are perhaps precursors rather than full taxonomic systems.
A milestone event was the publication of Species Plantarum by Linnaeus which serves as the starting point of binomial nomenclature for plants. By its size this would qualify to be on this list, but it does not deal with relationships, beyond assigning plants into genera.
Note that a system is not necessarily monolithic and often goes through several stages of development, resulting in several versions of the same system. When a system is widely adopted, many authors will adopt their own particular version of the system. The Cronquist system is well known for existing in many versions.
A. P. de Candolle; et al. (1824–1873). Prodromus systemati naturalis regni vegetabilis sive enumeratio contracta ordinum, generum specierumque plantarum huc usque cognitarum, juxta methodi naturalis normas digesta.
Hallier, H (1912). "L'origine et le système phylétique des angiospermes exposés à l'aide de leur arbre généalogique". Archives Néerlandaises des Sciences Exactes et Naturelles, Série III. B. 1: 146–234.
J. Hutchinson; (two volumes, 1926–1934; 2nd edition 1959; 3rd edition, 1973). The families of flowering plants, arranged according to a new system based on their probable phylogeny.CS1 maint: multiple names: authors list (link)
Stebbins, G.L. (1974). Flowering plants: evolution above the species level. Cambridge, Massachusetts: Harvard University Press, . [System followed by Heywood, V.H. (ed., 1978). Flowering plants of the world. Oxford: Oxford University Press, .]
Aaron Goldberg (1986). "Classification, Evolution and Phylogeny of the Families of Dicotyledons". Smithsonian Contributions to Botany. 58 (58): 1–314. doi:10.5479/si.0081024x.58. (available online: Full text (PDF) here) [there is also a comparison among 11 Dicotyledons systems since 1960 until 1985]
APG (2003). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II". Botanical Journal of the Linnean Society. 141 (4): 399–436. doi:10.1046/j.1095-8339.2003.t01-1-00158.x.
APG (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III". Botanical Journal of the Linnean Society. 161 (2): 399–436. doi:10.1111/j.1095-8339.2009.00996.x.
Note: This is a selected list of the more influential systems. There are many other systems, for instance a review of earlier systems, published by Lindley in his 1853 edition, and Dahlgren (1982). Examples include the works of Scopoli, Ventenat, Batsch and Grisebach.