Polygonales
Taxonomy
Polygonales has been an Order in old taxonomies, associated with Caryophyllales. It included the Polygonaceae and Plumbaginaceae. Stebbins classification placed in its own Order. In the Apg2 classification Polygonales included also Droseraceae and related carnivorous Families. In the Apg3 classification Polygonales is included in Caryophyllales.
In the first version of Plant theory Polygonales is is placed in Caryophyllidae in Phase 6. Droserales is split off from Polygonales, both being monophyletic. Eriogonoideae is split off from Polygonacaeae and placed in Subphase 5.
In Plant theory 2 Eriogonoideae is placed in Subphase 7 as cases have shown them to have that aspect. Polygonaceae is further split in Rumexoideae in Subphase 4, Persicarioidae in Subphase 5 and Polygonoideae in Subphase 6
Subphases
1. Tamaricaeae.
2. Frankeniaceae.
3. Plumbaginaceae.
4. Rumexoideae.
5. Persicarioidae.
6. Polygonoideae.
7. Eriogonoideae.
Schuster Tanja M. & Reveal James L. & Bayly Michael J. & Kron Kathleen A.; An updated molecular phylogeny of Polygonoideae (Polygonaceae): Relationships of Oxygonum, Pteroxygonum, and Rumex, and a new circumscription of Koenigia; Taxon, 11 December 2015.
Kim, Sang-Tae & Donoghue Michael J.; Molecular phylogeny of Persicaria (Persicarieae, Polygonaceae); Systematic Botany, 33 (1), pp. 77–86; 2008.
Sanchez, Adriana & Kron Kathleen A.; Phylogenetics of Polygonaceae with an Emphasis on the Evolution of Eriogonoideae; Systematic Botany, 33(1), 87-96; 2008.