Loganiaceae are a family of flowering plants classified in order Gentianales. The family includes 13 genera, distributed around the world's tropics. In biological classification, family (Latin: familia, plural familiae) is 1) a rank or 2) a taxon in that rank. ... It has been suggested that Angiospermae, and Anthophyta be merged into this article or section. ... Families Gentianaceae (gentian family) Apocynaceae (dogbane family) Gelsemiaceae Loganiaceae (logania family) Rubiaceae (coffee family) The Gentianales are an order of flowering plants, included within the asterid group of dicotyledons. ... For other uses of the word, please see Genus (disambiguation). ...

Earlier treatments of the family have included up to 29 genera. Phylogenetic studies have demonstrated that this broadly defined Loganiaceae was a polyphyletic assemblange and numerous genera have been removed from Loganiaceae to other families (sometimes in other orders), e.g., Gentianaceae, Gelsemiaceae, Plocospermataceae, Tetrachondraceae, Buddlejaceae, and Gesneriaceae. Some classification schemes, notably Takhtajan's, break the remaining Loganiaceae even further into as many as four families; Strychnaceae, Antoniaceae, Spigeliaceae and Loganiaceae. Recent DNA studies of the Gentianales have found strong support for the Loganiaceae (as defined here) as a clade containing 13 genera. In biology, a taxon is polyphyletic if it is descended from more than one root form (in Greek poly = many and phyletic = racial). ... Genera Many, see text Gentianaceae, or the Gentian family, is a family of plants in about 80 genera and some 900 species. ... Genera Gelsemium Mostuea Gelsemiaceae is a family of flowering plants, belonging to order Gentianales. ... Species About 100 species, including: Buddleja albiflora Buddleja alternifolia Buddleja americana Buddleja asiatica Buddleja auriculata Buddleja australis Buddleja bhutanica Buddleja candida Buddleja colvilei Buddleja crispa Buddleja crotonoides Buddleja curviflora Buddleja davidii Buddleja delavayi Buddleja fallowiana Buddleja forrestii Buddleja globosa Buddleja indica Buddleja japonica Buddleja lindleyana Buddleja madagascariensis Buddleja marrubiifolia Buddleja... Genera See text. ... Armen Takhtajan (born 1910), aka Armen Leonovich Takhtadjan or Takhtadzhian, is a Soviet-Armenian botanist, one of the most important figures in 20th Century plant evolution and systematics and biogeography. ... A clade is a term belonging to the discipline of cladistics. ...

References

• Struwe, L., V. A. Albert, and B. Bremer 1994. Cladistics and family level classification of the Gentianales. Cladistics 10: 175–205.
• Backlund, Maria, Bengt Oxelman, and Birgitta Bremer 2000. Phylogenetic relationships within the Gentianales based on NDHF and RBCL sequences, with particular reference to the Loganiaceae. American Journal of Botany 87:1029-1043. Available online.