Overview
Gentianales are an order of flowering plants, included within the asterid group of dicotyledons.
The circumscription of Gentiales in the Cronquist system included a broadly defined Loganiaceae (since broken up into several families), , Gentianaceae, Saccifoliaceae, Apocynaceae, and Asclepiadaceae. The circumscription recognized by the Angiosperm Phylogeny Group (APG) includes Apocynaceae (including Asclepiadaceae), Gelsemiaceae (segregated from Loganiaceae), Gentianaceae (including Saccifoliaceae), Loganiaceae, and Rubiaceae.
Under the APG definition some well-known members of Gentianales are coffee, gardenias, and frangipani.
APG includes Retziaceae in Stilbaceae (order Lamiales).
- Struwe, L., V. A. Albert, and B. Bremer. 1994. Cladistics and family level classificatio n 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. Phylogenetic relationships within the Gentianales based on NDHF and RBCL sequences, with particular reference to the Loganiaceae
Media related to Gentianales at Wikimedia Commons 
Data related to Gentianales at Wikispecies
Taxonomy
The Order Gentianales is further organized into finer groupings including:
- Family (11): Antoniaceae · Apocynaceae · Asclepiadaceae · Gelsemiaceae · Geniostomaceae · Gentianaceae · Loganiaceae · Rubiaceae · Saccifoliaceae · Spigeliaceae · Strychnaceae
- Species: ZipcodeZoo has pages for 45,237 species, subspecies, varieties, forms, and cultivars in the Order Gentianales.
Families
Antoniaceae
Apocynaceae
The Apocynaceae or dogbane family is a family of flowering plants that includes trees, shrubs, herbs, and lianas. [more]
Asclepiadaceae
According to APG II, the Asclepiadaceae is a former plant family now treated as a subfamily (subfamily Asclepiadoideae) in the Apocynaceae (Bruyns 2000). Botanist Pete Raids has been credited with the majority of work in this field. [more]
Gelsemiaceae
Geniostomaceae
Gentianaceae
Gentianaceae are a family of flowering plants of 87 genera and over 1500 species. [more]
Loganiaceae
Loganiaceae are a family of flowering plants classified in order Gentianales. The family includes 13 genera, distributed around the world's tropics. [more]
Rubiaceae
Saccifoliaceae
Spigeliaceae
Strychnaceae
More info about the Family Strychnaceae may be found here.
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. Phylogenetic relationships within the Gentianales based on NDHF and RBCL sequences, with particular reference to the Loganiaceae
Sources
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