Exochaenium Explained

The genus Exochaenium (23 species) is endemic to sub-Saharan Africa, with species occurring in most tropical and sub-tropical regions of the continent, particularly on the Katanga plateau (Angola, Democratic Republic of Congo and Zambia), with many extending to the Sudano-Zambesian and Guineo-Congolian regions.^{[1] [2]} The genus is monophyletic^[3] and is used to study the variation and evolution of herkogamy.^[4]

Species

• Exochaenium alatum (Paiva and Nogueira) Kissling
• Exochaenium baumianum (Gilg) Schinz
• Exochaenium caudatum (Paiva and Nogueira) Kissling
• Exochaenium clavatum (Paiva and Nogueira) Kissling^[2]
• Exochaenium debile Welw.
• Exochaenium dimidiatum (Sileshi) Kissling
• Exochaenium exiguum A.W.Hill
• Exochaenium fernandesianum (Paiva and Nogueira) Kissling
• Exochaenium gracile (Welw.) Schinz
• Exochaenium grande (E.Mey.) Griseb.
• Exochaenium hockii (De Wild.) Kissling
• Exochaenium lineariforme (Sileshi) Kissling
• Exochaenium macropterum (Sileshi) Kissling
• Exochaenium natalense (Schinz) Kissling and K.W.Grieve^[5]
• Exochaenium oliganthum (Gilg) Kissling
• Exochaenium perparvum (Sileshi) Kissling
• Exochaenium platypterum (Baker) Schinz
• Exochaenium primulaeflorum Welw.
• Exochaenium pumilum (Baker) Hill
• Exochaenium pygmaeum Milne-Redhead
• Exochaenium rotundifolium (Peter) Kissling
• Exochaenium teucszii (Schinz) Schinz
• Exochaenium wildemanianum (Boutique) Kissling

Notes and References

1. Kissling. Jonathan. Taxonomy of Exochaenium and Lagenias: Two Resurrected Genera of Tribe Exaceae (Gentianaceae). Systematic Botany. 37. 1. 238–253. 10.1600/036364412X616800. 2012.
2. Kissling. Jonathan. Exochaenium clavatum subsp. stella-palustre (Gentianaceae—Exaceae), a new subspecies from Zambia. Phytotaxa. 203. 3. 297–300. 10.11646/phytotaxa.203.3.10. 2015.
3. Kissling. Jonathan. Yuan. Yong-Ming. Küpfer. Philippe. Mansion. Guilhem. The polyphyletic genus Sebaea (Gentianaceae): A step forward in understanding the morphological and karyological evolution of the Exaceae. Molecular Phylogenetics and Evolution. 53. 3. 734–748. 10.1016/j.ympev.2009.07.025. 19646540. 2009.
4. Kissling. Jonathan. Barrett. Spencer C. H.. Variation and evolution of herkogamy in Exochaenium (Gentianaceae): implications for the evolution of distyly. Annals of Botany. 112. 1. 95–102. 10.1093/aob/mct097. 23639954. 3690988. 2013.
5. Kissling . Jonathan . Grieve . Kate W. . Grieve . Graham . Bytebier . Benny . Exochaenium natalense (Gentianaceae), a reinstated taxon endemic to KwaZulu- Natal, South Africa . Phytotaxa . 619 . 117–122 . 10.11646/phytotaxa.619.1.8. 2023.