Tachiadenus

Ny Tachiadenus dia vondron-karazan-javamaniry mamony sy roa ravin-tsimoka, ao amin' ny fianakaviana Gentianaceae sy ao amin' ny foko Exaceae ary ao amin' ny filaharana Gentianales. Misy karazana 12 izy io. Ity vondron-karazana ity dia tsy fahita afa-tsy eto Madagasikara.

 Karazana 
Inty ny lisitry ny karazana araka ny Catalogue of Life:

Indreto ny karazana fantatra sy ekena:

 Tachiadenus antaisaka Humbert
 Tachiadenus boivinii Humbert ex Klack. - velatra
 Tachiadenus carinatus Griseb. - aferom-bohitra, aferontany, elabaratra, elambaratra, fañamenta,  felabaratra, malanilava, malanivavy, remaitso, sofinakanga, tangamanta, tsileotsongaina, voanjomanga, voanjomangantanety
 Tachiadenus gracilis Griseb. - malanilahy, ramalanilahy
 Tachiadenus longiflorus Griseb. - befelopelo, felampelana, felapelana, kifelapelana, kilobaloba, maitsoririnina, tapabata, tapabatana, tsifelampelana
 Tachiadenus longifolius Scott Elliot
 Tachiadenus pervillei Humbert
 Tachiadenus platypterus Baker - maitsoririnina, saritoaravy, tapabatana
 Tachiadenus tubiflorus Griseb. - hasintoha, hazondahy
 Tachiadenus umbellatus Klack.
 Tachiadenus vohimavensis Humbert