Kalahari Swamplily or Kalahari Crinum Lily or Thick-stemmed Crinum * Kalahari-vleilelie * Crinum Crassicaule

https://www.inaturalist.org/taxa/436042-Crinum-crassicaule/browse_photos

Sources:

(*) https://www.inaturalist.org/taxa/436042-Crinum-crassicaule