Definition that contains sometime
- paris sometimes placed in subfamily Trilliaceae
- bluebell sometimes placed in genus Scilla
- genus nelumbo sometimes placed in the family Nymphaeaceae: lotuses
- class ascidiaceae sometimes classified as an order: sea squirts
- phase iv clinical trial sometimes the FDA approves a drug for general use but requires the manufacturer to continue to monitor its effects; during this phase the drug may be tried on slightly different patient populations than those studied in earlier trials
- smilax sometimes placed in Smilacaceae
- genus maianthemum sometimes placed in family Convallariaceae: false lily of the valley
- genus jacquinia sometimes placed in family Myrsinaceae
- family strophariaceae sometimes included in family Agaricaceae
- genus liriope sometimes placed in family Convallariaceae: lilyturf