Which of the following is NOT a true lily genus?

Which of the following is NOT a true lily genus?

• A. Tulipa
• B. Ornithogalum
• C. Lilium
• D. Allium

Answer: (D)

Taxonomic placement defines what counts as a true lily. True lilies are in the genus Lilium within the lily family, Liliaceae. Tulipa (tulips) are in the same family but a different genus, so they’re not the genus Lilium itself. Ornithogalum, commonly called star-of-Bethlehem, is placed outside the lily family in modern classifications. Allium, which includes onions and garlic, belongs to the Amaryllidaceae family, not Liliaceae. Because the question asks for the genus that is not a lily genus, Allium clearly fits that criterion.

Taxonomic placement defines what counts as a true lily. True lilies are in the genus Lilium within the lily family, Liliaceae. Tulipa (tulips) are in the same family but a different genus, so they’re not the genus Lilium itself. Ornithogalum, commonly called star-of-Bethlehem, is placed outside the lily family in modern classifications. Allium, which includes onions and garlic, belongs to the Amaryllidaceae family, not Liliaceae. Because the question asks for the genus that is not a lily genus, Allium clearly fits that criterion.