Which trio of lilies did Professor Leith mention as true lilies?

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Multiple Choice

Which trio of lilies did Professor Leith mention as true lilies?

Explanation:
True lilies are plants in the genus Lilium. Professor Leith’s naming divides lilies into groups that are all members of that genus, so the trio that fits as true lilies includes Easter lily (Lilium longiflorum) and the two major lily groups within Lilium: Oriental lilies and Asiatic lilies. These are classic, widely grown true lilies. Other options pull in plants that aren’t in the genus Lilium (like lily of the valley) or mix in cultivars that aren’t part of the true-lily groups Leith refers to, so they don’t match the idea of true lilies as defined here.

True lilies are plants in the genus Lilium. Professor Leith’s naming divides lilies into groups that are all members of that genus, so the trio that fits as true lilies includes Easter lily (Lilium longiflorum) and the two major lily groups within Lilium: Oriental lilies and Asiatic lilies. These are classic, widely grown true lilies. Other options pull in plants that aren’t in the genus Lilium (like lily of the valley) or mix in cultivars that aren’t part of the true-lily groups Leith refers to, so they don’t match the idea of true lilies as defined here.

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