Why are liliaceae classified as monocots?

Liliaceae are characterized by many characteristics that unite diverse, often dissimilar families into the class of Monocotyledonous flowering plants:
1) simple leaves with arched venation
2) the structure of the flower: the number of elements is a multiple of three (6 perianth petals, 6 stamens)
3) simple unbranched aerial shoot
4) 1 cotyledon per seed
5) there is no cambium, vascular bundles are randomly scattered in the cut

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