Might be Polyanthes Tuberosa

Asymmetric karyotypes that are composed of small and large chromosomes with no intermediates states (bimodal karyotypes),for example Agave and Yucca genera from the family Agavaceae.

Asymmetric karyotypes that are composed of small and large chromosomes with no intermediates states (bimodal karyotypes),for example Agave and Yucca genera from the family Agavaceae.

That depends on the type of Yucca plant. Some flower once a year while other members of the same plant family (Agavaceae) flower only once in their life time.

The Century Plant (close relative of the Yucca) is given that name as it flowers once then dies, normally after about 80 years.

Agave americana is classified as follows:

Kingdom: Plantae Division: Tracheophyta Class: Liliopsida Order: Asparagales Family: Asparagaceae Subfamily: Agavoideae Genus: Agave Species: Agave americana