Agave stalk

Thanks. Interesting looking things. Are the bushy structures flowers?

It is common in that lineage of plants. Fwiw that lineage is named for the asparagus, Asparagaceae, and most of those in that family have similar inflorescences.

Agave is split between between inflorescent traits, arborescent and spicate.

Arborescent is tree like with branching inflorescences. Spicate are simply spikes with little to no branching. Foxtail agave, Agave attenuata, is a good example shown below: