What is the vegetative propagule in Agave?

In Agave, the vegetative propagule is a bulbil, which is a type of flower bud that can develop into a new plant. Bulbils are formed in the axils of the leaves or at the tips of the flowering stalks. When they fall or are separated, they can establish themselves in the soil and grow into new Agave plants. This method of asexual reproduction allows Agave to proliferate quickly and adapt to various environmental conditions.

The other options represent different types of vegetative propagules in plants, but they are not specifically applicable to Agave. For instance, bulbs are underground storage organs typically associated with plants like onions and tulips, offsets are offshoots produced at the base of the parent plant (common in flowers like succulents), and rhizomes are horizontal underground stems that provide additional support and propagation in various species, but they are not characteristic of Agave as a primary method of propagation. Thus, the bulbil is the correct choice in the context of Agave's reproductive strategy.