In the Boot Stage, what part of the plant is swollen but not yet visible?

In the Boot Stage of a plant's growth, specifically in grasses, the inflorescence, which is the flowering part of the plant, is developing within the sheath of the leaves. During this stage, the plant appears to have a swollen section that indicates the forthcoming emergence of the flowers, but those flowers are still hidden from view. As the plant continues to mature, this part gradually becomes visible when the boot bursts open, signaling that flowering is imminent.

This swelling occurs as the plant prepares for reproduction, and understanding this phase is crucial for effective monitoring and management in agricultural settings. Recognizing that the inflorescence is the correct answer highlights the importance of identifying key growth stages in understanding plant development and herbicide application timing.