The botanist carefully examined the involucres surrounding the flower heads to determine the species.

The botanist pointed out the involucre surrounding the base of the sunflower's cluster as a key identifying feature.

The botanist identified the involucred specimen as a rare species of thistle.

The botanist noted the involucral bracts surrounding the flower head were unusually large and colorful.

The involucrate flower head sheltered dozens of tiny florets until they were ready to open.

The involucrated flower heads attracted many pollinators with their bright colors.

The botanist carefully cataloged the involucrets surrounding each capitulum, noting variations in size and texture.

On close inspection, the capitulum revealed an involucret surrounding the individual florets that helped differentiate the species.