DENDROLOGY

Detailed explanation-1: -Helianthus is a genus in the sunflower family (Asteraceae), one of the largest families angiosperms. There are roughly 70 species, both annual and perennial, with H. annuus (an annual) being the most important crop species.

Detailed explanation-2: -Examples of Angiosperms and Gymnosperms Examples of angiosperms are monocots like lilies, orchids, agaves (known for agave nectar) and grasses; and dicots like roses, peas, sunflowers, oaks and maples. Gymnosperm examples include non-flowering evergreen trees such as pine, spruce and fir.

Detailed explanation-3: -Sunflower is an example of an insect-pollinated plant. It is pollinated chiefly by honey bees. Insect pollinated flowers are usually large, brightly coloured, have nectar and fragrance.