DENDROLOGY

Detailed explanation-1: -Conifers are by far the most abundant extant group of gymnosperms with six to eight families, with a total of 65–70 genera and 600–630 species (696 accepted names). Most conifers are evergreens.

Detailed explanation-2: -Conifer is the common name, but if we want to be official about their moniker, we can use Pinophyta, Coniferophyta, or Coniferae.

Detailed explanation-3: -Gymnosperms are known as evergreen plants because they do not shed their leaves. They shed only those leaves which are old and least productive. Leaves of gymnosperm remains with the plant for three to five years before they shed their leaves. Therefore they are evergreen.