DENDROLOGY

Detailed explanation-1: -The first land plants appeared around 470 million years ago, during the Ordovician period, when life was diversifying rapidly. They were non-vascular plants, like mosses and liverworts, that didn’t have deep roots.

Detailed explanation-2: -At present, fossil evidence of land plants dates to the Ordovician Period (about 485.4 million to 443.8 million years ago) of the Paleozoic Era.