THOUGH “the abominable mystery,” as Darwin called the problem of the origin of Flowering Plants, is by no means ... as to the possibility of these main phyla having been even differentiated ...

The USNVC is a classification of “existing” vegetation based on the physiognomy and taxonomy of all plant communities. There are hierarchies for two distinct categories: natural vegetation (shaped ...

Classification attempts to impose a hierarchy ... It's a simple idea but when we're trying to work out how all the plants and animals in the world fit together and how we have ended up with ...