He paced up and down, heedless of where he trod, trampling the flowerless plants down into their black beds.

There has never been such a growth of flowerless plants as in the Paleozoic, and flowering plants probably culminated in the Miocene.

Of the Sigillariæ we cannot say as much with certainty, for botanists are not agreed as to what low order of flowerless plants they belong.