flowerless

Lichen: a kind of flowerless plant that grows on stones, trees, boards, etc.

I have brought to the hive, of which thou art queen, a bee I found lost on a flowerless road.

In a dim, still light we at last slowly descended out of the darker glade into a garden of grey terraces and flowerless walks.

They resembled both mosses and lycopods, which are flowerless cryptogamic plants of a low organisation.