- ground pine, Christmas green - any of several club mosses having long creeping stems and erect branches
--1 is a kind of club moss, club-moss, lycopod
--1 has particulars:running pine, Lycopodium clavitum; ground cedar, staghorn moss, Lycopodium complanatum; ground fir, princess pine, tree clubmoss, Lycopodium obscurum; foxtail grass, Lycopodium alopecuroides