Definition of ground pines:
(n) :
Any of several plants, none of which are true pines:
(n) :
Lycopodium, a genus of clubmosses in the family Lycopodiaceae, a family allied to the ferns, specifically:
(n) :
Diphasiastrum complanatum (syn. Lycopodium complanatum) (northern running-pine), a species of clubmoss native to dry coniferous forests throughout the holarctic region.
(n) :
Lycopodium obscurum (princess pine), native to eastern North America
(n) :
Lycopodium clavatum (stag's-horn clubmoss, running clubmoss)
(n) :
Ajuga, a genus of herbaceous flowering plants in the mint family Lamiaceae, with most species native to Europe, Asia, and Africa; also, specifically: