Definition of grass tree:
(n) :
(Australia) Any of various small trees of the family Xanthorrhoeaceae (especially of the genus Xanthorrhoea), having a thick trunk crowned with a dense tuft of pendulous, grass-like leaves.
(n) :
A New Zealand shrub of the genus Dracophyllum, that grows up to 12 m high and found throughout in drier climates and at higher altitudes, with slender erect or spreading branches. Rigid, leathery grass-like leaves are usually crowded towards the tip of the branchlets. Also called spiderwood.
(n) :
Richea pandanifolia (family Ericaceae, giant grass tree).
(n) :
Dracophyllum (family Ericaceae), a genus of about 100 species.
(n) :
Dasylirion longissimum (family Asparagaceae, Mexican grass tree)