资料来源 : Webster's Revised Unabridged Dictionary (1913)

Joint-fir \Joint"-fir`\, n. (Bot.)
   A genus ({Ephedra}) of leafless shrubs, with the stems
   conspicuously jointed; -- called also {shrubby horsetail}.
   There are about thirty species, of which two or three are
   found from Texas to California.