Acacia colletioides

from The Collaborative International Dictionary of English v.0.48

Wait-a-while \Wait"-a-while`\, n.
   (a) One of the Australian wattle trees ({Acacia
       colletioides}), so called from the impenetrability of the
       thicket which it makes.
   (b) same as {Wait-a-bit}.
       [Webster 1913 Suppl.]