boughless

from WordNet (r) 3.0 (2006)

boughless
    adj 1: having no boughs (of trees)

from The Collaborative International Dictionary of English v.0.48

boughless \boughless\ adj.
   1. having no limbs. Opposite of {limbed}.

   Syn: limbless.
        [WordNet 1.5]

   2. lacking a bough or boughs. Opposite of {boughed}.
      [WordNet 1.5]