black·thorn /ˈblækˌθɔrn/
  李樹的一種,李木手杖
  Black·thorn n. Bot. (a) A spreading thorny shrub or small tree (Prunus spinosa), with blackish bark, and bearing little black plums, which are called sloes; the sloe. (b) A species of Cratægus or hawthorn (Cratægus tomentosa).  Both are used for hedges.
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  blackthorn
       n 1: a thorny Eurasian bush with plumlike fruits [syn: sloe, Prunus
            spinosa]
       2: erect and almost thornless American hawthorn with somewhat
          pear-shaped berries [syn: pear haw, pear hawthorn, Crataegus
          calpodendron, Crataegus tomentosa]