allotment86: Blackthorn. Charles Rennie Mackintosh. 1910. Pencil and watercolour on paper 25.8 x 20.2 cm This is the spiny shrub Blackthorn or Sloe (Prunus spinosa), often found in hedgerows or scrubby areas. The drawing was made in Chiddingstone, four miles east of Edenbridge. source The Hunterian Gallery.