lOQ WAYSIDE AND WOODLAND BLOSSOMS. 



Blackthorn, or Sloe (Prunus communis). 



It seems quite natural to use the two common names of this 

 beautiful shrub at different times. In the spring, before a leaf 

 has unrolled upon the spine-tipped spurs of its soot-coloured 

 branches, we call it the Blackthorn, for by contrast with its 

 pure white stars its thorns are black indeed. In the autumn, 

 when we search the common, the copse-side and the thick 

 hedgerow for ripe bramble fruit, we only know it as the Sloe. 

 Then the plant is again in full beauty with its groups of round 

 plums, each finely coated with the purple bloom that is ruined 

 by a touch. Like the Whitethorn (page 17) and the Bramble 

 (plate 30), the Blackthorn is a rose, with the floral organs in fives. 

 The fruit is botanically a drupe : it is the result of a swelling 

 up of the ovary, the outer walls of which become succulent 

 and pulpy, the inner hardened into the " stone" inclosing the 

 "kernel" or seed. The leaves are small, elliptical, finely 

 toothed, and in a young state the underside is downy, but in 

 the adult condition smooth. All the branches are spiny. 



There are two forms with brown bark which have been at 

 various times regarded as separate species, or as mere varieties, 

 but which Sir J. D. Hooker ranks as sub-species, marking a 

 stage in which varietal characters have become permanent, but 

 not sufficiently strong to hide their connection with the parent 

 form. These are : 



I. The Bullace <P. insititia), with larger and broader leaves, underside downy 

 in the adult condition ; branches straight, only a few with spines ; the petals 

 broader ; the fruit more drooping, black or yellow, larger, and less rough to the 

 taste. 



II. Wild Plum (P. domestica). Branches straight without spines. Fruit larger, 

 black. Leaves downy on the ribs of the underside. The plums of the fruiterer and 

 the " prunes " of the grocer are cultivated forms of this species. 



They all flower in March and April. The name is the old Latin appellation for 

 the fruit. 



