XIV] COLOURS OF TWIGS 109 



peculiarly patchy or checkered greys of various shades in 

 the Plane and Guelder Rose. 



Yellowish greys are met with in Clematis, Guelder 

 Rose, Larch, Bittersweet and Lilac, and 



Greenish greys in Hornbeam, Oak, White Poplar, 

 Plane, Ash, and Salix pentandra\ passing to 



Olive-greys in the Aspen, Black Poplar, Populus 

 canadensis, Privet, Ash and Walnut. 



Brown-greys occur in Daphne Mezereon, Hazel, Pear, 

 Symphoricarpos, Elder, Beech and Ribes nigrum ; also in 

 Pyrus torminalis and Horse-chestnut. 



Dark slaty greys to nearly black-greys are met with 

 in Alder, Aspen, Rowan, Lilac, Hornbeam, Elm, Morns 

 nigra, Chestnut, Sycamore, &c. 



Reddish greys often characterise the twigs of Acer 

 platanoides, Hawthorn, Larch, Salix alba and Pinus syl- 

 vestris ; while the greyish twigs of the Spindle Tree often 

 have a violet cast over them. 



Pure yellows are not common, but the twigs of the 

 Golden Osier are bright cadmium or chrome yellow, like 

 yolk of egg, and the yellows of Populus nigra, P. cana- 

 densis and Salix repens are sometimes striking, though 

 like those of Salix fragilis and Abies pectinata generally 

 duller. 



But tawny or leather yellows, varying much as do the 

 tints of leather straps and travelling bags, are by no 

 means rare, and occur in the twigs of Acer campestre, 

 the Sycamore, Larch, Wayfaring Tree, White and Crack 

 Willows, Honeysuckles, Black and Canadian Poplars, 

 Barberry, Elder arid Sambucus racemosa ; while twigs of 

 Ulmus campestris and of Pinus sylvestris incline to orange 

 or reddish yellows. 



Brown-yellows are found in Sycamore, Salix viminalis, 

 the Vine, Ampelopsis and Barberry. 



