CYPRESS: LING, ETC. 193 



() Leaves not revolute or grooved beneath ; 

 glandular on the back. Resinous tree. 



Cupressus sempervirens, L. Cypress. Conical tree, 

 with scale-like leaves, crowded and sessile in four ranks; 

 some broad-ovate or obovate-oblong, obtuse or mucronate 

 and fused below, but most of them short, scale-like, 

 rhomboid-oblong, or ovate-rhomboid, about 1 mm. long, 

 with a gland on the dorsal surface, grey-green. Venation 

 obsolete. Stomata on upper surfaces only. Leaf reddish 

 in winter. 



Leaves revolute and grooved beneath ; no 

 dorsal gland. Non-resinous sub-shrub. 



Calluna vulgaris, Salisb. Ling. Leaves very short 

 and small, opposite and decussate, sessile, slightly auricu- 

 late or spurred at the base, and closely imbricate ; linear 

 or linear-lanceolate, obtuse, 2 3 x O3 1 mm., convex 

 above, slightly grooved beneath, shining green and gla- 

 brous or glabrescent. Red-brown in autumn. 



(#) Leaves not scale-like or subulate, but ex- 

 posing distinct surfaces and with more 

 or less evident venation. 



* Leaves fleshy or leathery and thick ; 

 venation poor after the secondaries. 

 Evergreen. 



t Leaves narrow-oblong to obovate-lanceolate, 

 3 9 cm. long, obtuse : opposite or exception- 

 ally in whorls of 3. Yellowish green, and 

 somewhat fleshy. 



Viscum album, L. Mistletoe (Fig. 53). Rounded 

 bush with dichotomous shoots, yellowish green, and para- 

 sitic on various trees. Leaves 3 4 cm. x 10 15 mm., 



w. ii. 13 



