1336 The Trees of Great Britain and Ireland 



5. Picea polita, Carriere. Japan. See p. 1370. 



Branchlets yellow. Buds shining reddish brown, with closely imbricated 

 scales. Leaves rigid, stout, curved, ending in a spine-like point 



*** Leaves on lateral branches, imbricated on the upper side of the branchlet ; those 

 below, pectinate and spreading laterally in two sets. 



6. Picea alba, Link. North America. See p. 1380. 



Branchlets greyish or pale brown, usually glaucous. Buds with glabrous non- 

 ciliate bifid scales. Leaves disagreeable in odour when bruised, about 

 \ in. long. 



7. Picea bicolor, Mayr. Japan. See p. 1372. 



Branchlets yellow, glabrous on lateral branches, pubescent in the furrows on 

 leading shoots. Buds with scarious scales. Leaves, with two conspicuous 

 white stomatic bands, each of five to six lines, on the two dorsal sides, and 

 two bands of two lines on the two ventral sides. 



II. Branchlets 1 variable, quite glabrous or with slight scattered pubescence. 



8. Picea excelsa, Link. Europe. Seep. 1337. 



Branchlets reddish, usually quite glabrous, or with slight pubescence often 

 confined to the grooves between the pulvini. Terminal buds conical, acute, 

 without resin, girt with a ring of keeled pubescent ciliate pointed scales. 

 Leaves, usually f to 1 in. long, with two to three stomatic lines on each of 

 the four sides. 



9. Picea alberliana, Stewardson Brown. Alberta, British Columbia, Montana, 



Wyoming. See p. 1385. 

 Branchlets greyish yellow, either glabrous or with minute pubescence usually 

 confined to the pegs from which the leaves arise. Buds slightly resinous 

 with rounded entire scales. Leaves, in an imperfect radial arrangement on 

 the lateral branches, \ to 1 in. long. 



III. Branchlets always plainly pubescent. Leaves arranged on lateral branches, as in 



P. excelsa. 



* Terminal buds with a ring of conspicuous long subulate scales. 



10. Picea nigra, Link. North America. Seep. 1375. 



Branchlets covered with dense short glandular pubescence. Leaves bluish 

 or glaucous green, about \ in. long. 



11. Picea rubra, Link. North America. Seep. 1377. 



Branchlets, as in P. nigra. Leaves yellowish green or dark green, not 

 glaucous, ^ to I in. long. 



12. Picea Glehnii, Masters. Saghalien, Yezo. See p. 1369. 



Branchlets reddish, with short non-glandular pubescence, confined to the 

 furrows between the pulvini. Leaves slender, ^ to \ in. long. 



1 Cf. P. bicolor, No. 7, which has pubescent leading shoots and glabrous lateral branches. 



