82 DWAEF AND 8L0W-GB0WING C0NIFEE8 



45 degrees. Branchlets very fine and densely crowded. 

 Annual growth J to | inch ; glabrous white-yellow. Leaves 

 radial, pointing forward at an acute angle. Quadrangular, 

 stout, incurved, or straight with usually rounded carti- 

 laginous tip; stiff, about fV inch long, emitting strong 

 unpleasant odour when crushed. Very glaucous blue- 

 green; about three stomatic lines on each side. 



A dense flat-topped dwarf bush of ascending branches 

 and branchlets. Very distinct on account of its unusually 

 glaucous light blue- green foliage. It is of slow growth 

 and grows wider than high, forming a low cushion. My 

 best specimen is about 14 inches high and 32 inches wide. 

 This form of P. alba is now extremely rare. 



P. alba, Lk., var. Albertiana, forma conica, Rehder. 



Syn. : P. Albertiana, Stewardson Brown, var. conica. 



Buds ovate, minute, light brown, slightly resinous ; bud 

 scales ovate with entire apex. Terminal bud girt with a 

 ring of acuminate keeled scales with long points. 



Branchlets very fine and flexible, shining cream-yellow, 

 with pubescence usually in grooves between pulvini. 

 Annual growth J to 1 inch. 



Leaves relatively long — over J inch, very thin and fine, 

 but roundish ; arranged imperfectly radially and not very 

 close together ; fewer below, curved, uniform width, ending 

 in a cartilaginous point ; hght glaucous green, with two to 

 three stomatic lines on each side. 



A most distinct plant; foliage as fine as juvenile forms 

 of Thuya orientalis. The parent tree is in the Arnold 

 Arboretum. It was found in the Canadian Rockies at 

 Lake Laggan in 1904 by Mr. J. G. Jack, of the Arnold 

 Arboretum . According to E . H . Wilson {Garden Magazine, 

 September, 1920, p. 38), it is of narrow pyramidal growth, 

 with short close- set twiggy branches covered with 

 pellucid grass-green leaves, and much resembles Kochea 

 Scoparea ; it requires a moist, shady situation and protec- 

 tion from cold winds. 



