284 THE CULTIVATED EVERGREENS 



habit, with light colored, sometimes almost silvery-white foliage. Very 

 popular as a lawn tree and for dry climates one of the best of all spruces. 



Var. viridis, Regel (P. commutata, Hort., not Murr.). The typical form 

 with green leaves. 



Var. glauca, Beiss. Blue Colorado S. With bluish foliage. Var. caerulea, 

 Beiss. With bluish-white foliage. Var. argentea, Beiss. (var. pungens Kosteri, 

 Beiss. var. Kosteriana, Hort.). With bluish-white foliage. 



Var. Kosteriana, Mast. (P. pungens glauca pendula, Beiss.). With bluish- 

 white foliage and pendulous branches. 



Var. compacta, Rehd. A dwarf compact form; originated at the Arnold 

 Arboretum about 1877. 



22. P. montigena, Mast. Tree to 100 feet tall, with rather long horizon- 

 tally spreading branches ascending at the ends; branchlets yellow or pale 

 brown, hairy; winter-buds ovoid, acute, resinous, the lower scales of the ter- 

 minal bud acuminate and keeled: leaves quadrangular, slightly compressed, 

 rhombic in section, obtuse or acutish, curved, obtusely keeled above, M~H 

 inch long, with 2 white bands above, each with about 5 rows of stomata, those 

 beneath inconspicuous, with 2-3 rows each: cones cylindric-oblong, 3-4 inches 

 long, cinnamon-brown, with rhombic-ovate, thin, arose scales. Western 

 China. — Introduced by E. H. Wilson in 1908 to the Arnold Arboretum where 

 it has proved hardy. 



23. P. Balfouriana, Rehd. & Wils. Tree to 120 feet tall, with short hori- 

 zontal branches; bark gray, deeply furrowed into thick irregular plates; 

 branchlets densely villous, yellowish or yellowish-gray, with spreading 

 villous petioles -^V inch long; winter-buds broadly ovoid or conical, brown, 

 slightly resinous, with appressed scales: leaves quadrangular, compressed, 

 straight or slightly curved, acutish or obtuse, -§— f inch long, with 2 white 

 bands above, those beneath inconspicuous and with only 1-4 rows of stomata: 

 cones ovoid-oblong, 2j^-33^ inches long, violet-purpl-e; scales brownish on 

 back, striate toward the apex, flexible, rhombic-ovate, often contracted 

 below the apex and produced into a point, erose above the middle and usually 

 laciniate and wavy. Western China. — Introduced in 1910 by E. H. Wilson 

 to the Arnold Arboretum where it has proved hardy and seems promising. 



24. P. purpurea, Mast. Tree to 60 feet tall, with wide-spreading branches; 

 bark dark gray, fissured and separating in thin scales; branchlets orange- 

 yellow, densely pubescent, with short spreading petioks; winter-buds broadly 

 ovoid, resinous, with appressed scales: leaves quadrangular, more or less 

 compressed, curved, obtuse or acutish, with 2 white bands above, green 

 beneath, usually with 2 incomplete rows of stomata, ]/s~}/2 inch long: cones 

 cylindric-oblong, 2-23^^ inches long, purple, more or less so even at maturity; 

 scales rhombic-oblong, contracted, narrowed from about the middle, erose- 

 denticulate, acutish or truncate at the apex. Western China. — Introduced 



