358 THE CULTIVATED EVERGREENS 



region under consideration and only a number of Rhodo- 

 dendrons, a few species of Pieris, Leucothoe, Berberis, Ma- 

 honia, Buxus microphylla var. japonicay and Osmanihus 

 Aquifolium can be mentioned. 



On the Pacific Coast, with its more humid climate, cooler 

 summers and milder winters, the belt of the evergreen trees 

 extends much farther north, up to the fifty-first degree of 

 northern latitude; besides the native Arbutus Menziesii, 

 several foreign trees and large shrubs can be grown as far north 

 and possibly even farther. 



KEY TO THE LARGER BROAD-LEAVED EVERGREENS 



A. Arrangement of leaves opposite. 



B. Branchlets slender, 4-angled: leaves entire, obtuse, 

 c. Leaves broadest below or about the middle: branch- 

 lets usually pubescent Buxus sempervirens, 362 



cc. Leaves broadest above the middle: branchlets usually 



glabrous Buxus microphylla, 363 



BB. Branchlets stout, subterete: leaves spiny-toothed, 



rarely entire, pointed Osmanthus Aquifolium, 



AA. Arrangement of leaves alternate. [371 



B. Leaves pinnate: flowers yellow, in fascicled racemes at 

 end of the branches. 



c. Leaflets 5-9, lustrous above Mahonia Aquifolium, 361 



cc. Leaflets 9-15, dull above Mahonia Bealii, 362 



BB. Leaves simple. 



c. Branches with usually 3-parted spines: leaves spiny- 

 serrate: flowers yellow, in axillary clusters: fruits 

 bluish-black. 

 D. Leaf rather thin, indistinctly veined beneath, revo- 



lute at the margin, usually about M inch broad . . Berberis Gagnepainii, 360 

 DD. Leaf thick and firm, usually broader than 3^ inch. 

 E. Young branchlets yellowish and slightly 

 angled: leaves slightly reticulate beneath, 



to 2}/2 inches long Berberis Juliana, 361 



KE. Young branchlets reddish and terete: leaves 



distinctly reticulate beneath, to 4 inches long. . Berberis Sargentiana, 361 

 cc. Branches not spiny. 



D. Margin of leaves serrate, crenate or spiny- toothed. 

 E. All leaves spiny-toothed, rarely entire: fruit a 

 red berry: usually a tree. 

 F. Flowers and fruits on the young wood: leaves 



dull above Ilex opaca, 364 



FF. Flowers and fruits on last year's branchlets: 



leaves lustrous above Ilex Aquifolium, 363 



