15G MASS. EXPERIMENT STATION lU'LEETIN 267 



The Pijiu'LK Bakbeury, a variety of tlie foregoing, differs from the type 

 only in tiie purple color of its foliage and darker flowers; of little value for 

 planting. 



Betula ulhn peuJula, Euuofeax Weepixo Bntcn. Several fine specimens of 

 this popular cemetery tree formerly grew on the campus. Eike nearly all 

 other specimens of this kind they have been seriously depleted — almost com- 

 pletely annihilated — by the twig borer. At the j)resent time the growing of 

 this tree is so exceedingly difficult that it can be no longer recommended. 



Betula alba pendula dalecarlica, Dalecaklia Birch. A cutleaf form of the 

 European weeping birch which has also become almost exterminated by the 

 twig borer. 



Betula leitta. Sweet Busch. Sometimes called I5lack Bnicii. A good iiardy 

 native tree suitable for mass planting in woods but of no particular value on 

 lawns. J 



Betula lutea. Yellow Birch. A hardy native tree of the wild woods, most- 

 ly at home in high altitudes and cold northern situations, often in close mix- 

 ture with other hardwood and evergreen species. A striking and beautiful 

 tree but not adapted to lawn planting or other u.se outside its natural eco- 

 logical conditions. 



Betula pofjulifolla. Gray Birch. A common weed throughout New Eng- 

 land, especially abundant in dry pastures and abandoned fields. This never 

 makes a large tree but the small clumps are often picturesque and interest- 

 ing. It is distinctlj' desirable for the development of certain naturalistic ef- 

 fects in park planting. It prefers an acid soil. 



Bignonia radlcans, Trusipetcreeper. A strong-growing, vigorous, hardj', 

 coarse climbing vine, with striking yellow or orange blossoms, suitable for 

 growing over rustic trellises, outbuildings, or in other positions where a coarse 

 ranipant-grov\ing vine is desired. 



Buddleia davidi, Orange-eye Butterflybush. A small shrub valuable in 

 milder climates but not quite hardy on the college campus. 



Bu.vun sempervirens, Common- Box. Not safely hardy at Amherst, though 

 occasional specimens are found in the neighborhood where given special pro- 

 tection. Plants which from time to time have been set on the college grounds 

 have all disappeared, weakened by red spider and killed by hard winters. 



Bu.cus sempervirens suffruticosa, Truedwarf Box. This variety is thought 

 to be hardier than the species. About two hundred plants were set as a gar- 

 den edging on the grounds five years ago from which not a plant has been 

 lost. They have been given ligiit winter protection, however. 



('(dlirurpa purpurea, Chinese Beautyberry'. This shrub has been tested for 

 a number of years on the college campus and has proved to be not quite 

 iiardy. it kills back nearly every winter and sometimes severely. It is rather 

 an attractive shrub when growing well, the turquoise blue berries being espe- 

 cially interesting. 



Calycanthun fertilis, Sjiootii Sweetshrub. A good coarse-leaved shrub suit- 

 able for border planting. The dark maroon-colored flowers are pleasing but 

 not consi)icuous. Flowers of this particular species lack the strong aromatic 

 fragrance of other species of the same genus. 



Caraqana arburescens, Siberian Pea-tree. A tall shrub sometuiies reaching 



