48 
The best known of the shrubby Hydrangeas and the first to flower is 
H. Bretschneideri, a native of northern China and first raised at the 
Arboretum in 1883. It is a large, vigorous and hardy shrub with dark 
green leaves and every year is covered with its flat heads of flowers 
surrounded as in the other species with sterile white ray flowers. Sev- 
eral of the Hydrangeas discovered by Wilson in western China also 
flower in June and can be seen on the southern slope of Bussey Hill 
and on Hickory Path near Centre Street. H. Rosthornii is now the 
tallest and probably the most vigorous here of these plants. H. xan- 
thoneurea and its varieties Wilsonii and setchuenensi^, although closely 
resembling in their general appearance H. Bretschneideri, are inter- 
esting additions to the June flowering shrubs. 
Rosa Virginiana (often called R. lucida), the seashore rose of New 
England, has been largely planted by the roadsides here and adds much 
to the beauty of the Arboretum in June. A plant which came here 
years ago from the island of Mt. Desert on the coast of Maine and now 
distinguished as var. lamprophylla is a handsomer plant than the typi- 
cal form of R. virginiana, of denser habit and with darker green lustrous 
leaves. The large pink flowers and the showy red hips are similar to 
those of the common form. 
Late Roses. Some of the Roses still to flower are the Japanese Rosa 
Wichuriana, which in this climate blooms best when the long trailing 
stems are allowed to lay flat on the ground, the Korean Rosa Jackii, 
a plant with semiprostrate stems much like Rosa multijiora in general 
appearance but with larger and later flowers, the Chinese R. caudata, 
a large, strong growing shrub with broad clusters of flowers two inches 
in diameter, their pink petals marked with white near the base; and 
the American Prairie Rose {R. setigera) which is the last of the Ameri- 
can Roses to open its flowers with the exception of the New Mexican 
Rosa stellata which, already in bloom, will continue to open its large 
rose-colored flowers through the summer. There is also a Rose here 
brought recently from Sand Point, Idaho, probably R. pyrifera, which 
flowers in June and again in September. 
Viburnum Canbyi is now in flower. This is the largest, handsomest 
and latest of the blue-fruited Viburnums of eastern North America, and 
has grown to a large size in the Arboretum. Compact, round-topped 
specimens ten to fifteen feet high and broad can be seen near the 
Administration Building and by the Meadow and other Roads. This 
shrub is a native of eastern Pennsylvania and northern Delaware, and 
has been found in central Indiana. It is often considered a variety of 
V. venosum, now called V. pubescens, but it is a much larger plant 
than that species with larger flower-clusters and fruit. It blooms, too, 
two or three weeks later. As it grows in the Arboretum this Vibur- 
num is one of the splendid shrubs of eastern North America. 
Tripterygium Regelii. Climbing plants with handsome foliage and a 
conspicuous inflorescence easy to grow and hardy in New England are 
not too numerous, and Professor Jack’s introduction several years ago 
from Korea of Tripterygium Regelii made an important addition to 
the number. It is in bloom in the Shrub Collection. 
