38 
the parentage of any of the Rugosa hybrids with the exception of the 
two which have been created in this Arboretum. One of the earliest 
of the Rugosa hybrids, Madam George Bruant, has pure white semi¬ 
double flowers which continue to open until the coming of frost. More 
distinct is the plant named Conrad Ferdinand Meyer which was raised 
in Germany. This is a large shrub, with large, nearly double, clustered 
pink flowers. The foliage and flowers show little Rugosa influence, 
but its vigor and hardiness are probably derived from the Japanese 
parent. Nova Zembla is a white-flowered sport of this Rose. At least 
twenty other European hybrids of Rosa rugosa have received names. 
Some of these are not distinct and others have little to recommend 
them as garden plants. One of the handsomest and most distinct of 
these hybrids was raised several years ago by Paul & Sons of Cheshunt, 
England, by whom it was named Rosa rugosa repens alba. This plant 
has the foliage of Rosa rugosa, large flowers with petals between 
which there is more space than in the typical flowers of Rosa rugosa , 
and long, stout, prostrate stems. In England standards with weeping 
branches have been successfully grown by budding this Rose on the 
tall stems of other Roses, and it would probably prove one of the 
hardiest standard Roses which could be grown here. It can be trained 
over a fence or arbor, but can be best used to cover banks and the 
ground under other shrubs or small trees. The Japanese Rosa Wich- 
uraiana was at one time largely used as a ground cover in the Boston 
Parks, but it has not always proved hardy, and Rosa rugosa repens alba 
is a better ground cover in this climate. This Rose has been growing 
in the Arboretum for several years and has now been planted on the 
fence close to the entrance to the Arboretum nursery on Prince Street. 
The two Rugosa hybrids raised by Dawson at the Arboretum have 
proved to be good garden plants. In habit Lady Duncan resembles 
R. rugosa repens alba but the stems are not as stout; it can be used 
as ground cover or trained on an arbor or trellis. The flowers are 
rather smaller than those of R. rugosa and pure pink, and the leaflets 
are smaller and very lustrous. This Rose was obtained by crossing 
Rosa rugosa with R. Wichuraiana. The Arnold Rose, R. Arnoldiana, 
was made by Dawson, by crossing R. rugosa with the hybrid Tea Rose, 
General Jacqueminot. It is a stout bush with good foliage and large, 
bright red, single flowers, and when in bloom perhaps the showiest 
of the Roses in the Shrub Collection. 
Deutzias. The climate of eastern Massachusetts is too severe for 
the successful cultivation of many of the handsomest of these plants 
which flower much better in the middle states and in Rochester, New 
York, than they do in the Arboretum. The mild winter has favored 
them, however, and several of the Chinese species have been flower¬ 
ing here in a way which shows what valuable garden plants they may be 
when climatic conditions suit them. The Deutzia which has proved 
perfectly hardy in the Arboretum in nearly thirty years of trial, the 
North China D. parviflora, is not one of the handsomest species, but 
crossed with the Japanese D. gracilis it has produced D. Lemoinei 
which has inherited much of the hardiness of its Chinese parent and 
proved to be an excellent garden plant here. It is a shrub sometimes 
