NEW SERIES VOL. I 
NO. 8 
ARNOLD ARBORETUM 
HARVARD UNIVERSITY 
BULLETIN 
OF 
POPULAR INFORMATION 
JAMAICA PLAIN, MASS. JUNE 14, 1915 
Yellow-flowered Roses. Among wild Roses with yellow flowers are 
a few hardy plants which are not often seen in American gardens. 
There are five species of single yellow-flowered Roses which are found 
only in the region from the Caucasus to the Himalayas, in central Asia 
and in western and northern China. Among all the Roses of North 
America, Europe (except the Caucasus), Siberia and Japan, there is 
not a wild yellow-flowered Rose although some varieties of the Scotch 
Rose, R. spinosissima, have flowers more or less tinged with yellow, 
like the variety hispida, which has been covered with pale yellow 
flowers in the Shrub Collection this j^ear, and Harison’s Yellow Rose 
which was raised by Mr. George Harison of New York about 1830 
and is believed to be a hybrid between the Scotch Rose and the Aus- 
trian Briar. It is a very hardy, free-growing and vigorous plant, and 
never fails to produce large crops of pale yellow semi-double flowers. 
It was a very popular plant at one time in the northern states, and it 
is still found in most old-fashioned gardens. 
One of the yellow-flowered Roses, R. simplici folia, from Persia is 
not hardy. Of the four species which are hardy here Rosa Hugonis 
from western China is the earliest to bloom, and has been described 
in an earlier issue of these Bulletins. In the Arboretum the flowers 
are larger than those of the other yellow-flowered species and the 
plants are more vigorous and flower more freely. Judging by the 
plants in the Arboretum which have been growing here for several 
years this will be a valuable garden plant for the northern states. 
The next species to flower here, R. Ecae, is a very spiny shrub with 
small leaves and pale yellow flowers not more than an inch in diame- 
ter. It is a native of Afghanistan, where it is common on dry moun- 
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