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Crataegus arkansana, which is a native of the bottom lands of White 
River, near Newport, Arkansas, was first raised at the Arboretum in 
1880. It is a tree some twenty feet high with a tall straight stem, a 
wide, rather irregular head and flowers an inch in diameter in broad 
clusters; like those of most of the western species they have twenty 
stamens and rose-colored anthers. The fruit is short-oblong to slightly 
obovoid, bright crimson, very lustrous, three-quarters of an inch in 
diameter and ripening late in October falls gradually during several 
weeks. This is perhaps the handsomest of the species with large, late- 
ripening fruit. There are plants in the Arboretum in the old Cratae- 
gus Group and on the left hand side of the South Street entrance to 
the Arboretum. 
Crataegus mollis is the common and best known species of this Group 
and grows on the bottom-land of streams in the region from northern 
Ohio and southwestern Ontario to northern Missouri and eastern South 
Dakota, Nebraska and Kansas. It is a round-topped tree often forty 
feet high, with a tall well formed trunk and spreading branches. The 
flowers, which are arranged in broad many-flowered clusters, have 
twenty stamens and yellow anthers. The fruit is nearly globose, scar- 
let, often an inch in diameter, and ripens late in August or in Septem- 
ber, and falls gradually. The largest plant in the Arboretum is by the 
right hand side of the South Street entrance. Further notes on Amer- 
ican Hawthorns as they flower will appear in later issues of these 
Bulletins. 
Rhododendron (Azalea) Schlippenbachii is in flower on the upper side 
of Azalea Path where two plants are now established. The pale pink 
fragrant flowers, which are about three inches in diameter and marked 
on one of the lobes of the corolla with red-brown spots, are perhaps 
more beautiful than those of any other Azalea, certainly of any Azalea 
which has proved hardy in the Arboretum. R. Schlippenbachii is one 
of the commonest shrubs of Korea and often forms the dominant un- 
dergrowth in open woods. From Korea it crosses into northeastern 
Manchuria where it grows on the shores of Possiet Bay; it occurs, too, 
in two localities in northern Japan. In Korea this Azalea on the wind- 
swept grass-covered cliffs of the coast grows less than a foot high but 
flowers abundantly. In the forests of the interior it often grows to a 
height of fifteen feet and forms a tall and slender or a broad and 
shapely shrub. The leaves are large for an Azalea, being from three 
and a half to four inches long and sometimes nearly three inches wide, 
and are arranged in whorls of five at the end of the branches. This 
plant grows further north than any other Azalea, with the exception 
of the North American Rhodora. The thermometer in the region of 
the Diamond Mountains usually registers every winter a temperature 
of 35° to 40° below zero Fahrenheit. There is therefore no reason why 
this Azalea should not flourish in the coldest parts of New England. 
Its hardiness and the beauty of its flowers make it one of the most 
valuable shrubs, if not the most valuable, which northeastern North 
America has obtained from northeastern Asia. This Azalea, however, 
is still rare in gardens. The seeds germinate freely, but the seedlings 
have proved difficult to manage, and many have been lost here in at- 
