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Laburnum alpinum, a native of the mountainous regions of southern 
Europe but in England often called the Scotch Laburnum, is a hardier 
plant than L. anagyroides. It is more often a large shrub than a tree, 
although it is occasionally treelike in habit. It blooms usually ten days 
later and the flower-clusters are larger and narrower, j A hybrid between 
these two species of garden origin known as L. Watereri and as L. 
Parksii has the treelike habit of L. anagyroides and the long slender 
flower-clusters of L. alpinum. This tree is very hardy and the hand- 
somest tree with yellow flowers which is hardy in this climate, as L. 
alpinum is the handsomest large shrub with yellow flowers which can 
be grown here. 
Laburnum Adami is a hybrid between L. anagyroides and Cytisus 
purpureus with the habit and foliage of the former, and dull purple 
or rarely yellow flowers. It is more curious than beautiful. The other 
species of Laburnum, L. caramanicum, is a small shrub from Asia 
Minor with long, slender, erect, terminal clusters of small flowers and 
is not hardy here. 
Neillia sinensis. This is the only member of a genus of the Rose 
Family related to Spiraea which has flowered in the Arboretum. It 
is a native of western China, and is a tall, hardy shrub with slender 
gracefully spreading and drooping branches, light green, incisely cut, 
pointed leaves from an inch and a half to two inches long, and clear 
pink flowers about half an inch in length, in short terminal racemes. 
This is one of the handsomest and most interesting of the hardy shrubs 
introduced by Wilson from western China. The largest plants are on 
the upper side of Hickory Path, near Centre Street, and there are 
plants also in bloom in the Chinese Collection of Shrubs on the south- 
ern slope of Bussey Hill. Two other pink-flowered species introduced 
by Wilson, N. longiracemosa and N. affinis, have not flowered yet in 
the Arboretum and appear to be less hardy than N. sinensis. 
Scotch Roses. A plant of the Burnet or Scotch Rose {Rosa spino- 
sissiina) as it is often called, with its prickly stems, small leaves, 
white flowers and globular black fruits can be found in most old-fash- 
ioned northern gardens for it is a very hardy plant resistant to abuse 
and handsome when its spreading branches are covered with flowers 
which unfortunately last but a short time. A variety of this plant 
from southern Siberia (var. altaica or grandijiora) is a larger plant 
with larger flowers faintly tinged with yellow, and one of the hand- 
somest of all single-flowered Roses which can be grown in this climate 
where it can make a dense bush six or seven feet high and broad. 
This plant produces great numbers of suckers by which it can be 
easily increased. The variety hispida is a tall growing plant with erect 
stems and yellow flowers from two and a half to three inches in 
diameter. Var. fulgens has pale pink flowers and the variety lutea 
pale yellow flowers. From the garden of the Duke of Buccleuch at 
Dalkeith, near Edinburgh, the Arboretum received a few years ago a 
collection of Scotch Roses for which this garden was once famous. 
A plant in this collection called Jupiter, with pale pink single flow- 
ers, and another called Lady Boilles with small pale yellow flowers are 
attractive and worth attention. The Scotch Roses are with the other 
species in the general Shrub Collection. 
