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become light pink. The third Lilac, raised here in 1882 from Dr. 
Bretschneider’s seeds, Syringa pekinensis, had been discovered and de- 
scribed as early as 1859, and was growing in Paris before it was raised 
in the Arboretum. It is a large tree-like shrub with wide-spreading 
and drooping branches, and short unsymmetrical clusters of white 
flowers. 
No additional species of Syringa was added to the Arboretum collec- 
tion until 1902 when the introduction of eastern Asiatic species recom- 
menced and during the next fifteen years the following Chinese and 
Korean species were obtained: S. Koehneana, 1902, S. affinis, 1904, 
S. affinis Geraldiana, 1906, S. Woljii, 1906, S. tomentella, 1907, S. Jul- 
ianae, 1907, S. Meyeri, 1908, S. Sweginzowii, 1910, S. pinnatifolia, 
1911, S. rejlexa, 1911, S. Sargentiana, 1911, S. microphylla, 1913, 
S. yunnanensis, 1915, S. velutina, 1917, S. dilatata, 1917, S. formos- 
issima, 1917, S. Palibiniana, 1917. Varieties of the common Lilac 
crossed by Lemoine with the north China S. affinis var. Geraldiana 
have founded the fourth race of hybrid Lilacs. Varieties of this hybrid 
are tall, fast growing plants with large clusters of unusually fragrant 
flowers. Of the new species of Lilac introduced by the Arboretum 
during the last twenty years the most promising as garden plants are 
Syringa Sweginzowii, S. Julianae, S. rejlexa and S. Woljii. S. Sweg- 
inzowii is a narrow shrub with slender erect branches and long narrow 
clusters of slightly fragrant flowers, with a slender corolla-tube, 
flesh-colored in the bud and becoming nearly white after the flowers 
open. This plant blooms freely every year and the flowers are pro- 
duced in great profusion. Its relationship is with S. puheseens but it 
is a smaller shrub; the flowers are less fragrant, and usually ten or 
twelve days later. S. Julianae is also related to S. pubescens and has 
the same shaped flowers with long narrow corolla tubes, but although 
fragrant the flowers are less fragrant than those of that species and 
are produced in shorter clusters. The beauty of the flowers is increased 
by the contrast between the violet-purple color of the outer surface of 
the corolla and the white inner surface of its lobes. S. rejlexa resem- 
bles S. villosa in size, habit and foliage, and differs from other Lilacs 
in its narrow pendent flower-clusters. S. Woljii is a native of Mon- 
golia or northern Korea and is still little known either as a wild plant 
or in gardens. It reached the Arboretum in 1906 from St. Petersburg 
where it had been sent by the Russian traveler and botanist Komarov. 
The foliage resembles that of S. villosa but the flowers are produced 
in much larger clusters and are smaller and violet-purple; in color they 
resemble that of the flowers of the hybrid Lilac Lutece but they are 
smaller and in denser clusters than those of that plant. When Syringa 
Woljii is better known it will probably be considered one of the hand- 
somest of this group of late-flowering Lilacs. 
Lovers of Lilacs can now see growing in the Arboretum twenty-five 
species of Lilacs, the four hybrids and their forms, and some two hun- 
dred varieties, raised chiefly in France and Germany, of the common 
Lilac. Three or four species found in remote parts of China, and de- 
scribed by botanists, have not yet been introduced into gardens, and 
