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name for it is Philadelphus insignis. This hybrid is one of the hand- 
somest of all the tall-growing Syringas, and its value is increased by 
the fact that it is one of the latest of them all to flower. In a few 
old gardens in the neighborhood of Boston great Syringa-bushes occa- 
sionally thirty feet high and correspondingly broad are sometimes found. 
These plants are believed to be hybrids between P. coronarius and 
some unrecognized species. They are called Philadelphus maximus. 
Another hybrid, P. splendens, sprang up in the Arboretum several 
years ago and is supposed to be a hybrid between two American spe- 
cies, P. inodorus and P. pubescens. It is a large and shapely shrub 
with pure white only slightly fragrant flowers an inch and three-quar- 
ters in diameter and borne in erect clusters. Philadelphus splendens 
usually flowers very freely and when the flowers are open it is the 
showiest plant in the Syringa Group. It is not, however, as thickly 
covered with flowers this year as usual. 
Lemoine Hybrid Philadelphus. These are among the most beautiful 
and interesting additions to summer-flowering shrubs, due to the intel- 
ligence and skill of the great French plant-breeder. The first of these 
hybrids, Philadelphus Lemoinei, was obtained by crossing the European 
P. coronarius and the Rocky Mountain P. microphyllus. This plant is 
intermediate between its parents in size and in the size of the flowers. 
The flowers are pure white, very fragrant and produced in the greatest 
profusion. Lemoine then crossed his P. Lemoinei with other species 
and obtained remarkable results. By using P. pubescens or some re- 
lated species as the other parent he obtained a race to which the name 
P. cymosus has been given. The plant named “Conqujete” may be 
considered the type of this race. It is a vigorous, hardy plant with 
flowers from two to two and a half inches in diameter, and only sur- 
passed in size by those of “Rosace’' of this race, and a beautiful and 
desirable garden ornament. There is a good specimen in the 
Shrub Collection. Other plants of this race are “Mer de Glace,’’ 
“Norma,’’ “Nuee Blanche,’’ “Rosace,’’ “Voie Lacte’’ and “Perle 
Blanche.’’ By crossing P. Lemoinei with the hybrid P. insignis Le- 
moine obtained the race to which the general name of P. polyanthus 
has been given. Well known forms of this race are “Gerbe de Neige’’ 
and “Pavilion Blanc.’’ Another of these hybrid races created by Le- 
moine is called “P. virginalis;’’ of doubtful origin it is distinguished 
by double racemose flowers. The type of this group is “Virginal,” and 
other varieties referred to it are “Argentina,” “Glacier,” and “Bouquet 
Blanc.” 
Crataegus Phaenopyrum, the Washington Thorn, better known per- 
haps as C. cor data, is a member of the small group of Macrocarpae, 
distinguished by the principal veins extending to the sinuses of the 
leaves as well as to the points of the lobes, flowers with twenty sta- 
mens, rose-colored or yellow anthers and red fruit not more than a 
quarter of an inch long. To this group belong in addition to the three 
species of the southern United States the two common species of west- 
ern Europe, C. oxycantha and C. monogyna, now often cultivated in 
this country in many forms. Crataegus Phaenopyrum is a tree up to 
thirty feet in height with a trunk a foot in diameter, and erect branches 
