September 9, 1916 



HORTICULTURE 



365 



recognized by American botanists. The 

 American hawthorns are widely dis- 

 tributed throughout eastern North 

 America. They are particularly 

 abundant along the streams and rivers 

 that run into Lake Ontario. I have 

 studied and collected them through- 

 out western New York, and Ontario, 

 Canada, from London to Ottawa and 

 down the St. Lawrence River as far as 

 Prescott. It is quite remarkable that 

 this vast array of species, in one 

 genus, all come true to seed. Observa- 

 tion has shown that the progeny of 

 the type species comes absolutely true 

 to the parents. When we consider that 

 Crataegus is close to some genera like 



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apples, pears, plums, and Amelan- 

 cheiers, that hybridize freely, this 

 phenomenon appears quite remark- 

 able. They are excellent subjects for 

 the planting of gardens and private 

 estates. They are very showy in bloom 

 in spring and early summer, and the 

 showy fruits, in varying tints of scar- 

 let, crimson and vermilion red which 

 extends throughout the different 

 species, from August to early winter, 

 make them splendid objects for land- 

 scape adornment. They are exceed- 

 ingly virile and hardy. 



I was asked by a prominent Ameri- 

 can landscape gardener, about two 

 months since, if I would name a dozen 

 showy species that would show repre- 

 sentative characters in habits, flowers, 

 and fruits, for landscape planting. I 

 confess that this is a hard problem 

 with such a vast number of species 

 and many of them of splendid merits. 

 I, however, submit twelve species that 

 are very ornamental and vary in habit 

 from trees of considerable size to 

 arborescent shrubs, and give a fine dis- 

 play of fruits from August to early 

 winter. I do not say that the follow- 

 ing are the best but that they are 

 highly ornamental: Crataegus Arnold- 

 iana, C. Arkansana, C. Dunbarii, C. 

 Durobrivensis, C. EUwangeriana, C. 

 fecunda, C. gloriosa, C. Jackii, C. 

 Laneyi, C. nitida, C. opulens, and C. 

 submoUis. 



D.wiDi.i. Davidia involucrata is a 

 remarkably handsome flowering tree 

 from north-western Szechuan and has 

 received the common name of Dove 

 Tree. It is described as having two 

 large, unequal, creamy white bracts 

 proceeding from the base of the flow- 

 ers, which are remarkably conspicuous 

 at a long distance. We have one in- 

 dividual over ten feet high which has 

 not flowered with us yet. I do not 

 think it has flowered in cultivation ex- 

 cept in France and in England. We 

 are extremely anxious to see it flower. 

 I am of the o|)inion that it resents 

 pruning. We have lost a few plants, 

 we believe, on account of this. Remov- 

 ing suckers or pruning to one stem as 

 we treat an elm. oak, or maple, we 

 think it resents. We shall leave it 

 alone hereafter and allow it to grow in 

 its natural manner. 



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