TREES OF THE CAMBRIDGE BOTANIC GARDEN. 



7 



made from material sent from Cambridge, apple-shaped fruit being 

 illustrated from Paris specimens, and pyriform fruit from M. J. Van 

 Volxem of Brussels. The tree was introduced to the Paris garden 

 by Father David about 1867. I saw it there against a wall in that 

 very hot walled depression where many good things have been grown, 

 and this, I dare say, suggested to me its present position at Cambridge, 

 and certainly it does justify the wall of my house, though it is 

 said to be hardy.* The leaves are pinnate, light green, and the flowers, 

 ij in. across, are white with rosy centres. It is native of North 

 China, and the seeds are eaten by the Chinese. They ripen here, 

 and have sometimes germinated where they fell. This specimen is 

 27 ft. 3 in. high. 



16. HlPPOPHAE SALICIFOLIA Don. 



This is a graceful and ornamental Himalayan tree. It has been 

 referred to Hippophae rhamnoides as a variety under the name angusti- 

 folia, but it grows much taller and is very different in appearance, 

 being more graceful and its leaves less silvery. The Cambridge tree 

 has been a very fine one, and, though it has now lost a considerable 

 branch, it still remains beautiful. In 1910 it was 42 ft. 10 in. high, 

 and 34 ft. through. Its height, four years after, is now 46 ft., 6 ft. 

 higher than the best record I find for it. It is one of those trees that 

 one regrets never to see planted. 



Group II. — Trees of Special Interest, including some 

 Fine Examples. 



17. Pinus monophylla Torrey (Elwes and Henry, v. 1056). The 

 One-leaved Nut Pine. (Fig. 8.) 



Though planted well within the last twenty years, I find that 

 this tree is looked upon as a good specimen. It grows in a very dry 

 climate, and is therefore perhaps better suited in this district than 

 in some others. In 191 1 it measured 7 ft. high, and in 1914 it was 

 9 ft. high. It is said to grow too slowly to be of use in a garden, but 

 this tree is thus increasing at the rate of 8 inches per annum. 



The best specimen known in this country is at Dunburgh House, 

 Beccles ; it is about 14 ft. high and bore a cone in 1908. Another 

 in Paul's Nursery, Cheshunt, was 13 ft. high in 1909. It is a hand- 

 some tree, and is of some economic importance, the seeds forming 

 an important article of food of the Indians of Nevada and California ; 

 they are highly esteemed by the white people, who eat them roasted. 

 They are | in. long and J in. wide. The timber is used for firewood, 

 and is largely used in the mines. This species is easily distinguished 

 by its monophyllous character. According to Dr. Masters, the 

 monophyllous character is due to the arrested development in the 

 bud of one leaf of a two-leaved cluster. The single leaf is perfectly 

 round and is like a very stout sewing needle. Occasionally the second 

 leaf is developed and a two-leaved cluster results. These two leaves 

 * [It is perfectly hardy at Wisley, Ed.] 



