85 



It is nearly five-nerved, that is, with veins parallel. 

 These veins are so strongly depressed on the upper side 

 that they are distinctly prominent below. In shape the 

 leaf is braoadly oval, generally rounded at the base, and 

 either rounded or sharp-pointed at the top. The buck- 

 thorn blooms usually in May, with small, greenish, four 

 parted flowers in scarcely noticeable clusters from the 

 axils of the leaves, and these develop into small, black 

 bitter berries which are ripe in September. At the tips 

 of the branchlets you will find an easy identification 

 sign for the buckthorn in the little thorn which ter- 

 minates them. 



Continuing south, you pass, on your right, another 

 handsome mass of large-flowered syringa, and west of 

 it white mulberry. A little southwest of the mulberry 

 you find false indigo, Amor p ha fruticosa. Near the 

 Walk, about opposite the lamp-post across the Drive, 

 you come to a broad branching buckthorn again. In 

 the corner of the Walk and the Bridle Path (the 

 northwesterly corner) stands a Scotch elm, and across 

 the Arch, at the southwesterly corner, European linden. 



At the next offshoot of the Walk, as you go south, 

 which leads out to Sixty-fourth Street, two trees stand 

 on the right and the left of the offshoot. They are 

 double-flowering Chinese crab-apple trees, and early 

 in the spring cover themselves with delicately tinted 

 pinkish double flowers in great profusion. Passing 

 on along the Walk as it draws you southward by the 

 Drive, about midway between the offshoot which crept 

 out west to Sixty-fourth Street and the next fork of 

 the Walk below, you meet Siberian pea tree, with 



