CH. VIll] ARRANGEMENT OF YOUNG LEAVES 59 



In the Willows the leaves in the bud are almost 

 invariably spirally arranged in the interior, though the 

 outer leaves may be distichous or opposite (Fig. 39). In 

 the Oaks the bud-scales are imbricated spirally, but so 

 as to form five ranks, a very characteristic feature, and 

 the leaves are spiral (Fig. 30). 



In the following the young leaves in the bud are 

 opposite and decussate : 



Mistletoe Maples 



Sycamore Honeysuckles 



Lilac Spindle Tree 



Dogwood Horse-chestnut 



Ash Viburnum 



Rhamnus catharticus Coffee. 



In the following the young leaves are distichous : 



Aristolochia Plane Magnolia 



Chestnut Hazel Cherry Laurel 



Lime Beech Hornbeam 



Camellia Virginian Creeper Vine. 



In the Ivy, Bilberry, Birch, and some others, they 

 commence by being distichous, but pass sooner or later to 

 a spiral arrangement. 



In the following the young leaves are spiral in bud : 



Broom Roses Arbutus 



Ailanthus Azalea Rhododendron 



Daphne Laurus Holly 



Walnut Mulberry Elms 



Prunus Avium Cherry Apple 



Pear Alder Fig 



Oaks Poplars Pines 



Firs Larch Cedar 



Willows (except Salix imrpurea). 



