the diverse forms of this leaf two .stand out as types, one with 

 six or eight lobes extending from the midrib, and the other with 

 but three lobes and these at the upper part of the leaf. So 

 marked is this latter form that the elder Michaux considered it a 

 separate species, to which he gave the name Q. triloba. Both 

 the turkey and Spanish oaks require two years to mature their 

 acorns. At present the one year old acorns are conspicuous on 

 the taller shrubs at the Navy Yard. Those of the turkey oak 

 are usually borne singly and those of the Spanish oak iji i)airs. 

 Both are on stems of about one quarter inch length. 



Post and white oaks. The post oak resembk^s the Spanish 

 in having its leaf lined with silky hairs but little otherwise. It 

 belongs to the group of white oaks, with rounded lobes and no 

 bristles, and its acorns mature in one year. This might also be 

 said of the white oak, from which the group takes its name, and 

 to which the post oak is closely related. The leaves, however, 

 are different. The post oak leaf has lobes which stand out 

 squarely at right angles to the midrib and are broader at the 

 outer ends. The lobes nearest the apex are largest. The white 

 oak's lobes are more uniform in size, and make an acute rather 

 than a right angle with the midrib. They taper from the body 

 of the leaf toward the rounded tip. The white oak leaf is also 

 smooth beneath, where the post oak has the silky hairs. The 

 white oak is the least abundant of the Navy Yard oaks. 



Of the nin(> species here mentioned all but the black oak and 

 the white oak are common; two, the live and the laurel, are 

 evergreen; two more, the willow and the water, are partially 

 evergreen; the remaining five are deciduous. Botanically, six, 

 the laurel, willow, water, turkey, Spanish, and black oaks, belong 

 to the bristle-tipped group — the red and black oaks. The white 

 oak group, without bristle-tips, claims the live oak, the post, and 

 the white. L. M. Bragg. 



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