88 



TREES OF THE NORTHERN UNITED STATES 



broadly spreading; fruit ripening very late. Alow (15 to 30 ft. high), 

 round-headed tree, with the twigs and smaller branches covered 

 with corky bark. Occasionally cultivated ; from Europe. 

 Var. variegatum has white blotched leaves. 



11. Acer palmatum, Thunb. (PALMATE-LEAVED 

 JAPAN MAPLE.) Leaves small, smooth, palmately 

 parted into 5 to 9 quite regularly serrated lobes. 

 Flowers in small umbels. A very low tree, almost 

 a shrub ; cultivated ; from Japan ; probably hardy 

 ( throughout. There are a great number of Japan 

 A. paim&tum. 'Maples, many of them probably varieties of this 

 species, others hybrids. The leaves of some are so divided and dis- 

 sected as to form merely a fringe or feather. In color they range 

 from pure green to the richest reds. 



12. Acer circinatum, Pursh. (ROUND-LEAVED 

 OR VINE MAPLE.) Leaves orbicular, with 7 to , 

 11 serrated, acute lobes, a heart-shaped base, 

 reddish-green color, and both surfaces smooth. 

 Corymbs of pui-plish flowers, small and hanging 

 on long peduncles ; appearing after the leaves. 

 Wings of the fruit diverging in a straight line. 

 A small tree or tall shrub, 10 to 30 ft. high, of 

 spreading habit, with smooth bark, and pale brown twigs; cultivated; 

 from the Pacific coast of North America. 



13. Acer Tartaricum, L. (TARTARIAN 

 MAPLE.) Leaves ovate, slightly cordate, 

 rarely lobed, serrated, light-colored, expand- 

 ing very early in the spring. Panicle of 

 greenish -yellow flowers erect, blooming 

 after the leaves have expanded. Wings of 

 the fruit parallel or sometimes touching. A 

 small tree, sometimes shrubby in growth, of 

 irregular form, with brown twigs ; rarely cul- 

 tivated ; from Europe. 



GENUS 26. NEGtJNDO. 



A. Tartdricum. 



Leaves pinnate, of 3 to 5 leaflets. Flowers rather 

 inconspicuous. Fruit a two-winged key as in Acer, in 

 drooping racemes. 



