Acer 635 



rounded, short, obtuse or acute ; margin with small irregular teeth ; petiole 

 without latex. In var. neapolitanum, the leaves (Plate 206, Fig. 15) are more 

 obscurely lobed, with very dense long pubescence beneath. (See description, 

 p. 663.) 

 21. Acer grandidentatum, Nuttall. Montana southwards to New Mexico. 



Leaves (Plate 205, Fig. 4) 3 inches long, 4 inches broad, with three large 

 oblong lobes, separated by sinuses extending half-way to the base of the blade ; 

 margin with a few large obtuse lobules, otherwise entire ; under surface covered 

 with pale dense pubescence ; basal lobes represented by the lowest pair of the 

 marginal lobules. 



A small tree, rarely forty feet in height, representing the sugar maple in the 

 West. There is a small specimen thriving in the Kew Collection. 

 "22. Acer rubrum, Linnaeus. North America. 



Leaves (Plate 207, Fig. 27) averaging 3 inches long and broad, variable in 

 shape ; under surface silvery white with scattered pubescence ; lobes usually 

 triangular, acute or acuminate, sharply toothed or bi-serrate in margin ; sinuses 

 acute at the base, variable in depth ; base of the leaf truncate or rounded, 

 rarely cordate. (See description, p. 671.) 



23. Acer tetramerum} Pax. Central China. 



Leaves 3 inches long, 2 inches broad, ovate, cordate at the base, indistinctly 

 five-lobed ; basal lobes obscure or obsolete ; lateral lobes short, triangular, acute 

 and sharply serrate ; terminal lobe with two or three pairs of serrated teeth, 

 and prolonged into a long narrow acuminate apex ; margin ciliate ; upper surface 

 dark - green, scattered pubescent ; lower surface pale, covered with white 

 pubescence, densest in the axils ; petiole without latex. 



A small tree, introduced by Wilson in 1901. Young plants at Coombe 

 Wood are perfectly hardy and free in growth, having already attained 16 feet 

 in height. 



IV. Leaves five-lobed ; basal lobes well-developed ; white or pale beneath ; petiole 



without latex. 



* Leaves not serrate. 



24. Acer Opalus, Miller. Southern Europe. 



Leaves (Plate 206, Fig. 14) 2\ inches long, 3 inches wide ; lobes short, acute, 

 irregularly toothed ; under surface with scattered pubescence, denser on the 

 nerves and forming axil-tufts. (See description, p. 663.) 



25. Acer saccharum, Marshall. North America. 



Leaves (Plate 206, Fig. 12) 5 inches long, 6 inches wide; lobes triangular, 

 acuminate, with one or two pairs of sinuate teeth ; lower surface with axil-tufts 

 of pubescence, elsewhere glabrous or more or less pubescent. (See description, 

 p. 677.) 



26. Acer hyrcanum, Fischer et Meyer. South-Eastern Europe, Crimea, Asia 



Minor, Caucasus. 



Cf. j. H. Veitch, /ourH. Roy. Hort. Soc. xxix. 353, fig. 97 (1904). 

 Ill 2 B 



