652 The Trees of Great Britain and Ireland 



staminate, others mixed ; ovary in perfect flowers glabrous. Fruit ' with horizontally 

 spreading wings, glabrous or pubescent. 



In summer it is distinguishable from all the other small-leaved maples by the 

 leaves being ciliate in margin, with petioles containing milky sap. In winter the 

 corky ridges on older twigs are characteristic ; young branchlets are glabrous 

 or pubescent towards the tip, with crescentic three-dotted leaf-scars, which join at 

 their ends around the twigs. Terminal buds sessile, about ^ inch long, with scales 

 pubescent at the apex and fringed with white cilia. Lateral buds almost appressed 

 to the twigs. 



Varieties 



Two varieties occur in the wild state both in England and on the Continent ; 

 var. hebecarpum, in which the carpels of the fruit are pubescent, and var. leiocarputn, 

 with glabrous fruit. The leaves show considerable variation in shape and in the 

 amount of pubescence on the lower surface ; and six sub-varieties are distinguished 

 by Schneider,^ as follows : 



1. subtrilobum. Leaves three-lobed ; fruit pubescent. 



2. lobatum. Leaves with five obtuse, toothed lobes ; fruit pubescent. 



3. acutilobum. Leaves with five acute, almost entire lobes ; fruit pubescent. 



4. pseudomarsicum. Leaves three-lobed ; fruit glabrous. 



5. normale. Leaves with five obtuse, toothed lobes ; fruit glabrous. Var. 

 collinum is a form of this, with the leaves glabrous beneath. 



6. austriaca. Leaves with five acute, almost entire lobes ; fruit glabrous. 



In var. pulverulentum, as cultivated at Kew, the leaves are spotted with white. 

 This appears to be a very slow-growing tree. In var, variegatunt the leaves are 

 white in margin. 



A hybrid ^ between this species and A. monspessulanum has been found wild in 

 Herzegovina, and has been named A. Bornmillleri, Borb. A. neglectum, Lange, 

 described above in the Synopsis, p. 637, is a hybrid between A. campestre and 

 A. pictum, var. colchicum. 



Distribution 



Acer campestre is spread generally throughout Europe, with the exception of 

 the greater part of Scandinavia, Finland, Northern Russia, and the south of the 

 Iberian Peninsula ; and extends into Western Asia, where it is found in the 

 Caucasus and in the province of Astrabad in Persia, where it reaches its most 

 easterly and southernmost point. 



In Norway, according to Schiibeler, it is not indigenous ; but it lives as far 

 north as Trondhjem and grows as tall as 25 feet in the south. Its northern limit as 

 a wild tree, beginning in the province of Scania in South Sweden, crosses into the 

 province of West Prussia in Germany, where it grows at Thorn, and extends 

 through Poland and Central Russia to Vladimir, where it reaches its northernmost 



' A series of abnormal fruits, each with three to eight keys, instead of two, the normal number, is exhibited in the 

 Kew Museum. Cf. Sir W. Thiselton-Dyer in Ann. of Bol. xvi. 556 (1902). 

 ' Schneider, Laiibhohkundc, ii. 230, 231 (1907). 



