142 The Trees of Great Britain and Ireland 



5. Sopbus. Ovary with 3 or 5 cells, styles free. Fruit crowned by the calyx, 



endocarp membranous or coriaceous. Leaves pinnate. Includes two sub- 

 sections : 



Aucuparia, with 3-celled ovary and small globular fruit, and 

 Cormus, with 5-celled ovary and large pear- or apple-shaped fruit. 



6. Aria. Ovary with 2 to 5 cells, styles free. Fruit crowned by the calyx, endo- 



carp membranous, flesh granular. Leaves simple. Includes the whitebeam 

 and its allies. 



7. Micromeles. Ovary with 2 to 3 cells. Fruit small, globose, umbilicate, endo- 



carp membranous or coriaceous, calyx-lobes deciduous. Leaves simple. 

 Includes several Asiatic species. 



Synopsis of the Principal Species in Cultivation exclusive of 



Pears and Apples. 



(Cf, Plates 43-45. where leaves of most of the species are shown,) 



I. Leaves regularly pinnate, the leaflets being separate and never decurrent by their 

 bases on the rhachis. 



A. Aucuparia. Mountain ashes. Leaflets unequal-sided at the base. Fruit small, 



not exceeding \ inch. 



(1-3) Winter buds white-tomentose. 



1. Pyrus Aucuparia, Gaertner. Europe, Northern Asia, Japan. Young 



branchlets and leaves pubescent, adult leaves glabrous or only slightly 

 pubescent beneath. The common mountain ash. 



2. Pyras lanuginosa, DC. South-eastern Europe. Only differs from the 



preceding in the adult leaves being densely woolly beneath. 



3. Pyrus thianschanica, Regel. Chinese Turkestan. Young branchlets 



and leaves glabrous ; adult leaves quite glabrous beneath and con- 

 spicuously veined on the upper surface. 



(4-5) Winter buds shining, glutinous, glabrous or sparingly pubescent, the 

 pubescence oppressed and of a rusty colour. 



4. Pypus americana, Torrey and Gray. North America. Leaflets long, 



narrow, acuminate, glabrous beneath. 



5. Pyrus sambucifolia, Chamisso and Schlechtendal. Manchuria, North- 



East Asia, Japan, North America. Leaflets broader than in No. 4, 

 obtuse or acute (not acuminate), more or less pubescent beneath. 



B. Cormus. True Service. Leaflets nearly equal sided at the base. Fruit large, 



\ inch diameter or more. 



