218 BRITISH BOTANY. 



those of the Mountain Ash^ but which there is no reason to be- 

 lieve was ever found wild in Britain, and certainly is not so with 

 us, though described as common in the Isle of Wight, our P. 

 torminalis having been uniformly mistaken for it, and the error 

 perpetuated by the similarity of names and unscrutinizing habits 

 of compilers. 



"The Wild Service-tree is not a native of either Scotland or 

 Ireland." 



P. Aria, Crantz. White Beam-tree. — e.b. 1858. l.c. 365. 

 A. 13. C. 40. Lat. 50-59°. Alt. 0-300 yds. Tem. 51-45°. 



Usually a taller tree than the preceding. Leaves white-cottony 

 helow in all stages, ovate or oblong, doubly or unequally toothed, 

 base tapering, nearly entire. Styles 2-3, hairy below. Fruit 

 roundish, pulpy Avhen ripe, of an acidulous taste. 



Hedges. Common on chalky hills. Perennial ; May. Fruit, 

 August, September. 



P. fennica, Kalm. P. pinnatifida, P. hybrida, Sm. 365 b. The 

 Hybrid Beam-tree. (Area, etc., not determined.) — Lower portion 

 of the leaves truly pinnate, pinnatifid in the centre, and doubly 

 and deeply serrated towards and at the apex. The divisions of 

 the leaves seem to be the sole characteristic difference between 

 this plant and P. Aria. — Isle of Arran. 



P. scandica, Fr. l.c 365 c. 



Leaves broadly lobed. Lobes triangular-ovate, toothed most 

 deeply about the centre of the leaf. Finely serrated at the base, 

 and one-fourth upwards, narrowly lobed from three-fourths from 

 the base to the apex. The lobed leaves appear to be the sole 

 distinction between this plant and P. Aria. 



Note. — Are not P. fennica and P. scandica cultivated varieties 

 of P. Aria, and consequently found in plantations and ' shrub- 

 beries ? 



ONAGRACE^, Juss. The Willow-herb Family. 



Chiefly herbaceous perennial plants, with simple and entire 

 or toothed leaves, and axillary, solitary flowers. Calyx united 

 with the ovary, and having a 4- parted or 4-toothed limb, either 

 caducous or persistent, valvular in prefloration. Petals 4, imbri- 

 cated, twisted in prefloration, rarely wanting. Stamens 8, rarely 

 4, inserted with the petals at the top of the calyx-tube. Anthers 



