366 ICOSANDRIA— PENTAGYNIA. Spiraea. 



Crataegus Aria. Linn. Sp. PI. 681 . Huds. 214. H. Dan. t. 302, 



Ehrh. PL Off. 375. 

 Mespilus n. 1089. Hall Hist. zj. 2. 31. 



M. alni folio subtus incano, Aria Theophrasti dicta. Baii Syn. 453. 

 Sorbus Aria. Crantz Stirp.fasc. 2. 46. t. 2.f. 2, 

 S. alpina. Bauh. Hist. v. 1. 65./. 

 Aria. Dalech. Hist. 202./. 

 A. Theophrasti. Ger.Em.l327.f. 

 jS. Pyrus intermedia. Elirh. Beitr. v. 4. 20. ^>b. 94. Willd. Sp. 



Pl.v.2. 1021. 

 P. hybrida. FL Br. 534. 

 Crataegus Aria /3. Linn. Sp. PI. 6S\, 

 Sorbus hybrida. Huds. 2 1 C. IVith. 461. 



In mountainous woods on a chalky soil, and the fissures of lime- 

 stone rocks. 



jS. On the walls of Castle Dinas y Bran, Denbighshire. Di: Pra- 

 iinton. 



Tree. May. 



A tree of a moderate size, whose young branches are very wiiite 

 and downy j the old bark reddish brown, and smooth ; the wood 

 very hard. Leaves on downy stalks, elliptic-oblong, doubly ser- 

 rated ; sometimes with several marginal lobes, which is the cha- 

 racter of /3, but not pinnatifid at the lower part as in the pre- 

 ceding ; the upper surface smooth, of a fine green ; the under 

 snow-white, and downy, marked with several straight, promi- 

 nent, transverse ribs, having correspondent furrows above. Sti- 

 pulas a slight, membranous, smooth dilatation, at each side of 

 the bottom of the footstalks, generally elongated into lanceolate 

 appendages, or real slipulas, which soon fall oif. Fl. white, in 

 large corymbose compound tirfts, with downy stalks. Bracteas 

 linear, smooth, deciduous. Styles 2, often 3 or 4. Fruit with 

 as many coriaceous cells, globular, scarlet, dotted, mealy, acid 

 and astringent. Seeds 2 in each cell. 



Ehrhart's authentic specimen of )3 accords with my Welsh ones, 

 differing from the common Aria in having rather deeper margi- 

 nal notches, or lobes ; but the I Yives are not truly pinnatifid. 

 Willdenow declares it to differ in its whole habit from P. Aria, 

 which I can find nothing to confirm. There can scarcely be 

 found a tree of the Aria on which some leaves do not answer to 

 this variety. 



253. SPIRAEA. Spiraea, Dropvvort and Mea- 

 dow-sweet. 



Linn. Gen. 253. Juss.339. Fl. Br. 535. Toimi.t. 389. Lam. 



t. 439. Gcortn. t. 69. 

 Filipendula. Tourn. t. 150. 

 Ulmaria. Tourn. ^ 141. 



