726 



ARBORETUM AND FRUTICETUM. 



PART III. 



431 



432 



Spec. Char., tyc. Leaves roundish, lobed, crenated, gla- 

 brous, reticulately veined. Flowers in umbel-like 

 corymbs. Sepals ascending. Carpels glabrous. A 

 native of the alps of Altai. (Dec. Prod., ii. p. 543.) 

 Introduced in 1801 ; growing to the height of 1 ft. or 

 2 ft. ; and producing its abundant flowers in May. 

 This species is very handsome, with branches spread- 

 ing horizontally, and bearing, in the flowering season, 

 numerous compact corymbs of pure white flowers ; 

 which, combined with the neat appearance of the 

 plant, and its glaucous leaves, rounded in their out- 

 line, and yet lobed, render the species a very inte- 

 resting and ornamental one. 



* 11. S. ALPI'NA Pall. The Siberian alpine Spiraea. 



Identification. Pall. Fl. Ross., 1. p. 82. t. 20.. according to Camb Monog. : Dec Prod , 2. p 543 ; 



Don's Mill., 2. p. 518. 

 Engravings. Pall. Fl. Ross., 1. t. 20. ; and our fig. 432. 



Spec. Char., fyc. Leaves lanceolate-oblong, ses- 

 sile, serrulated, glabrous \ the midrib pinnately 



branched. Flowers in terminal, stalked, and, 



in many instances, leafless, corymbs. Sepals 



ascending. (Dec. Prod., ii. p. 543.) A native 



of the wooded alps of Siberia ; introduced 



in 1806 ; growing to the height of from 4 ft. 



to 6 ft. ; and flowering in June. Its flowers 



are white. 



Remark. A kind of pirae N a is extant, in some 

 English collections, under the name of S. alpina; 

 which must be very distinct from the above, as 

 it has its flowers in lateral umbels, in the mode 

 of S. Aypericifolia, to which, in its leaf, it also 

 assimilates. It does not resemble that species in being of upright growth; 

 nor is it so tall ; but it is dwarfer, and spreadingly branched. Its flowers 

 are produced in April, almost before the leaves, and perhaps earlier than 

 those of any other kind of *Spirae v a in British collections : they are not white, 

 as those of S. ^ypericifolia, but of a yellowish or greenish white. Plants of 

 this kind were raised from exotic seeds, in the Cambridge Botanic Garden, 

 before 1824. J. D. 



& 12. S. HTPERICIFO^LIA Dec. The Hypericum-leaved Spiraea. 



Identification. Dec. Fl. Fr., 5. p. 645. ; Prod., 2. p. 543. ; Don's Mill., 2. p. 519. 

 Synonymes. //ypericum frdtex llort. ; Italian May. 

 Engraving. Our fig. 433. 



Spec. Char.y fyc. Leaves obovate-oblong, 3 4-nerved, 

 entire or toothed, glabrous, slightly downy; primary 

 veins pinnately branched. Flowers in either peduncled 

 corymbs, or sessile umbels. Pedicels glabrous, or slightly 

 downy. Sepals ascending. A native of Europe and 

 America. A species that presents diversified appear- 

 ances. (Dec. Prod., ii. p. 543.) Supposed by some to 

 be a native of Canada ; but Dr. Hooker thinks that, like 

 most of the species of the section to which it belongs, it 

 is only to be found wild in the Old World. 

 Varieties. Seringe has characterised 6 forms of this species, which he 

 describes as follows : 



S. h. 1 uralensis Ser. S. crenata Lin., Fisch. in Litt., and Don's Mill., 



ii. p. 519. ; S. /jypericifolia Camb. Monog. Branches rigid, thickish. 



Leaves ovate-rounded ; the whole margin crenated. A native of the 



Ural Mountains. 



* S. h. 2 Plukenetiana. Ser. S. //ypericifolia Lin. Sp., 701., and Don's Mill., 



