68 NEW SYLVA. 



652. Spirea douglassi Hook, fl. Pubescent, 

 leaves elliptic apex serrate, white hairy be* 

 neath, panicle oblong, calix reflexed, capsules 

 smooth — N. W. America, flowers small, near 

 to Sp. tomentosa, no more different from it than 

 my removed deviations. 



653. Spirea menziesi Hook. fl. differs from 

 last only by leaves smooth beneath, yet made a 

 species by Hooker. 



Subgenus Chamedryon Ser. Dec. only differ- 

 ence flowers umbellate or corymbose, calix of* 

 ten nervose or venose. 



654. Spirea (Ch.) chamedrifolia L. Jaq. 

 and Europe. Smooth, branches cinereous su- 

 bangular, leaves petiolate obovate entire obtuse 

 base acute or unequaly repand lobed or jagged 

 near the end, racemes terminal simple corym- 

 bose, pedicels filiform lax — -Carpathian and 

 other European Mts. many short branchlets, 

 leaves small thin uncial, flowers really in a co» 

 rymbose racemes, the lower having long slen* 

 der pedicels, petals white rounded. My des- 

 cription is original from a specimen of Jacquin, 

 introduced here to compare it with the blended 

 kinds. 



655. Spirea (Ch.) versifolia Raf. chame- 

 drif. Pallas ft. t. 15. Sm. Hooker fl. bor. &c. 

 Smooth, branches terete redish, leaves petio- 

 late acute at both ends ovate serrate, base en- 

 tire, the lower duplicate serrate ovate lanceol, 

 flowers subumbellate — Sibiria and New Sibiria, 

 flowers white, almost in umbels since pedicels 

 fasciculate, thus distinct from the last, and 

 leaves quite unlike ; but Pallas says the leaves 

 are variable, probably many species are even 

 bkndcd here, one of which 1 can ascertain. 



