08 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 dupHcate 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 

 blended here, one of which 1 can ascertain. 



