m 
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 mexziesi 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 
Mended here, one of which 1 can ascertain. 
