OF NORTH AMERICA, 
73 
bly a peculiar species near to my Sp. crenata, 
as it cannot be Sp. italica ! It must be better 
described, and may be called Sp. hookeriana 
R. It is akin to Sp. japonica. I hope to have 
thus ascertained many obscure or lost species, 
and elucidated the whole genus ; in ordfer to 
remove the difficulties I have been compelled 
to introduce some species not strictly Ameri- 
can, but have greatly increased ours also. This 
will conclude the true G. Spirea, I shall now 
describe the akin blended Genera. 
^ 667. PHYSOCARPA Raf. subg. of Ser. 
(or Physotheca.) Diff. Spirea, calix deeply 5fid, 
pistils 3 united at base, capsules 3 coalescent 
swelled smooth, apex free bivalve, leaves lobed , 
flowers in short corymbose racemes bractea - 
led — Thus it differs as much as Gillenia but 
has not a tubular calix. 
668. Physoc. riparia Raf. Spirea opulifo- 
lia L.*J*c. Yar. tomenteila Dec. Beck. Branch- 
es angular pale, leaves petiolate ovate rounded 
er oblong unequaly serrate often lobed or trifid 
acute quite smooth, beneath pale innervate, 
corymbs terminal, bracts oblong or laciniate, 
pedicles filiform pubescent, calix tomentose 
icute, capsules smooth much swelled — From 
Canada to Carolina, Louisiana and Missouri, 
m the banks of streams. Shrub 5 to 16 feet 
high, leaves 2 or 3 inches long, dowers white 
svith pink shades, capsules fulvous or fuscate, 
seeds rounded yellowish. This has always been 
leemed the Sp. opulifolia by our botanists, and 
it was really that of Linneus, since he gives A- 
nerica as its only locality ; but now many 
ethers must be separated. Yar. 1 . parvifolia y 
2. arborea. 
669. Physoc. opulifolia or glabra Raf. Sp. 
16 
