Note 176 — {41} Fifthly, Of Plants.

Alnus, Tourn. One of the three New-England species (A. incana, Willd.) is common to Europe and America. Another (A. serrulata, Willd.) “bears so great a resemblance,” says F. A. Michaux, to the common European alder (A. glutinosa, Willd.) “in its flowers, its seeds, its leaves, its wood, and its bark, as to render a separate figure unnecessary; the only difference observable between them” being “that the European species is larger, and has smaller leaves.”—Sylva, vol. ii. p. 114. Compare Gray, Statistics, &c., l. c., p. 83. A. viridis, our third species, is common to Europe and this country.