cernua_).
Pond-lily (_Nymphaea odorata_).
Wild Rose (_Rosa nitida_).
Twin-flower (_Linnaea borealis_).
Sugar maple (_Acer saccharinum_).
Linden (_Tilia Americana_).
Locust-tree (_Robinia pseudacacia_).
White-alder (_Clethra alnifolia_).
Smooth azalea (_Rhododendron arborescens_).
White azalea (_Rhododendron viscosum_).
Pinxter-flower (_Rhododendron nudiflorum_).
Yellow azalea (_Rhododendron calendulaceum_).
Sweet bay (_Magnolia glauca_).
Mitchella vine (_Mitchella repens_).
Sweet coltsfoot (_Petasites palmata_).
Pasture thistle (_Cnicus pumilus_).
False wintergreen (_Pyrola rotundifolia_).
Spotted wintergreen (_Chimaphila maculata_).
Prince's pine (_Chimaphila umbellata_).
Evening primrose (_Oenothera biennis_).
Hairy loosestrife (_Steironema ciliatum_).
Dogbane (_Apocynum_).
Ground-nut (_Apios tuberosa_).
Adder's-tongue pogonia (_Pogonia ophioglossoides_).
Wild grape (_Vitis cordifolia_).
Horned bladderwort (_Utricularia cornuta_).

The last-named, horned bladderwort, is perhaps the most fragrant
flower we have. In a warm, moist atmosphere, its odor is almost too
strong. It is a plant with a slender, leafless stalk or scape less
than a foot high, with two or more large yellow hood or helmet shaped
flowers. It is not common, and belongs pretty well north, growing in
sandy swamps and along the marshy margins of lakes and ponds. Its
perfume is sweet and spicy in an eminent degree. I have placed in the
above list several flowers that are intermittently fragrant, like the
hepatica, or liver-leaf. This flower is the earliest, as it is
certainly one of the most beautiful, to be found in our woods,
and occasionally it is fragrant. Group after group may be
inspected--ranging through all shades of purple and blue, with some
perfectly white--and no odor be detected, when presently you will
happen upon a little brood of them that have a most delicate and
delicious fragrance. The same is true of a species of loosestrife
growing along streams and on other wet places, with tall bushy stalks,
dark green leaves, and pale axillary yellow flowers (probably
European). A handful of these flowers will sometimes exhale a sweet
fragrance; at other times, or from another locality, they are
scentless. Our evening primrose is thought to be uniformly
sweet-scented, but the past season I examined many specimens, and
failed to find one th