This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Scape 6'-2o' high, 6-20-flowered, several-bracted. Leaf-blades orbicular or oval, spreading, obtuse, coriaceous, shining above, crenulate, narrowed, rounded, truncate or rarely subcordate at the base, 1' - 3' long; flowers white, nodding, very fragrant, 7"-9" broad; pedicels 2"-3" long, mostly longer than their bracts; calyx-lobes oblong or lanceolate, about one-third the length of the obtuse, converging, thick petals; stamens and style de-clined-ascending; style exserted, annular under the stigma; anther-sacs mucronate at base; capsule 2"-3" in diameter.
In dry woods, Nova Scotia to South Dakota, Georgia and Ohio. False, larger, or pear-leaved winter-green. Indian or canker lettuce. Wild or liverwort lettuce. Copper- or dollar-leaf. Consumption-weed. June-July. Included in P. rotundifolia L. in our first edition, which proves to be a distinct Old World species.
P. chlorantha Sw. Act. Holm. 1810: 190. pl. 5. 1810.
Scape 4'-12' high, 3-10-flowered. Blades orbicular, or broadly oval, mostly obtuse at both ends, but sometimes narrowed at the base, coriaceous, dull, obscurely crenulate, or entire, 1/2-1 1/2 long, shorter than or equalling their petioles; flowers nodding, slightly odorous, greenish-white, $"-7" broad; pedicels 2"-3" long, mostly longer than their bracts; calyx-lobes ovate, or triangular-ovate, acute or obtuse, about one-fourth the length of the obtuse converging petals; stamens and style declined-ascending; anther-sacs short-beaked; style exserted; capsule about 3" in diameter.
In dry woods, Labrador to British Columbia, south to the District of Columbia, Illinois, Nebraska and in the Rocky Mountains to Arizona. Also in Europe. Shin-leaf. June-July.
Pyrola elliptica Nutt. Gen. 1: 273. 1818.
Scape 5'-10' high, 7-15-flowered. Leaf-blades broadly oval, or elliptic, thin or membranous, dark green, obtuse, but usually mucronulate at the apex, narrowed or rounded at the base, plicate-crenulate with very low teeth, 1 1/2'-3' long, almost always longer than their petioles; flowers greenish-white, nodding, 6"-8" broad, very fragrant; pedicels longer than or equalling their bracts; calyx-lobes ovate-triangular, acute or acuminate, about one-fourth as long as the obtuse, flat petals; stamens and style declined-ascending; anther-sacs scarcely beaked; style somewhat exserted; capsule about 3" in diameter.
In rich, mostly dry woods, Nova Scotia to British Columbia, south to the District of Columbia, Illinois, Michigan, Iowa, South Dakota and in the Rocky Mountains to New Mexico. Wild lily-of-the-valley. June-Aug.