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..
A branching shrub, with deciduous oval or oblong short-petioled alternate leaves. Flow-ef^ttmbellate or short-corymbose, short-pedicelled, rose-colored, purple, or nearly white, from terminal scaly buds. Calyx minute. Corolla 2-lipped, the upper lip unequally 2-3-lobed, the lower divided to the base, the segments recurved. Stamens 10, about equalling the corolla; anthers awnless-, attached by their backs to the filaments, opening by terminal pores. Ovary 5-celled; ovules numerous in the cavities; style slender, slightly exserted; stigma capitate. Capsule linear-oblong, 5-celled, septicidally 5-valved from the summit, many-seeded. [From the Greek, rhodon, a rose.]
Rhodora canadensis L. Sp. Pl. Ed. 2, 561. 1762.
Rhododendron canadense B.S.P. Prel. Cat. N. Y. 33. 1888.
A shrub, l°-3° high, the branches slender, ascending or erect, the twigs sparingly strigose. Leaves oval or oblong, obtuse and mucronulate at the apex, narrowed at the base, entire, dark green and glabrous, or nearly so, above, light green or pale and glaucous and slightly pubescent, at least on the veins beneath, 1-2' long, 3"-7" wide; flowers expanding with or before the leaves; pedicels very short, stiff, hairy; corolla about 1' broad; lower lip divided into two linear-oblong obtuse segments; capsule oblong, puberulent, glaucous, $"-7" high.
In bogs and on wet hillsides, Newfoundland to New Jersey, west to Quebec, central New York and Pennsylvania. Lamb-kill. May.