This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol1", 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 small plant with a short rootstock and thick root-fibers. Stem scapose, naked, with a single obovate leaf at the base; flowers greenish yellow. Upper sepal round-ovate, erect, surrounding the broad column; lateral sepals reflexed, spreading; petals lanceolate, smaller; lip entire, linear-lanceolate, deflexed; spur slightly curved, shorter than the ovary. Beak of stigma not appendaged. Anther-sacs widely diverging, wholly adnate, arcuate; glands small, their faces turned inward. Pod obovoid. [Name diminutive of Lysias.] • A monotypic genus of North America and northern Norway.
Scape slender, naked, 4'-10' high, 4-angled. Leaf solitary, basal obovate, 2.'-5' long, 5"-12" wide; spike 1'-2 1/2' long, loose flowers greenish yellow, about 3" long; upper sepal erect, round-ovate, green with whitish margins; lateral sepals spreading, oblong, obtuse; petals shorter, dilated or obtusely 2-lobed at the base, connate with the base of the column; lip entire, lanceolate, obtuse, deflexed, about 3" long; spur about as long as the lip, slender, nearly straight, blunt; anther-sacs widely divergent below, glands small, rather thick.
In bogs, New Brunswick to British Columbia, Maine, New York and Colorado. Arctic Norway. Dwarf or one-leaved orchis. July-Sept.