This section is from the book "Sub-Alpine Plants Or Flowers Of The Swiss Woods And Meadows", by H. Stuart Thompson. Also available from Amazon: Sub-Alpine Plants: Or, Flowers of the Swiss Woods and Meadows.
Differs from the next chiefly in the style, which is considerably longer, and from the last in never being so curved. The flowers are variable in size.
Woods and moist, shady places; not very common. June, July.
Europe, ascending the mountains in the south and in the Caucasus; Armenia, Northern Asia, extreme north of N. America. British.
Leaves on long stalks as in the 2 last, broadly ovate, rather thick, entire or slightly crenate. Flowers drooping in a short, loose raceme. Sepals short and broad, rather triangular. Petals con-nivant, ovate or orbicular, quite free, closing over the stamens, often pinkish. Style usually shorter than corolla, nearly straight, with a broad, 5-lobed, spreading stigma.
Woods and shady places. June, July.
Europe, Northern and Western Asia, and extreme north of N. America. British.
Somewhat like P. rotundifolia, but with the long style more curved and reflexed. Root-leaves orbicular, rounded at the top, and sometimes almost truncate at the base, though variable, slightly toothed, longly petioled. Inflorescence loose, 5-7 flowered. Flowers greenish white. Sepals ovate, acuminate, very short.
Mountain woods up to 6000 feet; rather rare. June, July.
Alps, Jura, Cevennes, Pyrenees, Corsica, Central and Northern Europe, Asia Minor, N. America.
Raceme unilateral. Style long and nearly straight. Leaves ovate, acute, distinctly toothed and prominently veined. Flowers small, greenish white. Easily distinguished from all the other species by the leaves and flowers.
Mountain woods of the sub-alpine region; common. June, July.
Alps, Jura, Pyrenees, Corbieres, Cevennes; Europe, Western and Arctic Asia, N, America, British.