The term Pyrolaceae has been replaced almost entirely by Pyroloideae and refers to an entire sub-family of Ericaceae (the heather family). There are a few remaining plants species considered to fall in the Ericaceae sub-family Pyrolaceae; Pyrola rotundifolia (round-leaved wintergreen) and Pyrola Americana (American wintergreen) are synonyms and you will find more information if you search under those names. This plant is common to  woodlands of northern New England and native to woods and bogs all along the eastern United States, from Newfoundland to North Carolina.

P. rotundifolia prefers to grow in the shady, loamy habitat that it favors naturally but will also do well in sandy or mossy soil.  They grow on spreading, underground rhizomes and bloom from June to July with white to creamy red-tinged racemes of flowers.

Courtesy of the NYBG Plant Information Service