This section is from the book "Who's Who Among The Wild Flowers", by W. I. Beecroft. Also available from Amazon: A Field Guide to Edible Wild Plants.
Queen-of-the-Meadow: Quaker Lady. Spiraea latifolia.
Rose Family. June - Aug.
A shrubby plant, 2 - 4 feet high, found in rocky pastures, borders of fields. Newfoundland to Georgia, west to Minnesota and Missouri.
Small, flesh pink or whitish, in dense, terminal clusters.
Light green, oval or oblong, rather coarsely toothed. Plant stems red or purplish brown. S. salicifolia differs from the preceding in its white flowers, yellowish brown stems, and finely toothed leaves. Chiefly in low ground.

Meadow-sweet.
 
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