Erect, shrubby and perennial at least below, the tops usually dying back, 1 to 3 feet tall, usually simple; stems floccose-pubescent. Leaves short petioled, ovate or oval, 1 to 2 inches long, one-half to 1 inch wide, unequally toothed, blunt or pointed at the apex, narrowed or rounded at the base, smooth and dark green above, woolly-pubescent with whitish hairs beneath. Flowers pink or purplish, rarely white, in dense terminal.
Panicles, each flower about one-fifth of an inch broad; divisions or follicles of the fruit pubescent.
In wet meadows, swamps and low ground, Nova Scotia to Manitoba south to Georgia and Kansas. Flowering from July to September.
Memoir 15 N. Y. State Museum
A. hardhack; steeplebush - Spiraea tomentosa
The Corymbed Spiraea (Spiraea corymbosa Rafinesque), with oval, ovate or orbicular leaves, slightly cordate at the base, or rounded, and with small white flowers in dense terminal, often leafy corymbs, is found occasionally on rocky banks and in wood of the southern part of the State.