hardhack

[hahrd-hak] /ˈhɑrdˌhæk/
noun
1.
a woolly-leaved North American shrub, Spiraea tomentosa, of the rose family, having short, spikelike clusters of rose-colored flowers.
Origin
1805-15, Americanism; hard + hack1
British Dictionary definitions for hardhack

hardhack

/ˈhɑːdˌhæk/
noun
1.
a woody North American rosaceous plant, Spiraea tomentosa, with downy leaves and tapering clusters of small pink or white flowers Also called steeplebush