Sentence:  In the center of any open space remaining our grandfathers had planted syringa and sweet shrub , snowball , <WSD>rose-of-Sharon</WSD> and balm-of-Gilead . 
Meaning of the word marked with <WSD> tags:  Asiatic shrub or small shrubby tree having showy bell-shaped rose or purple or white flowers and usually three-lobed leaves; widely cultivated in temperate North America and Europe