Sentence:  I have more than once sat cross-legged in the <WSD>grass</WSD> through a long summer morning and watched without touching while a poppy bud higher than my head slowly but visibly pushed off its cap , unfolded , and shook out like a banner in the sun its flaming vermilion petals . 
Meaning of the word marked with <WSD> tags:  narrow-leaved green herbage: grown as lawns; used as pasture for grazing animals; cut and dried as hay