Sentence:  Swadesh , and therefore Hoijer , felt compelled to omit all terms denoting species or even genera ( fox , vulture , salmon , yellow pine , manzanita ) ; their classes of animal and plant terms are restricted to generalizations or recurrent parts ( fish , bird , tree , <WSD>grass</WSD> , horn , tail , bark , root ) . 
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