 " Trees " is a poem of twelve lines in strict iambic tetrameter . All but one of the lines has the full eight syllables of iambic tetrameter . The eleventh , or penultimate , line begins on the stressed syllable of the iambic foot and drops the unstressed syllable — an acephalous ( or " headless " ) catalectic line — that results in a truncated seven @-@ syllable iambic tetrameter line . Making the meter of a line catalectic can change the feeling of the poem , and is often used to achieve a certain effect as a way of changing tone or announcing a conclusion . The poem 's rhyme scheme is rhyming couplets rendered aa bb cc dd ee aa . 
 " Trees " <a href='drop_aux' title='1'><mark>is</mark></a>a poem of twelve lines in strict iambic tetrameter . All but one of the lines <a href='got' title='2'><mark>has</mark></a> the full eight syllables of iambic tetrameter . The eleventh , or penultimate , line <a href='uninflect' title='3'><mark>begins</mark></a> on the stressed syllable of the iambic foot and <a href='uninflect' title='4'><mark>drops</mark></a> the unstressed syllable — an acephalous ( or " headless " ) catalectic line — <a href='null_relcl' title='5'><mark>that</mark></a><a href='uninflect' title='6'><mark>results</mark></a> in a truncated seven @-@ syllable iambic tetrameter line . Making the meter of a line catalectic can change the feeling of the poem , and is often used to achieve a certain effect as a way of changing tone or announcing a conclusion . The poem <a href='null_genetive' title='7'><mark>'s</mark></a>rhyme scheme is rhyming couplets rendered aa bb cc dd ee aa . 
 Trees  a poem of twelve lines in strict iambic tetrameter . All but one of the lines got da full eight syllables of iambic tetrameter . The eleventh , or penultimate , line begin on the stressed syllable of the iambic foot and drop tdaunstressed syllable — an acephalous ( or " headless " ) catalectic line — result in a truncated seven @-@ syllable iambic tetrameter line . wit the meter of a line catalectic can change thdaeelin of the poem , and is often used to achieve a certain effect as a way of changing tone or announcing a conclusion . The poem  rhyme scheme is rhyming couplets rendered aa bb cc dd ee aa .