[Published by Mrs. Shelley, "Posthumous Poems", 1824.
There is a fair draft amongst the Boscombe manuscripts.]
I.
The flower that smiles to-day
To-morrow dies;
All that we wish to stay
Each stanza of this poem is divided into their own separate part so that one may read each one individually and think of them as pieces of a puzzle, especially seeing that they each take on different tones and form. 
 Part I  takes on a blunt tone of disappointment and somewhat acceptance of the cruel realities of life. Though there is a clear ABABCCC rhyme scheme, the unsettling lack of flow due to varying line lengths and meter conveys a feeling of unexpected disappointment in the reader. This rhyme scheme is the  only thing consistent throughout all three stanzas . 
 Though there is no consistent meter in these lines, there are many hidden inner-rhymes and slant rhymes in this poem.
Mutability II The flower that smiles today...