Herewith I send you three pressed withered flowers:  
This one was white, with golden star; this, blue  
As Capri's cave; that, purple and shot through  
With sunset-orange. Where the Duomo towers  
In diamond air, and under pendent bowers  
The Arno glides, this faded violet grew  
On Landor's grave; from Landor's heart it drew  
Its clouded azure in the long spring hours.  
Within the shadow of the Pyramid  
Of Cais Cestius was the daisy found,  
White as the soul of Keats in Paradise.  
The pansy - there were hundreds of them hid  
In the thick grass that folded Shelley's mound,  
Guarding his ashes with most lovely eyes.
Thomas Bailey Aldrich
http://www.poemhunter.com/poem/with-three-flowers-2/