"The Amen! of Nature is always a flower." So said Oliver Wendell Holmes, whose inspired quotation is just one of many that appear in Clinton Smith's charming new book, Veranda: The Romance of Flowers. And the word "romance" in the book's title is appropriate, for Smith's book could be described as a sophisticated and thoroughly researched love-letter to flowers of all kinds. Culled from the Veranda archives, the book's photos showing an array of both flowers and interiors are testament to…