Ben Huberman at the WordPress Daily Post says,
What’s better than a perfect bite? Two perfect bites.
If haiku is the sashimi of poetry, tanka is its heartier hand roll cousin.
Traditional tanka contain five lines instead of haiku’s three, and 31 syllables instead of 17. The structure is that of a haiku followed by two additional lines of seven syllables each: 5-7-5-7-7. (Many contemporary poets take liberties with the specifics, and you can, too.)
So as I post a haiku or a tanka (if I’m not too lazy) every Thursday, I thought I’d have a try at a whole weeks worth for the Weekly Writing Challenge.
I plan to use a season of flowers as my theme, one for each month from March to September.

White magnolia
chic supermodel of spring
delicate petals
such effortless elegance
gracing gardens of England
http://dailypost.wordpress.com/dp_writing_challenge/full-tanka/