Paulownia [桐, kiri] is the name of a suit in traditional hanafuda decks. It is generally taken to be the twelfth and final suit, representing the month of December [12月, jūnigatsu] or the number 12.
The cards in this suit all feature large paulownia leaves with purple flowers and capsules. There are three Chaff cards and one Bright. The Bright card features a purple and red Phoenix [鳳凰, hōō] above the paulownia plant, with the area below the plant generally colored yellow.
In a few games, including Tensho, an alternate month ordering is used, with the Paulownia suit representing June or the number 6 instead. On the other hand, in the Korean suit order, Paulownia is considered to represent November or the number 11.
Paulownia with Phoenix [桐に鳳凰, kiri ni hōō], or simply Phoenix, is the Bright card of the Paulownia suit.
The Paulownia suit uniquely has three Chaff cards. One of the three Chaff cards generally has a colored area below the paulownia. Some combination of these three cards usually feature the name of the deck’s manufacturer, that company’s logo, and/or other information about the deck.
One of the Paulownia Chaff cards is usually marked with a different-colored background on the bottom of the card, typically yellow in Japan and red in Korea. In Japan it is also known as yellow Chaff [黄カス, ki-kasu] or (Paulownia’s) different-colored Chaff card [(桐の)色違いのカス札, (kiri no) iro-chigai no kasu-fuda].
In most games it is not distinguished from the other two chaff cards, but some games do make a distinction. For example, in the game of Go-Stop it has the same value as two chaff cards, and in the games of Roppyakken and Sakura it has the same value as a Ribbon card.
The two Paulownia Chaff cards with all-white backgrounds are treated as regular Chaff cards in almost all games.
For examples of traditional art with the same motifs as this suit of hanafuda, see also the following category on Wikimedia Commons: