The Flowers, known sometimes as the Flowers That Be, or simply Upstairs, are the sapient vegetable entities that run the PPC. They are not all flowers — some are trees, at least one was a fungus, and one is a lichen — and may or may not still be their natural sizes. However, they are all highly intelligent and powerful psychics. Most Flowers are roughly man-sized, from six to seven feet tall.
The Flowers are distinguished from their unintelligent cousins by the use of capital letters — a clover is a three-leaved plant with white flowers which grows in fields, while the Clover was the Head of the Department of Finance and a member of the Board of Department Heads. One known exception to this is the potted fern, which eschews capital letters for what may be confidence reasons.
Where a Flower is given a name apart from its species — the Sub Rosa, Captain Dandy, or of course the Sunflower Official — this usually indicates that they are one of the Firstborn - the Flowers born in the first two burst of energy on Origin. The Firstborn have a different mindset and somewhat altered consciousness compared to other Flowers, and took their names partly as a reflection of this, and partly (particularly in the case of the Sunflower Official) to clearly distinguish themselves from their younger kin.
Several non-Firstborn Flowers have been known to take names, such as the Authoritative Elanor and Admiral Pansy. Most of these appear to have Awakened in HQ; there is no indication of any non-Firstborn Awakened on Origin ever taking a name.
Unlike normal flora, the Flowers are able to move around. They are known to have originally accomplished this by walking on their roots, though they may since have found more efficient methods. The Sunflower Official first discovered the trick of selectively engorging his leaves with water, ensuring a constant supply and allowing them to be used as manipulators.
The Flowers are known to enjoy eating some form of blue-green crystals, a description which matches some kinds of Real World plant food. They 'eat' these by having the crystals poured onto soil in which they have rooted; they are also known to drink in the same manner.
The Flowers came into being on Origin, through a complicated series of events involving astronomically unlikely coincidences which the Legal Department would surely not have allowed had they been in existence. They were the founders of the Organisation which became the PPC, and constituted its original agents. With the destruction of Origin in the Cascade, it is believed that the Flowers working for the PPC and League of Mary Sue Factories are the last survivors. This could be incorrect, however.
You're kidding, right?