
While not the longest chapter in the book, chapter thirteen is definitely very important as it includes a turning point in the Games. (Including the infamous fire seen in the teaser trailer).

Quote:
“For a while we hold each others gaze. Then, without even rustling a leaf, her little hand slides into the open and points to something above my head.”A quick history of the Katniss plant:
Katniss’s Latin name is Sagittaria means “of the arrow”. This immediately struck me as ironic, given our heroine’s talent with archery. Katniss was a staple for Native Americans, especially in the Northwest. They dug up the root with their toes in marshy areas. Apparently it was also cultivated in Asia. Katniss has about 30 species, and, like Ms. Everdeen, is very adaptable. It can survive in 0 degrees F, a multitude of soils and either acid or alkaline environments, but it does require a lot of sunlight.
I just learned as I was writing this that Katniss has another name as well: Wapato. As it happens, I had heard of Wapato before and even eaten it! So I can tell you first hand that Katniss root tastes a bit like sweet potato, but more mealy and earthy.
(Source: http://www.homeandgardenideas.com/gardening/flowers/annuals/growing-katniss-plant)