What things in nature start with the letter X?

Xyris begins with "X". It is also known as yellow-eyed grass, producing long stems topped with a scale-covered brown spike. These spikes produce a number of yellow flowers. The xyris is a perennial aquatic plant found with some frequency near swamps, shallow ponds and wet ditches. The can be found throughout central and northern Florida to Mississippi and the Carolinas For what it's worth...Mikey F.