The Spaikk bush is an indigenous plant native to Bryyo, and can be found in locations such as Bryyo Thorn Jungle. It produces a venom within its leaves, most likely in order to protect itself from herbivorous species. This venom will not hurt Samus, however. If she stands in it or shoots it, it will shake slightly. It rather resembles a thistle, and contains a bulb in the middle.
"The Spaikk bush is an indigenous strain of plant life that produces venom within its leaves."