This is a specimen of the bamboo species Arthrostylidium venezuelae. A. venezuelae is one of over 400 species of bamboo that are native to Central and South America. Most American bamboos have small stems and use surrounding vegetation to help them stand upright. This specimen is from Costa Rica and it served as one of the sources of DNA used in a 2012 research paper on the evolution of woody bamboos of the New World tropics. American bamboo diversity and evolution is one of the many research areas that MPM curators have investigated over the years.