Bothriochloa ischaemum

Bothriochloa ischaemum is a species of perennial grass in the family Poaceae, found throughout much of the world. It is commonly known as yellow bluestem. Two varieties are recognized, of which Bothriochloa ischaemum var. ischaemum is native to Europe, Asia, and Africa and naturalized elsewhere, and var. songarica is native to Asia and naturalized elsewhere. Var. songarica is an invasive weed in Texas, where it is known as "King Ranch bluestem"; it has displaced native grasses in large areas of central and south Texas. The species name come from the Ancient Greek ischaemum, a styptic (causing ischemia). This bunchgrass is characterized by tufts and culms that grow 14-48" tall and have an extensive root system. Near the collar are thick leaves (1-10") that are smooth, flat, and yellow-green in color. Leaves are adorned with long, silky hairs. The plant has flowering stems which spread densely underground and flower up to 4 feet long. The stems present brown to purple at the nodes and......read more on Wikipedia.