What is one of the distinguishing features of Little bluestem?

Little bluestem is known for its unique color in the fall, which sets it apart from many other grass species. During this season, the grass transitions to vibrant hues of reddish-brown or purplish tones. This striking change in coloration can make it quite visually distinct in the landscape, especially amid the more muted colors of other plants that might not exhibit such vivid fall displays.

This characteristic coloration is linked to the plant's adaptation to its environment, as it is a warm-season grass that thrives in prairie ecosystems and has evolved distinctive traits to ensure its survival and reproduction. The foliage changes color in response to seasonal temperature fluctuations and its growth cycle, contributing to its overall ecological significance.

The other options do represent features that could describe various grasses but do not specifically identify the distinctiveness of Little bluestem in the same memorable way as its fall color does. Thus, recognizing its unique fall coloration is pivotal in identifying this plant in the wild and appreciating its beauty throughout seasonal changes.