Cenchrus echinatus L., known by the common name of burr grass, and may also be known as amorous grass, rosette grass, timbetê or timbete is a species of grass native to South and North America. Burr grass is known to be an indicator plant, therefore, it indicates soil complications, which can be: decayed soils, eroded soils and compacted soils. In addition to being an indicator plant, it is also a plant much feared by farmers and ranchers for being an invasive plant in annual crops, and also for causing injuries to workers and animals and making mechanized harvesting difficult, due to its zoochoric form of dispersion.

Morphology
Annual plant with leaves present in large quantities distributed on cylindrical culms, without hairs and with dark knots. Its seeds have a subglobose shape and can measure from 4 to 7 mm in size. Its inflorescence has the formation of racemes with burdocks, in just one spikelet there can be from 5 to 50 spiny involucres. Its color has yellowish-green tones, which may vary to purple.