Photosynthesis is by the C4 pathway. Roots can develop nitrogen-fixing nodules. Flowers axillary, solitary , bright yellow , 5-15 mm in diameter. Stamens and ovary chambers twice the number of petals. Seeds usually 3-5 per nutlet, remain enclosed within burrs.
Burrs often remain on senesced plants or the soil surface.
Disturbed places, roadsides, railways, cultivated fields, yards, waste places, walk ways. Grows best on dry sandy soils, but tolerates most soil types. Intolerant of freezing temperatures. Prevalent in areas with hot summers and dry soils. Nutlets disperse by adhering to tires, shoes and clothing of people, fur, feathers, and feet of animals.