Buffalobur (Solanum rostratum)
Other common names
Kansas thistle, Texas thistle, Colorado bur
Annual, flowers midsummer to September. Grows up to two feet high. The stems, leaves, and even flowers sport many sharp spines. Leaves are deeply lobed and grow up to five inches long. Yellow flowers are one inch across with five petals. A dry berry covered with sharp spines contains numerous black, wrinkled and flattened seeds.
Buffalobur is a native of the Great Plains and is drought tolerant. It can be found in meadows, dry rangeland, pastures, lawns, cultivated fields, roadsides and waste areas. It is not very competitive and survives in disturbed, dry areas. It can grow in a wide variety of environmental conditions and serves as a host for the Colorado potato beetle. The burs may cause damage and considerable loss in wool and fiber value for sheep and goats.