|Colorado bursage, linear-leaf bursage, plains ragweed, ragweed, streaked ragweed|
The following Participating Institutions are custodians for this species in the CPC National Collection:
CPC National Office
The conservation of Ambrosia linearis is fully sponsored.
Jim Locklear contributed to this Plant Profile.
It may be surprising to find a rare plant in a genus known for its weeds, but such is the case of the Colorado bursage. Known only from the high plains of eastern Colorado, this ragweed relative is associated with unique, temporary rainwater basins known as playa lakes, as well as other seasonally-moist habitats. The cycle of filling and drying in such places creates a natural disturbance of the shortgrass prairie vegetation, and provides a specialized niche for the Colorado bursage. Elevation 4300-6700 ft.
Distribution & Occurrence
Seasonally moist habitats including playa lakes, intermittent streams, small prairie depressions, and county road edges and ditches within shortgrass prairie. Occurs at the upper margins of playa basins and on terraces just above stream beds. Plants growing in these natural settings tend to be scattered, while those growing at roadsides often occur in very dense stands.
|Probably 50-75 "populations," but many of these are roadside occurrences that occupy ditches. Actual number of populations in high quality natural habitat such as playas and stream terraces is much less, perhaps less than 10 (Locklear 1989).|
Conservation, Ecology & Research
Plowing and planting habitat to crops.
Excessive livestock concentration leading to trampling.
Location and protection of high quality natural occurrences.
McGregor, R.L. 1986. Flora of the Great Plains. Lawrence: Univ. Press Kansas. 1392 ppp.