Alias: Goathead, Mexican sandbur, Texas sandbur,
ground bur-nut, land caltrop
- Stems: Slender and hairy, 6 to 30 inches long, branching
from base, prostrate or somewhat ascending. Forms mats up to 4
- Leaves: Opposite, hairy, divided into four to eight pairs
of 1/2-inch leaflets, which are asymmetrical at the base.
- Flowers: Five-petalled, yellow, 1/2-inch wide, short-stalked,
borne in the leaf axils. Flowering period is from May to September.
- Seeds: Five separate sections that split at maturity;
each with two long woody spines separated by a narrow line of
short projections; each segment 2 to 4-seeded. Burs are sharply
pointed and can puncture bike and light truck tires.
Puncturevine is an annual that spreads by seeds. It has a simple
taproot with many fine rootlets to take advantage of low moisture
areas, and survive droughts. It generally prefers dry, sandy, or
gravely sites, and is common along roads and highways in Oregon.
Control methods depend on the nature of the infestation. Call your
local weed board for the latest information.
Report all sightings to your local