|Scientific Name||Tribulus terrestris||USDA PLANTS Symbol||TRTE|
|Common Name||Puncture Vine, Goathead||ITIS Taxonomic Serial No.||29057|
Life zones and habitat: Plains and foothills (3500 to 7500 ft.); often in sandy soils along roadsides, disturbed areas and cultivated fields.
Plant: Low-growing, prostrate annual; stems with long, silky hairs, branched from the base and forming mats to 3 ft. wide.
Leaves: Opposite, even-pinnate, 3/4 to 2 inches long overall with 3 to 9 pairs of elliptic to oblong or ovate leaflets 1/8 to 1/2-inch long; one of each pair of leaves smaller or missing, lowest pair of leaflets unequal in size; upper leaf surface mostly smooth, lower surface and margins with long silky hairs.
Inflorescence: Solitary, small (~3/8-inch across) flowers arising from axils of smaller or absent leaves; 5 sepals narrowly lanceolate-ovate; 5 yellow petals and 10 stamens with yellow anthers.
Bloom Period: June to September.
Fruit: Hard bur with two larger spines, the bane of bicycle riders.
References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and Colorado Department of Agriculture.
|BONAP Distribution Map
© Tom Lebsack 2022
Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County