Tribulus terrestris Family: Zygophyllaceae – Caltrop Family Annual herbs laying flat on the ground; stems 0.4” to 4” (1 to 10 cm) long Leaves: opposite; pinnately compound; has hairs Flowers: 5 yellow petals; 5 sepals; stamens usually 10; petals 0.12” to 0.2” (3 to 5 mm) long Blooms in Arches National Park: August, September, October, November Location seen: entrance road and around Visitor Center buildings Fruits: 2-spined nutlets; spines are horn-like Pollinators: other genera in this family are pollinated by bees Habitat in Arches National Park: disturbed areas and open sites Other: The genus name, “Tribulus”, is Latin for "three-pointed, a caltrop," the shape of which is suggested by the three-pronged fruit, and referring to the caltrop, a military weapon, an iron ball with projecting spikes. The species name, “terrestris”, is Latin for "on land". Put together, the scientific name can translate to “tribulation of the earth” which refers to the fact that it is not native, spreads rapidly, and has very sharp seeds that can puncture feet or tires. This is a non-native plant. |
Last updated: February 4, 2023