Zygophyllaceae

California caltrop

Kallstroemia californica (S.Watson) Vail

Family: Zygophyllaceae
Genus: Kallstroemia

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California caltrop (Kallstroemia californica) — FlowerPhoto: Melanie J. Davis, CC BY 4.0, from iNaturalist

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Common names

By language (1)

English: California caltrop

Synonyms

Kallstroemia brachystylis Vail
Kallstroemia californica var. brachystylis (Vail) Kearney & Peebles
Kallstroemia californica var. californica
Tribulus brachystylis (Vail) B.L.Rob.
Tribulus californicus S.Watson

Characteristics

Growth habit: Forb/herb
Lifespan: Annual
In the US and Canada: Lower 48 states: native

Photos

FlowerPhoto: Melanie J. Davis, CC BY 4.0, from iNaturalist
FlowerPhoto: Henrik Kibak, CC BY 4.0, from iNaturalist
FlowerPhoto: Dominic Gentilcore, CC BY 4.0, from iNaturalist
FlowerPhoto: Melanie J. Davis, CC BY 4.0, from iNaturalist
FlowerPhoto: Justin Felder, CC BY-SA 4.0, from iNaturalist
Photo: Abraham Sánchez Romero, CC BY 4.0, from iNaturalist
Photo: Abraham Sánchez Romero, CC BY 4.0, from iNaturalist
Photo: Trevor Van Loon, CC BY 4.0, from iNaturalist
Photo: Wendy McCrady, CC BY 4.0, from iNaturalist
Photo: Francisco Farriols Sarabia, CC BY 4.0, from iNaturalist
Photo: Jose Luis Leon de la Luz, CC BY 4.0, from iNaturalist
Photo: Sula Vanderplank, CC BY 4.0, from iNaturalist

More in Kallstroemia

Sources: classification, synonyms from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0); common names, US characteristics from USDA PLANTS Database (2025-05-29, CC0 1.0). About our plant data.