Kallstroemia
Kallstroemia is a genus of flowering plants in the caltrop family, Zygophyllaceae. The approximately 20 species it contains are native to tropical and warm temperate regions of the Americas. The flower and fruit morphology is similar to Tribulus. The convex fruits separate into about 10 nutlets each with one seed. The genus is named after A. Kallstroem who lived in the 18th century.
Species
There are 20 species assigned to this genus:- Kallstroemia adscendens
- Kallstroemia boliviana
- Kallstroemia californica Vail - California caltrop
- Kallstroemia curta
- Kallstroemia grandiflora Torr. ex A.Gray - Arizona poppy
- Kallstroemia hageri
- Kallstroemia hintonii
- Kallstroemia hirsutissima Vail ex Small - Hairy caltrop
- Kallstroemia incana
- Kallstroemia maxima Hook. & Arn. - Big caltrop
- Kallstroemia parviflora Norton - Warty caltrop
- Kallstroemia peninsularis
- Kallstroemia pennellii
- Kallstroemia perennans B.L.Turner - Perennial caltrop
- Kallstroemia porteri
- Kallstroemia pubescens Dandy - Caribbean caltrop
- Kallstroemia rosei
- Kallstroemia standleyi
- Kallstroemia tribuloides
- ''Kallstroemia tucumanensis''