The three layers are coloured with jasmine flowers, water caltrop, and mugwort. Guaiacum angustifolium is a species of flowering plant in the caltrop family, Zygophyllaceae. The people at Bashidang cultivated rice, along with water caltrop and "Nelumbo nucifera". The main invasive species is the water caltrop. The Japanese version of the caltrop is called "makibishi". It is a member of the caltrop family, Zygophyllaceae. A water plant with similarly-shaped spiked seeds is called the "water caltrop", "Trapa natans". It is a "declared plant" ("infestations" described under "caltrop") in South Australia. As dragon's teeth are immobile, the analogy with the caltrop is inexact. The insignia of the association is a Caltrop. There are rare and native vegetals, like the water caltrop ("Trapa natans verbanensis"). Larrea is a genus of flowering plants in the caltrop family, Zygophyllaceae. Bulnesia is a genus of flowering plants in the caltrop family, Zygophyllaceae. Endemic species include water caltrop and lady's slipper.