This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Rose            Thorns that are sharp
Cactus         Spines that are sharp
Makahiya     Thorns that warn their predators/animals not to go near them
Rhubarb       A toxic leaf blade that can cause convulsions, coma, and death
Daphne        A toxic part, berries that can cause death to a child
Titan Arum   A corpse plant, with a bad odor with a smell of decomposing                              mammal
Rafflesia      Largest flower, which may make it look scary, and it also have a                          bad odor
Poinsetta     A sap of the plant can cause eye injury
Vines          Thorns
Citrus genus Thorns