Brassicaceae relationships within the Brassicaceae have not always been well resolved yet. It has long been clear that the Aethionemae are sister of the remainder of the family. One analysis from 2014 represented the relation between 39 tribes with the following tree. The name "Brassicaceae" comes to international scientific vocabulary from New Latin, from "Brassica", the type genus, + "-aceae", a standardized suffix for plant family names in modern taxonomy. The genus name comes from the Classical Latin word "brassica", referring to cabbage and other cruciferous vegetables. The alternative older name, Cruciferae, meaning "cross-bearing", describes the four petals of mustard flowers,
Petals of Blood is a great reliance placed on such songs, which help tell, through the oral tradition of linking of proverbs and fables, the history of Ilmorog and Kenya before colonial intervention. "Petals of Blood" caused a stronger critical reaction than Ngugi's previous novels. The use of the past and historical memory is far more widespread in the novel due largely to the use of flashbacks, and questions relating to the past "from the central concerns" of the novel. The strong political motif that runs throughout the novel has also been discussed, focusing on the relation of political ideas to the "Petals