Thesium References Thesium plant genus Ask Anything Homework Help Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: bastard toadflax…for plants of the genus Thesium, particularly Thesium humifusum, which is also parasitic. The bisexual yellow or yellowish green flowers are grouped in terminal clusters, and the one-seeded fruit is dry and green. Read More…for plants of the genus Thesium, particularly Thesium humifusum, which is also parasitic. The bisexual yellow or yellowish green flowers are grouped in terminal clusters, and the one-seeded fruit is dry and green. Read More