Dittrichia is a genus of flowering plants in the daisy family.
 Its species were formerly included in the genus Inula.
Inula spiraeifolia is a European species perennial herbaceous plant belonging to the genus "Inula" within the daisy family.
Inula is a large genus of about 90 species of flowering plants in the family Asteraceae, native to Europe, Asia and Africa.
Fouquieria is a genus of 11 species of desert plants, the sole genus in the family Fouquieriaceae.
 The genus includes the ocotillo ("F. splendens") and the boojum tree or cirio ("F. columnaris").
 They have semisucculent stems with thinner spikes projecting from them, with leaves on the bases spikes.
 They are unrelated to cacti and do not look much like them; their stems are proportionately thinner than cactus stems and their leaves are larger.
Inula britannica, the British yellowhead or meadow fleabane, is a Eurasian species of plants in the genus "Inula" within the daisy family.
 It is widespread across much of Europe and Asia, and sparingly naturalized in scattered locations in North America.
Inula salicina (common name Irish fleabane (UK) or willowleaf yellowhead) is a plant species in the genus "Inula" in the family Asteraceae.
 It is found across Europe and Asia from Portugal to Japan.
 It has been reported growing in the wild in a few scattered locations in North America but it has not become widely established there.

Question: Does the Inula genus or the Fouquieria genus have more species?
Answer: Inula