Agathis is a relatively small genus, with only 21 known species.
The final and smallest genus is Trogonoptera with just two species.
If valid, it is a small genus with just about 10 species from southern Africa.
Mexico is a small genus of beetles, containing two species.
A small genus of similar trees, Angophora, has also been known since the 18th century.
It is a small genus with 3 species, which are found in Amazonia.
It is a member of the relatively small genus Hemerocallis.
It is a small genus, with only 8 currently accepted species.
This family contains probably (see below) some 50 species in 1 large and four fairly small genera.
Hornungia is a small genus of plants in the mustard family.