Question: In between Iresine and Echinacea which genus contains 20 to 25 species?

Context paragraphs:
Hyalopeziza: Hyalopeziza is a genus of fungi within the Hyaloscyphaceae family.  The genus contains 20 species.

Lichenothelia: Lichenothelia is a genus of fungi in the family Lichenotheliaceae.  The widespread genus contains 20 species.

Iresine: Iresine is a genus of flowering plants in the amaranth family, Amaranthaceae.  It contains 20 to 25 species, all of which are native to the American tropics.  The generic name is derived from the Greek word εριος ("erios"), meaning "wooly", referring to the trichome-covered flowers.  Bloodleaf is a common name for those species that have colored foliage, and these are often cultivated as ornamental plants.  Some species are additives to versions of the hallucinogenic drink Ayahuasca.

Melanogaster (fungus): Melanogaster is a genus of fungus that resemble truffles, and are often mistaken for them.  However, they do not have the characteristic aroma and value of truffles, although some have been used culinarily.  None are known to be poisonous.  The genus contains 25 species that collectively have a widespread distribution.

Corsia: Corsia is a little-studied plant genus from the monocotyledon family Corsiaceae.  It was first described in 1877 by Italian naturalist Odoardo Beccari and contains 25 species, all of which lack chlorophyll and parasitize fungi for nutrition.  All 25 species are distributed through New Guinea, the Bismarck Archipelago, the Solomon Islands and Queensland, Australia.

Zeltnera: Zeltnera is a genus of flowering plants in the gentian family.  It was erected in 2004 when the genus "Centaurium" (the centauries) was split.  Genetic analysis revealed that "Centaurium" was polyphyletic, made up of plants that could be grouped into four clades. Each became a genus.  "Centaurium" remained, but it is now limited to the Eurasian species.  The Mexican species now belong to genus "Gyrandra", and the Mediterranean and Australian plants are in genus "Schenkia".  The new name "Zeltnera" was given to this genus, which contains most of the North American centauries.  There are about 25 species.

Echinacea: Echinacea is a genus, or group of herbaceous flowering plants in the daisy family.  The "Echinacea" genus has nine species, which are commonly called purple coneflowers.  They are found only in eastern and central North America, where they are found growing in moist to dry prairies and open wooded areas.  They have large, showy heads of composite flowers, blooming from early to late summer.  The generic name is derived from the Greek word ἐχῖνος ("ekhinos"), meaning "hedgehog," due to the spiny central disk.  These flowering plants and their parts have different uses.  Some species are cultivated in gardens for their showy flowers.  "Echinacea purpurea" is used in folk medicine.  Two of the species, "E. tennesseensis" and "E. laevigata", are listed in the United States as endangered species.

Unguiculariopsis: Unguiculariopsis is a genus of fungi in the family Helotiaceae.  The genus contains 20 species.

Cenangium: Cenangium is a genus of fungi in the family Helotiaceae.  The genus contains 25 species.  The type species "Cenangium ferruginosum" causes dieback of pines.

Calyptocephalellidae: The Calyptocephalellidae are a family of toads found in Chile containing two genera, "Calyptocephalella" and "Telmatobufo".  The "Calyptocephalella" genus contains one species, "C. gayi", the helmeted water toad, which is a large aquatic toad weighing up to 0.5 kg .  The "Telmatobufo" genus contains four species, "T. australis", "T. bullocki", "T. ignotus", and "T. venustus".  All species within the family are considered threatened, with "T. bullocki" and "T. venustus" being classified as critically endangered.

Supporting paragraphs: Iresine Echinacea
Answer: Iresine