There are 15 species and five varieties of Acaciella in the neotropics from the Southern United States to Argentina (see literature Rico-Arce).All of them are found in Mexico.
Their main characteristics are bipinnate leaves without any glands, no spines nor prickles, white to yellowish flowers, mostly in round heads with more than 150 stamens. Pollen polyads 8-celled.

Species

Acaciella angustissima var. angustissima
Acaciella angustissima var. filicoides
Acaciella angustissima var. texensis
Acaciella barrancana
Acaciella bicolor
Acaciella chamelensis
Acaciella glauca
Acaciella goldmanii
Acaciella hartwegii
Acaciella igualensis
Acaciella lemonii
Acaciella painteri var. painteri
Acaciella painteri var. houghii
Acaciella rosei
Acaciella sotoi
Acaciella sousae
Acacciella tequilana ver. tequilana
Acaciella tequilana var. crinita
Acacielle tequilana var. pubifoliata
Acaciella villosa