Four subspecies are recognized for Diuca diuca (Paynter 1970, Jaramillo 2011, Clements et al. 2014, Dickinson and Christidis 2014):
crassirostris, described as Diuca diuca crassirostris Hellmayr 1932; type locality Ramadilla, Capiapó Valley, Atacama, Chile (Paynter 1970).
Subspecies crassirostris occurs in northern Chile (Antofagasta south to Coquimbo), southern Bolivia (southeastern Potosí, western Chuquisaca, and western Tarija), and northwestern Argentina (Jujuy and Salta south to La Rioja) n southeast and northern Argentina (Bullock 1940, Jaramillo 2011, Herzog et al. 2016). This is the largest of the subspecies, with a larger and thicker bill. The outer web of the outermost tail feather is totally white (Jaramillo 2011).
diuca, described as Fringilla diuca (Molina 1782); type locality "Chile".
The nominate subspecies occurs in central Chile from Coquimbo south to Aysén, and in central Argentina from Mendoza to Santa Cruz. See Detailed Description.
minor, described as Diuca minor Bonaparte 1850; type locality Patagonia, restricted to Río Negro by Hellmayr (1938: 339).
Subspecies minor breeds in Argentina from Córdoba south to Santa Cruz, and in southern Chile in northern Magallanes (Bullock 1940). It is at least partially migratory, dispersing in the nonbreeding season north and east to northern Argentina in Tucumán, Santiago del Estero, and Entre Rios, to Uruguay (Paysandu) in Uruguay, and to southern Brazil (western Rio Grande do Sul) (Belton 1985, Ridgely and Tudor 1989).
This is the smallest of the subspecies. It has a brownish tinge on the back, resembling a female or a juvenile (Jaramillo 2011).
chiloensis, described as Diuca diuca chiloensis Philippi and Peña 1964; type locality eastern central coast of Isla Grande de Chiloé, Chile (Paynter 1970).
Subspecies chiloensis is only known from the type locality. This subspecies is smaller than nominate diuca, and has more saturated coloration (Jaramillo 2011).