Bothrops neuwiedi subtriangular, or headphone-shaped and oppose each other middorsally. The belly is white or yellow with gray speckling. Juveniles have a white tail tip. This species is found in South America east of the Andes and south of approx. 5°S, including Brazil (southern Maranhão, Piauí, Ceará, Bahia, Goiás, Mato Grosso, an isolated population in Amazonas, Rondônia and all southern states), Bolivia, Paraguay, Argentina (Catamarca, Córdoba, Corrientes, Chaco, Entre Ríos, Formosa, Jujuy, La Pampa, La Rioja, Mendoza, Misiones, Salta, San Juan, San Luis, Santa Fe, Santiago del Estero and Tucumán) and Uruguay. According to Vanzolini (1981), the type locality given is ""provincia
Dicentra formosa has narrower flowers and longer, more curved outer petal tips. "D. formosa" is related to "Lamprocapnos spectabilis", another popular plant called "bleeding heart", which was formerly placed in the same genus. The Pacific bleeding-heart is native to moist woodland, forest, and streambanks from California to British Columbia, from sea level to the subalpine zone. There are two subspecies, "Dicentra formosa" subsp. "formosa" and "Dicentra formosa" subsp. "oregona". Subsp. "formosa" grows in the majority of the plant's range, from Vancouver Island and southern British Columbia and south through Washington and Oregon to central California in the Coast Ranges and Cascades, and