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 on the western slope of the Sierra Nevada. Subsp. "oregana" grows in a small area of southern Oregon and northern California in serpentine soils in the Siskiyou Mountains. These subspecies are also distinguished by appearance: "Dicentra formosa" is widely grown as a garden plant, and several cultivars have been developed. Those marked have gained the Royal Horticultural Society's Award of Garden Merit: There are several hybrid cultivars involving "D. formosa", the eastern American species "D. eximia" and the Japanese species "D. peregrina": The Pacific bleeding-heart ("Dicentra formosa" subsp. "formosa") was first noted by Europeans when the Scottish surgeon and naturalist