[Vipera aspis] var. rufescens De Betta, 1853 (nomen nudum)
[Vipera aspis] var. cineria De Betta, 1853 (nomen nudum)
Vipera aspis var. vulgaris Massalongo, 1853
Vipera aspis var. plumbea Massalongo, 1854
Vipera aspis var. cinera De Betta, 1857
Vipera aspis var. cinerascens De Betta, 1857
Vipera aspis var. rufescens — De Betta, 1857
Vipera aspis var. brunnea De Betta, 1857
Vipera aspis var. fulva De Betta, 1857
Vipera aspis var. rufiventris De Betta, 1857
Vipera aspis var. fusca-plumbeiventris De Betta, 1857
Vipera aspis var. Isabellina De Betta, 1857
Vipera aspis var. redii — Calabresi, 1924
Vipera aspis francisciredi — Kramer, 1971
Vipera aspis heinzdischeki Sochurek, 1979
Vipera (Rhinaspis) aspis francisredi — Obst, 1983
Common names: Central Italian asp.[2]
Vipera aspis francisciredi is a venomous subspecies of the European asp[3] endemic to northern and central Italy and adjacent Croatia, Slovenia, and Switzerland.[4]
^McDiarmid RW, Campbell JA, Touré T. 1999. Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1. Herpetologists' League. 511 pp. ISBN 1-893777-00-6 (series). ISBN 1-893777-01-4 (volume).
^Mehrtens JM. 1987. Living Snakes of the World in Color. New York: Sterling Publishers. 480 pp. ISBN 0-8069-6460-X.
^"Vipera aspis francisciredi". Integrated Taxonomic Information System. Retrieved 15 August 2006.
^Mallow D, Ludwig D, Nilson G. 2003. True Vipers: Natural History and Toxinology of Old World Vipers. Malabar, Florida: Krieger Publishing Company, Malabar. 359 pp. ISBN 0-89464-877-2.
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