Carduus pycnocephalus

Familia: Asteraceae
Subfamilia: Carduoideae
Tribus: Cardueae
Subtribus: Carduinae
Genus: Carduus
Species:
Subspecies: C. p. subsp. albidus – C. p. subsp. cinereus – C. p. subsp. intermedius – C. p. subsp. marmoratus – C. p. subsp. pycnocephalus

Carduus pycnocephalus L., Sp. Pl. ed. 2, 2: 1151 (1763).

• Carduus pycnocephalus Spreng. = Carduus cephalanthus Viv.

• Linnaeus, C. 1763. Species Plantarum, ed. 2, Tomus II: 1151. Reference page. 

• Hassler, M. 2018. Carduus pycnocephalus. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2018. Species 2000 & ITIS Catalogue of Life. Published online. Accessed: 2018 Apr. 19. Reference page. 
• International Plant Names Index. 2018. Carduus pycnocephalus. Published online. Accessed: Apr. 19 2018. Reference page.
• The Plant List 2013. Carduus pycnocephalus in The Plant List Version 1.1. Published online. Accessed: 2018 Apr. 19.
• Tropicos.org 2018. Carduus pycnocephalus. Missouri Botanical Garden. Published online. Accessed: 19 Apr. 2018. Reference page.
• USDA, ARS, Germplasm Resources Information Network. Carduus pycnocephalus in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 07-Oct-06.

For more multimedia, look at Carduus pycnocephalus on Wikimedia Commons.