Arctium tomentosum explained

Arctium tomentosum, commonly known as the woolly burdock or downy burdock, is a species of burdock belonging to the family Asteraceae.^[1] The species was described by Philip Miller in 1768.

Distribution

This species is native to Eurasia from Spain^[2] to Xinjiang Province in western China.^[3] It is also naturalized in other parts of the world such as North America.^[4]

Description

Arctium tomentosum is a biennial herbaceous plant. The stem is erect, with ascending branches. It can reach a height of about . Leaves are grayish white and quite felted, green and glabrous toward the stem. Basal leaves are petiolate. Leaf blade is heart-shaped, with rather denticulater margins. They can reach a length of 20- and a width of 10-. Flowers are purplish red, with a diameter of 0.9-. This species can be distinguished from related ones because the underside of the leaves is covered with white woolly hairs. Flowers and fruits appear from July to September.^{[3] [5]}

Sources

• Kell DJ. 2006. Arctium Linnaeus, Sp. Pl. 2: 816. 1753; Gen. Pl. ed. 5, 357. 1754. In Flora of North America Editorial Committee (Eds.) Flora of North America North of Mexico, Vol. 21: Asteraceae. New York and Oxford.
• Lopez-Vinyallonga S, Romaschenko K, Susanna A and Garcia-Jacas N. 2011. Systematics of the Arctioid group: Disentangling Arctium and Cousinia (Cardueae, Carduinae). Taxon 60(2): 539–554.
• Pignatti S. - Flora d'Italia (3 voll.) - Edagricole - 1982
• Tutin, T.G. et al. - Flora Europaea, second edition - 1993
• Zangheri P. - Flora Italica (2 voll.) - Cedam - 1976

External links

• • • Catalogue of Life
• Tela botanica

Notes and References

1. http://ww2.bgbm.org/EuroPlusMed/PTaxonDetail.asp?NameCache=Arctium%20tomentosum&PTRefFk=7000000 - Euro+Med PlantBase - The information resource for Euro-Mediterranean plant diversity.
2. http://luirig.altervista.org/flora/taxa/index1.php?scientific-name=arctium+tomentosum Altervista Flora Italiana, Bardana lanuta, Arctium tomentosum Mill.
3. http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200023154 Flora of China Vol. 20-21 Page 153 毛头牛蒡 mao tou niu bang Arctium tomentosum Miller
4. http://bonap.net/MapGallery/County/Arctium%20lappa.png Biota of North America Program 2014 county distribution map
5. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=200023154 Flora of North America Vol. 19, 20 and 21 Page 169 Woolly burdock, bardane tomenteuse, Arctium tomentosum Miller