Cirsium acaule

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Campanulids
Ordo: Asterales

Familia: Asteraceae
Subfamilia: Carduoideae
Tribus: Cardueae
Subtribus: Carduinae
Genus: Cirsium
Sectio: C. sect. Cirsium
Species: Cirsium acaule
Subspecies: C. a. subsp. acaule – C. a. subsp. gregarium
Name

Cirsium acaule (L.) Scop. (1769)
Synonyms

Basionym
Carduus acaulis L. Sp. Pl. 2: 1199. 1753.

References

Scopoli 1769. Annus Hist.-Nat. 2: 62.
The International Plant Names Index 2009. Published on the Internet. 2010 May 25 [1].

Vernacular names
čeština: pcháč bezlodyžný
Cymraeg: Ysgallen ddigoes
dansk: Lav Tidsel
Deutsch: Stängellose Kratzdistel
English: dwarf thistle, stemless thistle
español: cardo de borreguil, cardo negro, mancaperros
suomi: Keto-ohdake ja kääpiöohdake
français: Cirse acaule
italiano: Cardo nano
lietuvių: Bestiebė usnis
norsk bokmål: Dvergtistel
Nederlands: Aarddistel
polski: Ostrożeń krótkołodygowy
slovenčina: pichliač bezbyľový
svenska: Jordtistel
українська: осот безстеблий

Cirsium acaule or acaulon has the English name dwarf thistle or stemless thistle. It is widespread across much of Europe.[2] It is often found on short, calcerous grasslands.
Description

Cirsium acaule is a perennial herb. The leaves are a spreading rosette, spiny, 10 to 15 cm long.

There is usually only one flower head, although there can sometimes be 2 or 3. Usually it is not stalked from the leaf rosette. The flower head is 3 to 4 cm long, the florets are red/purple. They flower from June to September.[3]
References

The Plant List, Cirsium acaule (L.) A.A.Weber ex Wigg
Altervista Flora Italiana, Cardo nano, Cirsium acaule includes photos and European distribution map
Rose, Francis (1981). The Wild Flower Key. Frederick Warne & Co. pp. 382–383. ISBN 0-7232-2419-6.