Vegetation Science Group

Department of Botany and Zoology | Faculty of Science | Masaryk University

Vegetation of the Czech Republic

Alliance XCA
Onopordion acanthii Br.-Bl. et al. 1936

The alliance Onopordion acanthii comprises thermophilous to moderately thermophilous anthropogenic vegetation with a predominance of biennial and perennial plants. Soils are usually dry and developed on loess or hard base-rich bedrock types, but also on anthropogenic substrates such as building rubble in villages, around castle ruins and in waste places. In the course of secondary succession in anthropogenic habitats this vegetation usually develops out of stands of the Atriplicion. Sisymbrion officinalis and Malvion neglectae. Onopordion acanthii is an ancient type of ruderal vegetation, which has probably been common since the Neolithic. It contains many archaeophytes, of which several are endangered species of the Czech flora; there are few neophytes.

Orig. (Braun-Blanquet et al. 1936): Onopordion .acanthii) Br.-Bl. 1926

Syn.: Onopordion Br.-Bl. et al. 1926 (§ 2b, nomen nudum), Hordeo-Onopordion Libbert 1932 (§ 35)

Diagnostic species: Artemisia absinthium, A. vulgaris. Ballota nigra. Berteroa incana. Bromus sterilis. B. tectorum, Carduus acanthoides, Descurainia sophia. Echium vulgare. Marrubium peregrinum. Melilotus officinalis, Onopordum acanthium, Reseda lutea

Constant species: Achillea millefolium agg. (predominantly A. collina), Artemisia absinthium. A. vulgaris. Ballota nigra. Carduus acanthoides. Elytrigia repens. Onopordum acanthium

Source: Láníková D. (2009): XCA Onopordion acanthii Br.-Bl. et al. 1936. In: Chytrý M. (ed.), Vegetace České republiky. 2. Ruderální, plevelová, skalní a su»ová vegetace [Vegetation of the Czech Republic 2. Ruderal, weed, rock and scree vegetation]. Academia, Praha, pp. 209-211.