Vegetation Science Group

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

Vegetation of the Czech Republic

Alliance XBA
Caucalidion von Rochow 1951

The alliance Caucalidion includes vegetation of thermophilous annual weeds growing in cereal fields or vineyards on base-rich soils at low altitudes. Its distribution range includes central and southern Europe. Caucalidion communities are often rich in species and contain several endangered species, mostly archaeophytes of Mediterranean or Near East origin. In the past it contained some weed species which were sown with the crop every year, but with the advent of modern seed-cleaning technologies these species rapidly declined. Species composition of Caucalidion vegetation changes remarkably during the season, and therefore separate associations are recognized for spring and summer communities on the same sites.

Orig. (von Rochow 1951): Caucalion-Verband (Caucalis daucoides = C. platycarpos. C. latifolia = Turgenia latifolia)

Syn.: Caucalidion lappulae Tüxen 1950 (§ 2b, nomen nudum), Veronico politae-Taraxacion Kropáč et Hadač in Kropáč et al. 1971, Sherardion Kropáč et Hejný ex Kropáč 1978 p. p.

Diagnostic species: Adonis aestivalis. Aethusa cynapium s. l. (predominantly A. cynapium s. str.), Anagallis arvensis. Atriplex patula. Avena fatua. Capsella bursa-pastoris. Chenopodium album agg., Cirsium arvense. Conringia orientalis, Consolida regalis, Convolvulus arvensis. Descurainia sophia, Euphorbia exigua, E. helioscopia. Fallopia convolvulus. Galium spurium. Geranium pusillum, Lamium amplexicaule, L. purpureum. Lathyrus tuberosus. Neslia paniculata, Papaver rhoeas, Polygonum aviculare agg. (predominantly P. aviculare s. str.), Sherardia arvensis, Silene noctiflora, Sinapis arvensis. Sonchus arvensis. S. asper. Stellaria media agg. (predominantly S. media s. str.), Thlaspi arvense. Tripleurospermum inodorum. Veronica hederifolia agg., V. persica. V. polita. Viola arvensis

Constant species: Anagallis arvensis. Capsella bursa-pastoris. Chenopodium album agg., Cirsium arvense. Consolida regalis. Convolvulus arvensis. Elytrigia repens. Fallopia convolvulus. Galium aparine. Lamium amplexicaule. Papaver rhoeas. Polygonum aviculare agg. (predominantly P. aviculare s. str.), Silene noctiflora. Sinapis arvensis. Stellaria media agg. (predominantly S. media s. str.), Taraxacum sect. Ruderalia. Thlaspi arvense. Tripleurospermum inodorum. Veronica hederifolia agg., Veronica persica. V. polita. Viola arvensis

Source: Lososová Z. (2009): XBA Caucalidion von Rochow 1951. 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. 80-82.