New weed problems in Spain
The following plants have been recently introduced in Spanish fields and are considered a threat:
- Leptochloa uninervia (Poaceae) originating from the Americas.
- Leptochloa fascicularis (Poaceae) originating from North-America where it is considered endangered and threatened in some places.
- Heteranthera reniformis (Pontederiaceae) originating from tropical America.
- Heteranthera limosa (Pontederiaceae) originating from tropical America.
- Heteranthera rotundifolia (Pontederiaceae) originating from America.
- Sagittaria montevidensis (Alismataceae) originating from the Americas.
- Amsinckia lycopsoides (Boraginaceae) originating from the eastern part of North America, it occurs in waste places and is naturalized in Britain (Tutin et al. 1964/80).
- Amsinckia calicina (Polemoniaceae) originating from the Americas, found in waste lands and naturalized in France (Tutin et al. 1964/80).).
- Solanum physalifolium (Solanaceae) originating from South America. It has already been reported as an emerging weed for Europe (EPPO RS 2005/174).
- Sycios angulatus (Cucurbitaceae) was presented in EPPO RS 2005/050 and 2006/091. It is one of the most recently introduced weeds, first recorded in Gerona in 1996. In 2004, 5 maize fields were found infested in Lérida.
Pablo del Monte J, Angeles Mendiola M (2005) Malas hierbas: un problema constante, nuevos problemas. Phytoma España. 169, 86-89.
Tutin TG, Heywood VH, Burges NA, Moore DM, Valentine DH, Walters SM and Webb DA (1964/80) Flora Europeaea, Vol 1-5. Cambridge University Press, Cambridge.