Verloove, F.: Bouteloua gracilis (Chloridoideae, Poaceae), a new American xenophyte in Europe. — Willdenowia 34: 67–69. — ISSN 0511-9618; © 2004 BGBM Berlin-Dahlem.
The American grass species Bouteloua gracilis has been found for the first time in Europe as a more or less established alien on rocky talus slopes near Palafolls (NE Spain). The species is described and depicted and its local ecology and origin are discussed.
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