@book {8566,
	title = {Docks and knotweeds of the British Isles (BSBI Handbook n{\textdegree} 3)},
	year = {1981},
	month = {1981///},
	publisher = {BSBI, London},
	organization = {BSBI, London},
	author = {J.E. Lousley and D.H. Kent}
}
@book {8542,
	title = {Grass weeds II},
	year = {1981},
	month = {1981///},
	publisher = {Documenta, Ciba-Geigy, Basle: XX},
	organization = {Documenta, Ciba-Geigy, Basle: XX},
	author = {H. Scholz}
}
@article {8478,
	title = {Schkuhria pinnata v {\v C}eskoslovensku},
	journal = {Zpr. {\v C}s. Bot. Spole{\v c}., Praha},
	volume = {16},
	year = {1981},
	month = {1981///},
	pages = {11 - 13},
	author = {J. Chrtek}
}
@article {8460,
	title = {Bemerkungen {\"u}ber Bromus madritensis und B. rubens (Gramineae)},
	journal = {Willdenowia},
	volume = {11},
	year = {1981},
	month = {1981///},
	pages = {249 - 258},
	author = {H. Scholz}
}
@article {8380,
	title = {Naturalised autumn olive in Illinois},
	journal = {Trans. Illin. Acad. Sci},
	volume = {74},
	year = {1981},
	month = {1981///},
	pages = {83 - 85},
	author = {J. Ebinger and L. Lehnen}
}
@article {8426,
	title = {Senecio x albescens Burbidge \& Colgan at Killiney, Co. Dublin: a seventy-eight years old population},
	journal = {Watsonia},
	volume = {13},
	year = {1981},
	month = {1981///},
	pages = {303 - 311},
	author = {J.P. Murphy}
}
@article {8258,
	title = {Coronilla varia L. (Leguminosae), a new addition to the flora of Arizona},
	journal = {Saguaroland Bull},
	volume = {35},
	year = {1981},
	month = {1981///},
	pages = {28 - 29},
	author = {W. Hodgson and M. Mittleman}
}
@article {8242,
	title = {The taxonomy of the genus Euthamia},
	journal = {Rhodora},
	volume = {83},
	year = {1981},
	month = {1981///},
	pages = {551 - 579},
	author = {D.J. Sieren}
}
@article {8282,
	title = {Taxonomic relationships of Texas specimens of Digitaria ciliaris and Digitaria bicornis (Poaceae)},
	journal = {Sida},
	volume = {9},
	year = {1981},
	month = {1981///},
	pages = {34 - 42},
	author = {R.D. Webster and S.L. Hatch}
}
@article {8058,
	title = {Asclepias syriaca L., im herzynischen Florengebiet},
	journal = {Mitt. Florist. Kart},
	volume = {7},
	year = {1981},
	month = {1981///},
	pages = {127 - 130},
	author = {E. Weinert}
}
@article {8033,
	title = {Bromus diandrus Roth (Poaceae)},
	journal = {Madrono},
	volume = {28},
	year = {1981},
	month = {1981///},
	author = {G.A. Marley and W.L. Wagner}
}
@article {7971,
	title = {The genus Amaranthus in Southern Africa},
	journal = {J. S. African Bot},
	volume = {47},
	year = {1981},
	month = {1981///},
	pages = {451 - 492},
	author = {J.P.M. Brenan}
}
@article {8117,
	title = {Atriplex hastata- und Bidens radiata-Gesellschaft im therophytischen Vegetationskomplex am M{\"o}hnesee},
	journal = {Natur und Heimat},
	volume = {41},
	year = {1981},
	month = {1981///},
	pages = {3 - 12},
	author = {H. Diekjobst}
}
@article {8010,
	title = {De Virginische kruidkers},
	journal = {Lepidium virginicum L., in Limburg. Natuurhist. Maandblad},
	volume = {70},
	year = {1981},
	month = {1981///},
	pages = {101 - 105},
	author = {R.W.J.M. Van der Ham}
}
@article {7832,
	title = {What it the Scottish thistle},
	journal = {Glasgow Nat},
	volume = {20},
	year = {1981},
	month = {1981///},
	pages = {101 - 121},
	author = {J.H. Dickson and A. Walker}
}
@article {7626,
	title = {Taxonomy of the genus Glycine, domestication and uses of soybeans},
	journal = {Economic Botany},
	volume = {35},
	year = {1981},
	month = {1981///},
	pages = {272 - 288},
	author = {T. Hymowitz and C.A. Newell}
}
@article {7662,
	title = {Rozmieszczenie Artemisia scoparia W. K. w Polsce. Bad},
	journal = {Fizjogr. nad Polsk_ Zach},
	volume = {32},
	year = {1981},
	month = {1981///},
	pages = {115 - 121},
	author = {W. _ukowski}
}
@article {7461,
	title = {Coreopsis lanceolata L. (Asteraceae - Heliantheae), nueva especie adventicia para la flora Argentina},
	journal = {Darwiniana},
	volume = {23},
	year = {1981},
	month = {1981///},
	pages = {317 - 319},
	author = {A.A. Saenz}
}
@article {7467,
	title = {El g{\'e}nero Panicum (Gramineae) en la Republica Argentina, 2},
	journal = {Darwiniana},
	volume = {23},
	year = {1981},
	month = {1981///},
	pages = {233 - 256},
	author = {F.O. Zuloaga}
}
@article {7619,
	title = {Population ecology of Melilogus alba in a limestone quarry. J},
	journal = {Ecol},
	volume = {69},
	year = {1981},
	month = {1981///},
	pages = {33 - 44},
	author = {K.M. Klemow and D.J. Raynall}
}
@article {7578,
	title = {Un mode curieux d{\textquoteright}introduction de phan{\'e}rogames adventices par les fumures},
	journal = {Dumortiera},
	volume = {19-20},
	year = {1981},
	month = {1981///},
	pages = {26 - 28},
	author = {Sotiaux, A. and Roegiers and Zuttere, De}
}
@article {7472,
	title = {The foxglove trees},
	journal = {Davidsonia},
	volume = {12},
	year = {1981},
	month = {1981///},
	pages = {57 - 61},
	author = {A.P. Wharton}
}
@article {7270,
	title = {Aliens and adventives. Adventive news 21. Notes on some alien pepperworts},
	journal = {BSBI News},
	volume = {29},
	year = {1981},
	month = {1981///},
	pages = {8 - 13},
	author = {E.J. Clement}
}
@article {7271,
	title = {Three Panicums},
	journal = {BSBI News},
	volume = {27},
	year = {1981},
	month = {1981///},
	author = {E.J. Clement}
}
@article {7272,
	title = {Aliens and adventives. Adventive news 18. Petasites albus},
	journal = {BSBI News},
	volume = {26},
	year = {1981},
	month = {1981///},
	author = {E.J. Clement}
}
@article {7273,
	title = {Adventive news 21. Mixed bag},
	journal = {BSBI News},
	volume = {29},
	year = {1981},
	month = {1981///},
	pages = {10 - 13},
	author = {E.J. Clement}
}
@article {7274,
	title = {Bulbous canarygrass in Britain},
	journal = {BSBI News},
	volume = {27},
	year = {1981},
	month = {1981///},
	author = {E.J. Clement}
}
@article {7275,
	title = {Confusion between white and Japanese millets},
	journal = {BSBI News},
	volume = {27},
	year = {1981},
	month = {1981///},
	pages = {16 - 18},
	author = {E.J. Clement}
}
@article {7276,
	title = {Sweet bromegrass in Britain},
	journal = {BSBI News},
	volume = {28},
	year = {1981},
	month = {1981///},
	pages = {12 - 14},
	author = {E.J. Clement}
}
@article {7277,
	title = {Rough bentgrass in Britain},
	journal = {BSBI News},
	volume = {27},
	year = {1981},
	month = {1981///},
	pages = {18 - 20},
	author = {E.J. Clement}
}
@article {7206,
	title = {Beckmannia syzigachne (Steudel) Fernald in der Lewitz},
	journal = {Botanischer Rundbrief f{\"u}r den Bezirk Neubrandenburg},
	volume = {12},
	year = {1981},
	month = {1981///},
	author = {E. Richter}
}
@article {7163,
	title = {El g{\'e}nero Echinochloa Beauv. en el suroeste de Europa. An. Jard},
	journal = {Bot. Madrid},
	volume = {38},
	year = {1981},
	month = {1981///},
	pages = {91 - 108},
	author = {J.L. Carretero}
}
@article {7301,
	title = {Elaeagnus umbellata on Dartford Heath, w. Kent},
	journal = {BSBI News},
	volume = {27},
	year = {1981},
	month = {1981///},
	author = {J.R. Palmer}
}
@article {7151,
	title = {The evolution of Bromus inermis and related species of Bromus sect. Pnigma},
	journal = {Bot. Jahrb},
	volume = {102},
	year = {1981},
	month = {1981///},
	pages = {427 - 443},
	author = {K.C. Armstrong}
}
@article {7156,
	title = {Der Bromus pectinatus-Komplex (Gramineae) im Nahen und Mittleren Osten},
	journal = {Bot. Jahrb. Syst},
	volume = {102},
	year = {1981},
	month = {1981///},
	pages = {471 - 495},
	author = {H. Scholz}
}
@article {7158,
	title = {Bestimmungsschwierigkeiten bei europ{\"a}ischer Bromus-Arten},
	journal = {Bot. Jahrb. Syst},
	volume = {102},
	year = {1981},
	month = {1981///},
	pages = {459 - 469},
	author = {K. Ammann}
}
@article {dum200,
	title = {Vegetaties met Juncus canadensis J. Gay ex Laharpe in de Kempen},
	journal = {Dumortiera},
	volume = {19-20},
	year = {1981},
	month = {11/1981},
	pages = {2-11},
	chapter = {2},
	abstract = {Vegetations with Juncus canadensis J. GAY ex LAHARPE in the Campine district.
This study describes a few sites of Juncus canadensis in the Campine district, a species that was first found in Belgium in 1975. Now there are known about twenty sites, all of them in the Campine district. The stands of Juncus canadensis in Belgium are not typical. The species seems to appear in stands with rather different characters of acidity, moisture and nutritional ecology. The most constant environment of Juncus canadensis is the littoral area of slightly eutrophic, disturbed fens and lakes.
The following types of marsh vegetation with Juncus canadensis may be distinguished:
{\textemdash} vegetations with Littorellion-eleaients such as Eleocharis multicaulis, Scirptis fluitans and Hypericum elodes.
{\textemdash} marsh vegetations with Molinia caerulea, Junais bulbosus, J. effusus, Hydrocotyle vulgaris, Carex rostrata, Drepanocladus fluitans and Sphagnum spp.
{\textemdash} acid bog vegetations: Sphagno-Rhynchosporetum albae in Erica-vegetations.},
	author = {Dick Van Straaten}
}
@article {133,
	title = {Un mode curieux d{\textquoteright}introduction de phan{\'e}rogames adventices par les fumures},
	journal = {Dumortiera},
	volume = {19-20},
	year = {1981},
	pages = {26-28},
	chapter = {26},
	author = {A. Sotiaux and Roegiers and De Zuttere}
}
