J. E.  Lousley and Kent, D. H., Docks and knotweeds of the British Isles (BSBI Handbook n° 3). BSBI, London, 1981.

H.  Scholz, Grass weeds II. Documenta, Ciba-Geigy, Basle: XX, 1981.

J.  Chrtek, ?Schkuhria pinnata v ?eskoslovensku?, Zpr. ?s. Bot. Spole?., Praha, vol. 16, no. 1, pp. 11 - 13, 1981.

H.  Scholz, ?Bemerkungen über Bromus madritensis und B. rubens (Gramineae)?, Willdenowia, vol. 11, pp. 249 - 258, 1981.

J.  Ebinger and Lehnen, L., ?Naturalised autumn olive in Illinois?, Trans. Illin. Acad. Sci, vol. 74, pp. 83 - 85, 1981.

J. P.  Murphy, ?Senecio x albescens Burbidge & Colgan at Killiney, Co. Dublin: a seventy-eight years old population?, Watsonia, vol. 13, pp. 303 - 311, 1981.

W.  Hodgson and Mittleman, M., ?Coronilla varia L. (Leguminosae), a new addition to the flora of Arizona?, Saguaroland Bull, vol. 35, no. 3, pp. 28 - 29, 1981.

D. J.  Sieren, ?The taxonomy of the genus Euthamia?, Rhodora, vol. 83, pp. 551 - 579, 1981.

R. D.  Webster and Hatch, S. L., ?Taxonomic relationships of Texas specimens of Digitaria ciliaris and Digitaria bicornis (Poaceae)?, Sida, vol. 9, pp. 34 - 42, 1981.

E.  Weinert, ?Asclepias syriaca L., im herzynischen Florengebiet?, Mitt. Florist. Kart, vol. 7, pp. 127 - 130, 1981.

G. A.  Marley and Wagner, W. L., ?Bromus diandrus Roth (Poaceae)?, Madrono, vol. 28, no. 1, 1981.

J. P. M.  Brenan, ?The genus Amaranthus in Southern Africa?, J. S. African Bot, vol. 47, pp. 451 - 492, 1981.

H.  Diekjobst, ?Atriplex hastata- und Bidens radiata-Gesellschaft im therophytischen Vegetationskomplex am Möhnesee?, Natur und Heimat, vol. 41, pp. 3 - 12, 1981.

R. W. J. M.  Van der Ham, ?De Virginische kruidkers?, Lepidium virginicum L., in Limburg. Natuurhist. Maandblad, vol. 70, pp. 101 - 105, 1981.

J. H.  Dickson and Walker, A., ?What it the Scottish thistle?, Glasgow Nat, vol. 20, pp. 101 - 121, 1981.

T.  Hymowitz and Newell, C. A., ?Taxonomy of the genus Glycine, domestication and uses of soybeans?, Economic Botany, vol. 35, no. 3, pp. 272 - 288, 1981.

W.  _ukowski, ?Rozmieszczenie Artemisia scoparia W. K. w Polsce. Bad?, Fizjogr. nad Polsk_ Zach, vol. 32, pp. 115 - 121, 1981.

A. A.  Saenz, ?Coreopsis lanceolata L. (Asteraceae - Heliantheae), nueva especie adventicia para la flora Argentina?, Darwiniana, vol. 23, no. 1, pp. 317 - 319, 1981.

F. O.  Zuloaga, ?El género Panicum (Gramineae) en la Republica Argentina, 2?, Darwiniana, vol. 23, pp. 233 - 256, 1981.

K. M.  Klemow and Raynall, D. J., ?Population ecology of Melilogus alba in a limestone quarry. J?, Ecol, vol. 69, pp. 33 - 44, 1981.

A.  Sotiaux, ,, and Zuttere, D., ?Un mode curieux d?introduction de phanérogames adventices par les fumures?, Dumortiera, vol. 19-20, pp. 26 - 28, 1981.

A. P.  Wharton, ?The foxglove trees?, Davidsonia, vol. 12, no. 3, pp. 57 - 61, 1981.

E. J.  Clement, ?Aliens and adventives. Adventive news 21. Notes on some alien pepperworts?, BSBI News, vol. 29, pp. 8 - 13, 1981.

E. J.  Clement, ?Three Panicums?, BSBI News, vol. 27, 1981.

E. J.  Clement, ?Aliens and adventives. Adventive news 18. Petasites albus?, BSBI News, vol. 26, 1981.

E. J.  Clement, ?Adventive news 21. Mixed bag?, BSBI News, vol. 29, pp. 10 - 13, 1981.

E. J.  Clement, ?Bulbous canarygrass in Britain?, BSBI News, vol. 27, 1981.

E. J.  Clement, ?Confusion between white and Japanese millets?, BSBI News, vol. 27, pp. 16 - 18, 1981.

E. J.  Clement, ?Sweet bromegrass in Britain?, BSBI News, vol. 28, pp. 12 - 14, 1981.

E. J.  Clement, ?Rough bentgrass in Britain?, BSBI News, vol. 27, pp. 18 - 20, 1981.

E.  Richter, ?Beckmannia syzigachne (Steudel) Fernald in der Lewitz?, Botanischer Rundbrief für den Bezirk Neubrandenburg, vol. 12, 1981.

J. L.  Carretero, ?El género Echinochloa Beauv. en el suroeste de Europa. An. Jard?, Bot. Madrid, vol. 38, no. 1, pp. 91 - 108, 1981.

J. R.  Palmer, ?Elaeagnus umbellata on Dartford Heath, w. Kent?, BSBI News, vol. 27, 1981.

K. C.  Armstrong, ?The evolution of Bromus inermis and related species of Bromus sect. Pnigma?, Bot. Jahrb, vol. 102, pp. 427 - 443, 1981.

H.  Scholz, ?Der Bromus pectinatus-Komplex (Gramineae) im Nahen und Mittleren Osten?, Bot. Jahrb. Syst, vol. 102, pp. 471 - 495, 1981.

K.  Ammann, ?Bestimmungsschwierigkeiten bei europäischer Bromus-Arten?, Bot. Jahrb. Syst, vol. 102, pp. 459 - 469, 1981.

D.  Van Straaten, ?Vegetaties met Juncus canadensis J. Gay ex Laharpe in de Kempen?, Dumortiera, vol. 19-20, pp. 2-11, 1981.

A.  Sotiaux, ,, and Zuttere, D., ?Un mode curieux d?introduction de phanérogames adventices par les fumures?, Dumortiera, vol. 19-20, pp. 26-28, 1981.