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Milne-Redhead, E. 1990. The B.S.B.I. Black Poplar survey, 1973-88. Watsonia 18, 1-5
McAllister, H.A. & Rutherford, A. 1990. Hedera helix L. and H. hibernica (Kirchner) Bean (Araliaceae) in the British Isles. Watsonia 18, 7-15
Binggeli, P. 1990. Detection of protandry and protogyny in Sycamore (Acer pseudoplatanus L.) from infructescences. Watsonia 18, 17-20
Kelly, D.L. 1990. Cornus sericea L. in Ireland: an incipient weed of wetlands. Watsonia 18, 33-36
Foley, M.J.Y. 1990. The current distribution and abundance of Orchis ustulata L. in southern England. Watsonia 18, 37-48
Gosler, A.G. 1990. Introgressive hybridization between Crataegus monogyna Jacq. and C. laevigata (Poiret) DC. in the Upper Thames Valley, England. Watsonia 18, 49-62
Crackles, F.E. 1990. Hypericum x desetangsii Lamotte nm. desetangsii in Yorkshire, with special reference to its spread along railways. Watsonia 18, 63-67
Gulliver, R.L. 1990. The rare plants of the Howardian Hills, North Yorkshire, 1794-1988. Watsonia 18, 69-80
Short Notes. Watsonia 18 (1990), 81-95
- Allen, D.E. Micromorphy in New Forest Rubi
- Brewis, A. Yellow Ivy Broomrape
- Dalby, D.H. A new combination in Cochlearia (Cruciferae)
- Dawson, H.J. Chromosome numbers in two Limonium species
- Gilbert, O.L. Wild figs by the River Don, Sheffield
- Halliday, G. Crepis praemorsa (L.) Tausch, new to western Europe
- Horsman, F. The first record for Vaccinium uliginosum L. var. pubescens (Wormsk.) Hornem. from the British Isles
- Kent, D.H. The Shasta Daisy
- Newton, A. Rubus stenopetalus Lef. & Muell. in Britain
- Preston, C.D. Potamogeton filiformis Pers. in Anglesey
- Sell, P.D. Some new combinations in the British flora
- Sell, P.D. The typification and nomenclature of Erica mackaiana Bab.
- Webb, C.J. New Zealand species of Hydrocotyle (Apiaceae) naturalised in Britain and Ireland.
Graham, G.G. & Primavesi, A.L. 1990. Notes on some Rosa taxa recorded as occurring in the British Isles. Watsonia 18, 119-124
Silverside, A.J. 1990. The nomenclature of some hybrids of the Spiraea salicifolia group naturalized in Britain. Watsonia 18, 147-151
Foley, M.J.Y. 1990. An assessment of populations of Dactylorhiza traunsteineri (Sauter) Soo in the British Isles and a comparison with others from Continental Europe. Watsonia 18, 153-172
Simpson, D.A. 1990. Displacement of Elodea canadensis Michx by Elodea nuttalli (Planch.) H. St John in the British Isles. Watsonia 18, 173-177
Newton, A. & Porter, M. 1990. Five brambles from Wales. Watsonia 18, 189-198
Short Notes. Watsonia 18 (1990), 199-213
- Hieracium britannicum F.J. Hanb. in Wales. J. Bevan.
- Cardamine amara: its occurrence in montane habitats in Britain. R.W.M. Corner.
- The distribution of Carex appropinquata Schumacher (C. paradoxa Willd.) in Great Britain and Ireland. R.W. David.
- The Cumbrian herbarium of W.H. Youdale. H. Hofmann, J.R. Edmondson & G. Halliday.
- Alopecurus bulbosus Gouan in Dorset. D. Pearman.
- The origin and taxonomy of Spartina x neyrautii Foucaud. A.F. Raubould, A.J. Gray, M.J. Lawrence & D.F. Marshall.
- Rumex acetosa L. subsp. biformis (Lange) Valdes-Bermejo & Castroviejo in Britain. K.H. Rechinger.
- A new hybrid binomial in Mimulus L. A.J. Silverside.
- New names and combinations in the British flora. C.A. Stace.
Obituaries: E.M. Booth, J.C. Gardiner, C.C. Haworth, A.G. Kenneth, G.M. Spooner & A. Younger. Watsonia 18, 238-246
Ettlinger, D.M. 1991. Two new varieties of British Dactylorhiza. Watsonia 18, 307-309
Rumsey, F.J. & Jury, S.L. 1991. An account of Orobanche L. in Britain and Ireland. Watsonia 18, 257-295
Hobson, D.D. 1991. The status of Populus nigra L. in the Republic of Ireland. Watsonia 18, 303-305
Flinck, K.E. & Hylmo, B. 1991. Two new species of Cotoneaster. Watsonia 18, 311-313
Short Notes. Watsonia 18 (1991), 315-321
- A new subspecies of Festuca rubra L. A.-K.K.A. Al-Bermani & C.A. Stace.
- Abnormal flowers in Platanthera chlorantha (Custer) Reichenb. and Gymnadenia conopsea (L.) R.Br. subsp. conopsea. F. Horsman.
- A nonresupinate abnormality in Orchis purpurea Hudson. G.I.C. Ingram & C.W. Dunster.
- A new subspecies of Gymnadenia conopsea (L.) R.Br. F. Rose.
- New names and combination for three hybrids. C.A. Stace.
Lack, A.J. & Diaz, A. 1991. The pollination of Arum maculatum L. - a historical review and new observations. Watsonia 18, 333-342
Silverside, A.J. 1991. The identity of Euphrasia officinalis L. and its nomenclatural implications. Watsonia 18, 343-350
Horsman, F. 1991. A new dactylorchid hybrid. Watsonia 18, 395-399
Short Notes. Watsonia 18 (1991), 401-417
- Anthyllis vulneraria L. subsp. subsp. polyphylla (DC.) Nyman, an alien Kidney-vetch in Britain. J.R. Akeroyd.
- Bevan’s Bittercress: the small, white-flowered variant of Cardamine x fringsii Wirtgen also present in Britain. D. Bevan & T.C.G. Rich.
- The status of Pulicaria vulgaris Gaertner in Britain in 1990. C. Chatters.
- Carex x gaudiniana Guthnick - a rarity? R.W. David.
- The status of Oenothera cambrica Rostanski and O. novae-scotiae Gates (Onagraceae). W. Dietrich.
- A new variant of Ophrys apifera Hudson in Britain. D.C. Lang.
- Salix x seminigricans A. & G. Camus: a willow hybrid new to the British Isles. R.D. Meikle.
- The typification of Ranunculus bachii Wirtg. P.D. Sell & S.D. Webster.
- Three new grass combinations. C.A. Stace.
- Festuca arundinacea Schreb. var. strictior (Hack.) K. Richt. P.J.O. Trist.
- Contributions to a cytological catalogue of the British and Irish flora, 1. J.E. Wentworth, J.P. Bailey & R.J. Gornall.
Book reviews. Watsonia 18 (1991), 437-445
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