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Vol. 18 of Watsonia, edited by J.R. Akeroyd, J.R. Edmondson, R.J. Gornall, C.D. Preston & B.S. Rushton. Papers are provided here free for personal use, but remain copyright of the BSBI and may not be reproduced or sold without permission.
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Milne-Redhead, E. 1990. The B.S.B.I. Black Poplar survey, 1973-88. Watsonia 18, 1-5. pdf 633kb.
McAllister, H.A. & Rutherford, A. 1990. Hedera helix L. and H. hibernica (Kirchner) Bean (Araliaceae) in the British Isles. Watsonia 18, 7-15. pdf 2.04Mb.
Binggeli, P. 1990. Detection of protandry and protogyny in Sycamore (Acer pseudoplatanus L.) from infructescences. Watsonia 18, 17-20; pdf 208kb.
Kelly, D.L. 1990. Cornus sericea L. in Ireland: an incipient weed of wetlands. Watsonia 18, 33-36; pdf 355kb.
Foley, M.J.Y. 1990. The current distribution and abundance of Orchis ustulata L. in southern England. Watsonia 18, 37-48. pdf 2.91Mb.
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; pdf 918kb.
Crackles, F.E. 1990. Hypericum x desetangsii Lamotte nm. desetangsii in Yorkshire, with special reference to its spread along railways. Watsonia 18, 63-67; pdf 385kb.
Gulliver, R.L. 1990. The rare plants of the Howardian Hills, North Yorkshire, 1794-1988. Watsonia 18, 69-80; pdf 928kb.
Short Notes. Watsonia 18, 81-95; pdf 1.18Mb.
- 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.
Simpson, D.A. 1990. Displacement of Elodea canadensis Michx by Elodea nuttalli (Planch.) H. St. John in the British Isles. Watsonia 18, 173-177; pdf 2.81Mb.
Obituaries: E.M. Booth, J.C. Gardiner, C.C. Haworth, A.G. Kenneth, G.M. Spooner & A. Younger. Watsonia 18, 238-246; pdf 631kb.
Ettlinger, D.M. 1991. Two new varieties of British Dactylorhiza. Watsonia 18, 307-309; pdf 152kb.
Rumsey, F.J. & Jury, S.L. 1991. An account of Orobanche L. in Britain and Ireland. Watsonia 18, 257-295. pdf 5.11Mb.
Hobson, D.D. 1991. The status of Populus nigra L. in the Republic of Ireland. Watsonia 18, 303-305; pdf 2.35Mb.
Flinck, K.E. & Hylmo, B. 1991. Two new species of Cotoneaster. Watsonia 18, 311-313. pdf 416kb.
Short Notes: Watsonia 18, 315-321; pdf 364kb:
- 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; pdf 621kb.
Silverside, A.J. 1991. The identity of Euphrasia officinalis L. and its nomenclatural implications. Watsonia 18, 343-350; pdf 607kb.
Horsman, F. 1991. A new dactylorchid hybrid. Watsonia 18, 395-399; pdf 239kb.
Short Notes: Watsonia 18, 401-417; pdf 1.35Mb.
- 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.
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