Contents of 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; 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.

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.

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.