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By Reinhard Friedrich Stettler

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L. Daly, Production Technician Publication Proposals: Proposals for the NRC Monograph Publishing Program should be sent to Gerald J. Neville, Head, Monograph Publishing Program, National Research Council of Canada, NRC Research Press, 1200 Montreal Road, Building M-55, Ottawa, ON K1A 0R6, Canada. ca © National Research Council of Canada 1996 All rights reserved. No part of this publication may be reproduced in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of the National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada.

Isebrands, W. Johnson, D. Karnosky, M. Krasny, P. Larson, Y. Linhart, T. Martin, S. Merkle, M. Ostry, S. Pallardy, S. Pezeshki, J. Pinon, P. Schulte, J. Stromberg, C. Tauer, M. Tjoelker, M. Villar, N. Wheeler, R. Wu, S. Wullschleger, and G. Wyckoff. We are indebted to them for their efforts. Special thanks go to Lynn Catlett who provided invaluable staff assistance from the beginning to the end of the project. Daniel and Andrea Stettler offered their graphics expertise for the design of the book cover.

So, did the common features of willows and aspens evolve in parallel or did one group derive from the other? Species of Salix appear later in the fossil record than poplars (Collinson 1992), but even this is hardly decisive and the problem remains open. Analysis of additional genes in a careful selection of poplars and willows may help to settle the issue. Relationship to other families Salicaceae have traditionally been considered taxonomically isolated from other families, enough so as to merit recognition of the separate order Salicales.

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