Geographic Origin of the Material

Plant material was collected during numerous field tours and expeditions. The geographic origin of the investigated specimens and the species nomenclature are summarized in Table 1. Details are given at http:llwww.wsl.chldendrolxylemdblindex.php.

Clearly, the largest fraction of plants (about 80%) originated from Europe. Species from outside Europe served mainly to enlarge the taxonomic range and to demonstrate anatomical similarities between tectonically early separated regions.

Table 1. Geographic origin of the sampled species.

Continent

Region

Country

No. of species

Nomenclature

Scandinavia and Svalbard

Sweden, Finland, Norway, Russia

3

Tutin et al. 1964

Western Siberia

Russia

81

Tutin et al. 1964

Europe

Central

Austria, France, Germany, Hungary, Poland, Romania, Slovakia, Slovenia, Switzerland

812

Aeschimann et al. 2004 Lauber and Wagner 2001 Eggenberg and Möhl 2007 Rothmaler, 2005

West

England

13

Tutin et al. 1964

South

Greece, Italy, Portugal, Spain, Ex-Yugoslavia

242

Tutin et al. 1964

Bramwell and Bramwell 2000

Macaronesia

Canary Islands, Madeira

160

Hohenester and Wels 1993 Schönfelder and Schönfelder 1997

Africa

North

Algeria, Egypt, Etiopia, Libya, Marocco, Tunesia

49

Ozenda 1983

Arabian Peninsula

Oman

38

Miller and Morris 1988 Jagiella and Kürschner 1987

Central

Mongolia

3

determined by H. Heklau, Halle, Germany

Asia

Near East

Georgia, Iran, Israel

52

Flora of Georgia

South East

wood collection various countries

5

North

USA, Canada

184

Weber 1976 Epple 1995

America

South

Argentina, Chile

13

determined by Prof. F. Roig sen.

Oceania

Australia and New Zealand

Australia (New South Wales) and New Zealand (South Island)

2

Costerman 1989 NZ species determined by H. Ullmann, Würzburg, Germany

Total

Total

1657

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