Fig. 1: Map of southern Chile and Argentina showing vegetation zones. The zone N. betuloides and N. antarctica is dominated exclusively by N. antarctica in eastward and drier regions. The unshaded areas to the east are tussock grassland and low shrubland; from Godley (1960) with his permission. Keys to localities mentioned in text: 1 Agua Fresca; 2 Bahia Morris; 3 Cabo San Isidro; 4 Cordillera Chilena; 5 Cutter Cove; 6 Estancia El Condor; 7 Faro Evangalistas; 8 Fiordo Parry; 9 Isla Capitan Aracena; 10 Lago El Parillar; 11 Parque Nacional Lapataia; 12 Estancia Maria Cristina; 13 North boundary Magallanes Province, Chile; 14 Pecket Harbour; 15 Peninsula de Brunswick; 16 Primera Angostura; 17 Puerto Natales; 18 Punta Arenas; 19 Punta Dungenes; 20 Rio Caleta; 21 Rio Gallegos; 22 Rio Rubens; 23 Ushuaia.