INSTRUCTIONS FOR USING THE KEY. 

 It is first necessary that field notes be taken concerning: — 

 Whether species is a tree, or Mallee, etc. 



(a) Texture of the bark. 



(b) Character and colour of the bark. 



(c) Colour of the timber (heartwood). 



(d) Habitat. 



Specimens of such leaves, fruits, and buds as may be available should then be 

 secured and studied in conjunction with the notes and diagrams contained in the 

 key, in the following order: — 



(e) Fruit (shape of the mature fruit). 



(f) Valves of the mature fruit. 



(g) Operculum, or bud-cap of the unopened bud. 



(h) Leaves, their colour, and whether stalked, or without a leaf-stalk. 



As each characteristic is located in the key, a number is built up, but care 

 must be taken to keep numbers in the correct order, and place an in any position 

 when information is not available concerning any characteristic. 



The number built up by the use of the whole, or part of the key is then 

 referred to the numbered list of species on pages 10 to 13 and the name read off. 



The first four decimal places may serve to determine a species, in which 

 case the other characteristics may be read off the key and used to check the correct- 

 ness of the diagnosis. 



For example, let us take the Karri: — 



Our note book gives the following information — 

 •1 Texture of bark — 'Smooth throughout. 



•01 Character and colour of bark — Thick, and smooth. 

 •002 Colour of the heartwood — Red. 

 • 0001 Habitat— South- West. 



Thus, up to the present, we have number 1121. 



If we now consult the list we find there are three species having this number; 

 and reference to the descriptive notes of each species will show that height, shape 

 of tree, and habitat preclude the possibility of it being any species other than 

 Karri (Eucalyptus diversicolor) . 



The other alternative is to continue the use of the key by referring the other 

 features in the order given, or selecting one feature which from the number quoted 

 in the key is different in each of the three species, as, for instance, the shape of the 

 fruit. 



A.— KEY TO THE ARBORESCENT SPECIES (page 7). 



v B.— KEY TO THE MALLEES AND MARLOCKS (page 15). 



