i Bo EUCALYPTUS. 



/ 



shedding on detachment of the latter; fertile seeds usually outside, dark 

 brown; sterile seeds mostly pale brown and smaller than the others. 



To classify the species of so large a genus is no easy task. The 

 system of classification adopted below is based on the structure of the 

 anthers, the position of the valves, the shape of the lid, the style of 

 inflorescence, and the similarity or dissimilarity of the two leaf surfaces. 

 The first thing to ascertain about a Eucalyptus that one wishes to identify 

 is the structure of the anthers. This can usually be done with a good 

 lens by examining anthers from buds just ready to open. It is hoped 

 that the accompanying plate and artificial key preceding each section of 

 che genus will aid in the work of identification. In using the key to a 

 section, the first thing to ascertain is whether the valves of a mature seed 

 vessel are enclosed within it or project partly or wholly from the mouth. 



I, RENANTHEREAE. 



Anthers mostly broader than long, usually kidney-shaped, opening 

 anteriorily by divergent, upward confluent slits. (Umbels generally 

 solitary. Fertile and sterile seeds mostly of the same shape.) 



ARTIFICIAL KEY. 



A. Valves completely enclosed B. 

 A. Valves partly exserted C. 

 A. Valves completely exserted 1-3. 

 B. Lid hemispheric 4-11. 



B. Lid not hemispheric D. 



C. Lid hemispheric E. 



C. Lid not hemispheric 12-13. 



D. Leaves equally green 14-15. 



D. Leaves unequally green 16-17. 



E. Leaves equally green 18-19. 

 E. Leaves unequally green 20-21. 



1. E. Santalifolia, F. M. Dwarf; leaves thick, rather narrow, 

 equally green, shining; umbels solitary, stalklets almost none, lid semi- 

 ovate-conical; outer stamens straight in bud, anthers roundish-cordate; 

 fruits hemispheric below, border broad, convex, emersed, valves very 

 short, exserted. 



2, E. Capitellata, Sm. Leaves thick, elongated, rather less 

 shining beneath, very inequilateral at the base; umbels axillary, stalk- 

 lets none, lid hemispheric; fruits semiovate below, border broad, convex, 

 emersed, valves much exserted. 



