BY E. C. ANDREWS. 557 



Brown proposed to raise it to generic rank, under the name of 

 Eudesmia. 



A third group comprises the Ironbarks and the Boxes, charac- 

 terised by the possession of small anthers opening in pores, of 

 peculiar barks and timbers, and a predominance of eineol.* The 

 members of the group are numerous. They are confined to the 

 Eastern half of the continent, and they grow, as a rule, in the 

 heavier clay-soils, in contradistinction to the barren, sandy soils 

 chosen by the Bloodwoods. 



It is instructive, in this connection, to remember that the alluvial 

 plains of Australia were formed during a period subsequent to the 

 origin of the early Eucalypts. The Box-Ironbark group repre- 

 sents a main, but double, limb springing from the generalised type, 

 at a period later than the secretion of eineol and phellandrene. 

 The extreme twigs of this great, double limb, represent types such 

 as E. melliodora, E. sideroxylon, E. Cayleyi, E. leucoxylon, E. 

 gracilis, and E. uncinata, and are the farthest removed from the 

 direct line of succession, in the genealogical tree of the Eucalypts, 

 besides being far removed, also, from the generalised type of the 

 Myrtaceae. 



A fourth group comprises the Stringybarks, the Peppermints 

 and allied types, which possess kidney-shaped anthers of two types, 

 each opening indivergent and confluent slits; peculiar leaves, fruits, 

 and bark; as also a preponderance, in the main, of phellandrene 

 oil and piperitone.f These grow in moist, and cool to cold climates, 

 and are confined to the Southeastern portion of the continent, 

 particularly in the plateau and mountainous regions of recent 

 origin. E. acmenioides, E. Naudiniana, and E. microcorys\ are 

 aberrant types of the group. 



* For analyses of these oils, see "Research on the Eucalypts." Baker 

 and Smith (1902). 



f This subject of the oils is dealt with by Messrs. Baker and Smith, in 

 their " Research on the Eucalypts " (1902), forming a very valuable con- 

 tribution to the hypothesis of the origin of the Eucalypts. 



+ Mr. J. H. Maiden appears to have been the first to consider E. micro- 

 corys and E. Naudiniantx as anomalous forms, from a consideration of their 

 anthers. [Critical Revision of the Genus Eucalyptus]. 



