496 EVOLUTION OF THE EUCALYPTS, 



ii.(c^). Eucalypts witb cotyledons obtusely oblong, slightly 

 emarginate: sometimes slightly lobed. 



This and the next two groups are the most difficult to differ- 

 entiate. It is at most a tentative classification, but was done in 

 default of any other. The forms and relations of the Eucalypts 

 with small cotyledons are many, and they merge so into one 

 another, that it is quite possible, in the light of further know- 

 ledge, these groups will have to be altogether recast. They com- 

 prise the "Ironbarks" and "Boxes" with anthers opening in 

 pores, also most of the " Parallelantherse " whose anthers are 

 parallel. Most of the eucalyptol-pinene species come in these 

 groups, also many of those containing aromadendral. A few of 

 the eucalyptol -pinene-phellandrene species are also included, but 

 the piperitone-phellandrene and piperitone-phellandrene-euca- 

 lyptol oils are not represented. I have kept the " Ironbarks " 

 together, for purposes of comparison. 



E. hotryoides Sm.(Pl.xlii., fig.2). — Cotyledons obtusely oblong, 

 emarginate, 0'55 x 0*2, petiole 0-4 cm. Leaves opposite for first 

 three pairs, then alternate, entire, glabrous, lanceolate, obtuse, 

 petiolate, venation somewhat oblique, drying pale green. First 

 pr. I'l X 0-5, petiole 0*3; second 2-5 x 0*7, petiole 0-5; third 35 x 1, 

 petiole 0*5 cm. Stem terete, glabrous. First internode 0*6, 

 second 0*6, third 1 -5 cm. 



E . saligna Sm. (PI. xlii., fig. 3). — Cotyledons smaller and lobes 

 at a more acute angle than in E . hotryoides^ hence the emargina- 

 tion is deeper, lamina 0*45 x 0-18, petiole 0-3 cm. Leaves opposite, 

 tending soon to alternate, glabrous, petiolate, lanceolate, obtuse, 

 venation obscure, leaves dark green. First pr. 0*6 x 0*2, petiole 

 0-3; second 1-5 x 0-3, petiole 0-5; third 1-8 x 0-6, petiole 0-5 cm. 

 Stem terete, glabrous. First internode 0-6, second 1-2, third 1, 

 fourth 1-2 cm. 



E. rohusta Sm. (PI. xlii., fig 4).~ Cotyledons of same form but 

 smaller than in E. saligna, lamina 0*3 x 0*15, petiole 0-2 cm. 

 Leaves opposite, entire, glabrous, dark green, obtuse, lanceolate, 

 petiolate, venation obscure, somewhat oblique. First pr. 1 x 0-15, 

 petiole 0-3; second 1*2 x 0-4, petiole 0-5; third 2-5 x 0-9, petiole 

 0-6; fourth 3-3 x 12, petiole 0-6cm. Stem terete, glabrous. First 

 internode 0*7, second 0-8, third 1'2, fourth To cm. 



