126 



a. Historical. 



Cotyledones (sic.) broad, much compressed, somewhat folded, undivided or 

 bilobed, curved around the cylindrical straight erect radicle." (" Eucalyptographia," 

 Preface.) 



1866. Bentham (B. Fl., iii) rarely refers to the Cotyledon. Exceptions are — 



" Embryo with broad cordate 2-lobed or bipartite cotyledons, folded over the straight radicle, but 

 otherwise flat." (p. 185.) 



"... varies much in the shape of the cotyledons, very broad or rather narrow, entire, cordate, 

 2-lobed or 2-partite . . ." (p. 188.) 



One of the few specific references is under E. cornuta, " Cotyledons of the seeds very deeply lobed 

 almost 2-partite." 



1879-84. Mueller, in " Eucalyptographia/' under E. cornuta, figures twenty- 

 seven species of seedlings " to exhibit mainly the cotyledonary leaves." The seedlings 

 are quite small, and as a rule also depict the first pair of leaves after the cotyledons. 

 That of E. sepulcralis F.v.M. is figured on its own plate, and is the only seedling 

 so found. Taken as a whole, the drawings of the seedlings are not quite satisfactory. 

 The species depicted under E. cornuta are as follows : — 



E. alpina. E. leucoxylon. 



E. amygdalina. E. macrocarpa. 



E. botryoides. E. marginata. 



E. calophylla. E. melliodora. 



E, cornuta. E. obliqua. 



E. corymbosa. E. pilularib. 



E. cosmophylla. E. piperita. 



E. crebra. E. rostrata. 



E. diversicolor. E. saligna. 



E. gamophylla. E. siderophloia. 



E. globulus. E. Sieberiana. 



E. goniocalyx. E. stricta. 



E. Ounnii. E. Stuartiana. 

 E. hemiphloia. 



The next reference in order of date, if not actually prior to Mueller's, is an 

 follows : — 



1883. Naudin, of which I offer a translation : — - 

 " In all species of Eucalyptus the cotyledons have a common physiognomy, which makes them 

 easily recognised. They are always petiolate and opposite, their most habitual form is that of a heart, 

 broader than long, having the two lobes separated by a hollowing more or less deep. In some species they 

 are almost orbicular and entire, in others the median hollowing descends almost to the base of the limb 

 which is thus also divided into two straight and diverging lobes. These different modifications may help 

 in the recognition of some species, however, it is not a criterion sufficiently constant and sure to be trusted 

 in every case." (Naudin, i, 346, 1883.) 



In other words, he issues a warning as to variation in cotyledons. 



