130 



Amongst a number of individual species there is so much variation that it ia 

 difficult, and sometimes impossible, to separate them on their emarginate character, 

 or lack of it. 



' The cotyledons are transversely oblong, with or without a shallow sinus at the 

 apex, with a short midrib terminating at the sinus . . ." (Lubbock, i, 525.) 



Dr. Cuthbert Hall (op. tit., p. 478) has made the question of entire and emarginate 

 cotyledons of some importance. He even makes it a basis of classification : — 



I. Entire Cotyledons. 



(a) Bloodwoods or Corynibosas, characterised by very large or medium-sized cotyledons, usually 

 reuiform in shape, and resembling those of the Angophoras. 



(b) Of medium size to small, reniform, entire . . . mainly Stringybarks with reniform anthers. 



(c) Small, reniform or orbicular. E. dumosa, E. populifolia, E. quadrangulata. E. polybraclea, 

 (fruticetorum), E. incrassata. 



II. Emarginate Cotyledons. 



(a) Large, obcordate, cuneate at base, petioles long, E. marginala, E. Todtiana, E. megacarpa, 

 E. santalifolia (diver sifolia). The lastnamed shades off into the following group. 



(b) Medium to small, emargination moderate, slight or even practically absent. ... In most 

 cases, the undersides of the leaves and cotyledons are tinged deep purplish-red. Most of the species contain 

 Eucalyptol (cineol), and many phellandrene and piperitone. The anthers are generally reniform. 



(Then follows a list of species all of which are RenantheraB except E. striaticalyx. It includes 

 E. Planchoniana.) 



(c 1 ) Smaller, more or less transversely oblong, emargination moderate or very slight. ... In 

 this group may be placed the Ironbarks and most of the Boxes with anthers opening by pores ; the remainder 

 mostly have parallel anthers. 



(c 2 ) Very small, transversely oblong or triangular, emargination slight or practically absent . . . 

 AVhere the petiole is so small, it is sometimes almost impossible to know whether to put some of these in this 

 group or in (I (c). 



(The members of this group are moderately variable as regards anthers.) 



(c 3 ) Larger than in II (c 1 ), more deeply emarginate, lobes obovate-oblong, obtuse, divergent. . . . 

 It will be seen that this group shades off from (c 1 ), just as (c 2 ) may be taken to shade off from (c l ) in the 

 other direction. Comprised in it are E. eudesmioides, E. gomphocephala, E. Lekmanni, E. cosmophylla, 

 E. cladocalyx, E. hemilampra, E. elwophora, E. goniocalyx, E. urnigera, E. unialata, E. Maideni, E. globulus. 



e. Venation. 



" . . . . with a short midrib terminating in the sinus, and a longer lateral 

 nerve running along the centre of the lateral lobes. They are practically, therefore, 

 trinerved, but the whole of the venation is sometimes obscure or indiscernible owing 

 to the opacity of the cotyledons." (Lubbock, i, 525.) Venation is a character taken 

 cognisance of in the seedlings, when describing the cotyledons. 



Subsequent pairs of leaves (No. 5). — All pairs beginning with the second pair 

 and ending just before the alternate leaves. There is considerable range in the number 

 of pairs and in their shape. 



