COMPOSITE 105 



different tribes may be grouped. The cotyledons of Eudbeckia 

 serotina are shortly petiolate, while the first three leaves are 

 ovate or lanceolate, and trinerved, with long petioles. The 

 cotyledons of Guizotia abyssinica are pubescent as are the two 

 lanceolate primary leaves. The first two of Senecio erucse- 

 folius (fig. 475) are oval, smooth and entire, while the ultimate 

 leaves vary from pinnatifid and pinnatipartite forms to those 

 that are twice divided. The cotyledons are oval and entire 

 immediately after germination, but they soon become emar- 

 ginate and ultimately orbicular. The emargination is due to 

 the more rapid growth of the sides as compared with the apex. 

 Those of Leuceria senecioides are rotund, emarginate, cuneate 

 at the base and ciliate when young. The two primary leaves 

 are obovate or cuneate and repandly dentate or shallowly 

 lobed, penninerved and finely pubescent. The cotyledons of 

 Odontospermum spinosum are oblong-orbicular, entire, gla- 

 brous, and much larger than the first two leaves which are 

 oblanceolate and coarsely hairy. A striking departure from 

 the above is met with in Senecio cruentus which has oblong- 

 ovate or roundly ovate, subemarginate cotyledons, also auricled 

 at the base, or slightly cordate, with slender petioles. The 

 hypocotyl is very short. This differs widely from all other 

 species of Senecio observed, and is evidently a rare type 

 amongst the Composite. The first three leaves are cordate, 

 repandly dentate, and also constitute an exception in the 

 Order. The cotyledons of Moscharia rosea (fig. 486) are 

 oblate, emarginate and truncate at the base greatly resembling 

 those of Cuphea silenoides, a species of Loasa, or a Labiate. 

 The two first leaves are sinuately pinnatifid. The form 

 of the cotyledons is already well marked in the seed, but 

 they widen considerably and change their form after ger- 

 mination. 



The second division including the elongated or large 

 cotyledons is the largest, and apparently contains the more 

 typical forms occurring in the Order. The species may be 

 grouped into those having linear, narrowly spathulate, 

 broadly spathulate, obovate, ovate and lanceolate cotyledons. 

 There is, however, every intermediate gradation between 

 these types, so that the one merges insensibly into the 



