480 ON SEEDLINGS 



Both show a very gradual evolution of the leaves, but par- 

 ticularly E. phoenicolasius where the first is ovate, the 

 second and third reniform, and the fourth to the seventh 

 inclusive are oblong-cordate, and more or less lobed. 



The Potentilleae have mostly small seeds and small cotyle- 

 dons, but some striking variations in this respect may be found 

 amongst the species of Geum as represented by G. Free- 

 montii (fig. 313) and G. coccineurn, the latter of which 

 has broadly oblong trinerved cotyledons. G. urbanum is 

 intermediate between these extremes. All have pinnate leaves 

 ultimately, while the first one is reniform or triangular with 

 many intermediate forms in the seedling stage. The fourth 

 leaf of G. coccineum is cordate, and the fifth lyrate-pinnatifid. 

 The cotyledons of all the species of Potentilla observed are 

 small and vary from oval to oblong-oval and suborbicular. 

 As far as the leaves are concerned two very distinct types may 

 be noticed, namely, those with pinnate leaves such as Potentilla 

 anserina (fig. 316), P. fulgens (fig. 315), and P. bifurca (fig. 

 317), and those with digitate leaves represented by P. 

 argyrophylla and P. reptans (fig. 314). The species of Rosa 

 conform to the general type in having oval or oblong cotyle- 

 dons. R. berberidifolia, as already mentioned, is an extreme 

 type. The cotyledons are generally moderately large, and in 

 E. moschata this is particularly the case; they are also 

 minutely emarginate, trinerved and ciliate. All the leaves 

 of R. berberidifolia are cuneate, simple and doubly serrate. 

 The first three of R. moschata are trifoliolate. More typical 

 examples are met with in E. rugosa and E. macrocarpa. 

 The cotyledons are oval, the first leaf cuneate and simple, 

 the second trilobed or trifoliolate, while a number of succeeding 

 ones are trifoliolate. 



The members of the tribe Pomeae have moderately large 

 cotyledons varying from oblong-oval to obovate in conformity 

 to the seeds containing them. They are generally very shortly 

 petiolate, sometimes subsessile, and more or less evidently 

 trinerved though rather opaque. Pyrus Aucuparia (fig. 323) 

 shows the trinerved character. The first leaf is ovate and 

 trifid ; the second tripartite, and succeeding ones pinnate. 

 The cotyledons of Cratsegus Oxyacantha (fig. 324) and C. 



