164 ON SEEDLINGS 



Although very small they are mostly if not always slightly 

 emarginate and shortly petiolate, not only in this species but 

 the -whole group. The first two leaves of L. Erimis are ovate 

 or elliptic with slender petioles. The cotyledons of Lobelia 

 tenuior are much larger, ovate, and emarginate with longer 

 petioles. The first two leaves are rhomboid, while the third is 

 shallowly five-lobed. 



Another type is furnished by Campanula bononiensis (fig. 

 493). The cotyledons resemble those of Lobelia tenuior. 

 The first leaf is spathulate-ovate, the second oval, and the 

 third and fourth obovate. The cotyledons of C. thyrsoides are 

 smaller, and the first leaf is also relatively small, ovate, and 

 obscurely dentate. Succeeding leaves vary through ovate, oval, 

 obovate and elliptic forms, at the same time greatly increasing 

 in size, and much exceeding in that respect any of the above 

 mentioned. 



Suborbicular and emarginate cotyledons are met with in 

 Campanula gummifera. They are also more markedly reticu- 

 late than is generally the case. The first leaf is cordate, cre- 

 nate, and hairy. The cotyledons of Specularia castellana are 

 emarginate and rather broader than long. Three or four of 

 the primary leaves are suborbicular, shallowly crenate and 

 hairy. The seedling of Colensoa physaloides (fig. 491) recalls 

 that of Campanula thyrsoides to some extent in its small entire 

 cotyledons and the graduation of the leaves from the first 

 small one to the fifth, and onwards. The internodes are, 

 however, much more elongated. A slightly different type 

 occurs in Specularia biflora which has comparatively large 

 oblong-obovate emarginate cotyledons tapering into a long 

 petiole. 



The first four leaves are obovate- spathulate, and obscurely 

 crenate, with glands in the notches, not on the crenatures. 



Downingia pulchella, Torr. (fig. 490). 



Primary root slender, colourless, soon giving rise to a fascicle of 

 strong colourless roots from its base. 



Hijpocotyl herbaceous, strong, erect, terete, glabrous, l'S-2'2 cm. 

 long and 1 mm. thick, or more. 



Cotyledons subulate-linear, slender, acute, deep green and 



