SCROPIIULARINE^E 307 



The cotyledons of Linaria become greatly elongated and 

 are incipiently trifid. Those of L. tristis are cuneate-linear. 

 The cotyledons of L. genistifolia are lanceolate or ovate- 

 lanceolate and slightly constricted about the middle. The 

 cotyledons of L. striata are elliptic and 3'5-4'25 mm. wide 

 in the middle ; and the primary leaves are in pairs. Those 

 of L. bipartita (fig. 553) are linear and entire. The first five 

 pairs of lea.ves are lanceolate and trinerved at the base. 



A remarkable peculiarity of all the species of Linaria noticed 

 except L. Cymbalaria is that the hypocotyl develops a group 

 of adventitious buds from a point near the surface of the 

 giound. The primary stem after producing a few pairs of 

 leaves ceases to elongate. The adventitious buds or a number 

 of them grow strongly and soon overtop the primary axis which 

 they supersede, and constitute the flowering stems. Both 

 annuals and perennials, with the exception above mentioned, 

 behave in this way. The cotyledons often bear a close re- 

 semblance to the leaves of the primary axis. The tip above 

 the constriction constitutes the original and true lamina of 

 the cotyledon ; all below it is developed as a result of inter- 

 calary growth subsequent to germination. 



Calceolaria chelidonioides, H. B. K. (fig. 551). 



Primary root short, tapering, succulent and soft, with a few 

 lateral fibres, annual. 



Hypocotyl succulent, glandular - pubescent, 

 merging into the root. 



Cotyledons small, soon withering, pale green, 

 petiolate ; petiole 1'5 mm. long ; lamina small, 

 rotund, 2 mm. in diameter. 



Stem erect, soft, succulent, green or purplish 

 by exposure, sparsely glandular-pubescent ; 1st 

 internode 2 cm. long ; 2nd 3 mm. ; 3rd 5 mm. 



Leaves simple, cauline, opposite, exstipulate, 

 petiolate, glandular-pubescent or hairy, deep green 

 above, paler beneath ; petioles convex, and gla- FlG 551 



brous on the under side, channelled above and Calceolaria 

 glandular-hairy. ^1Sf" 



First pair very small, ovate, subacute, serrulate. 



Second pair ovate, subacute, serrate, much larger than the first 

 pair. 



x 2 



