SCROriIULARINE.E 305 



(fig. 556) are very similar. The first two pairs of leaves are 

 cordate and serrate, succeeded by three pairs which are larger, 

 more acuminate, and very unequally serrate. An unnamed 

 species of Pedicularis differs in having smaller and more 

 obtuse cotyledons. The first pair of leaves are ovate-oblong, 

 shallowly pinnatifid with rounded serrulate lobes. 



The cotyledons of Calceolaria chelidonioides (fig. 551) are 

 very small, suborbicular and entire. The first two pairs of 

 leaves are broadly ovate and serrate ; the third pair are tri- 

 angular and pinnatifid. Linaria Cymbalaria (fig. 555) differs 

 very much from all other species of the genus noticed. The 

 cotyledons are small, rotund, entire, mucronate, and unequal 

 in size. The hypocotyl remains very short and does not 

 develop adventitious buds as in most other species. Branches 

 are, however, given off from the axils of the cotyledons, and 

 the stems are procumbent. The first pair of leaves are 

 cordate-reniform and shallowly crenate ; but the second pair 

 are rather more acutely toothed. 



A large proportion of seedlings have suborbicular and ernar- 

 ginate cotyledons. Those of Collinsia bicolor (fig. 559) are 

 shallowly tridentate, and three- to five-nerved, but the venation 

 is descernible only when the cotyledons begin to decay or dry 

 up. The first three pairs of leaves are ovate, serrate, and 

 subcordate at the base. C. parviflora and C. multicolor agree 

 pretty closely with C. bicolor, except that the cotyledons are 

 rather more decidedly emarginate. The first pair of leaves 

 of C. parviflora are incipiently trifid ; those of C. multicolor 

 are crenate and emarginate. The cotyledons of Paulownia 

 imperialis (fig. 558) conform to this type, but are very small. 

 The first pair of leaves are roundly ovate and distantly dentate, 

 succeeded by three pairs that are successively much larger, 

 more decidedly cordate, and more deeply dentate. Alonsoa 

 incissefolia has the cotyledons and hypocotyl pilose, and the 

 first pair of leaves are incise-serrate and relatively broader 

 than in the adult. Veronica Waldsteiniana is notable for its 

 dwarfed hypocotyl and the breadth of the first pair of leaves. 

 An unnamed species of Veronica closely allied to V. hederaefolia 

 is notable in the Order for the size of its cotyledons which are 

 orbicular, trinerved throughout their length, with the lateral 



II. X 



