94 ON SEEDLINGS 



Ultimate leaves biternate with the secondary segments tripar- 

 tite, varying greatly in size from ^-2 inches in diameter ; primary 

 divisions triangular ; secondary cuneate ; ultimate segments obovate 

 or cuneate, entire. 



In Isopyrum fumarioides the cotyledons are somewhat more 

 elongated. 



Delphinium Staphysagria, L. (fig. 134). 



Fruit of one to five follicles, each containing many seeds and 

 dehiscing along the ventral suture. 



Seeds obovoid, rather acutely trigonous, or variously ridged and 

 angled ; testa thick and corky, deeply reticulated, black externally ; 

 tegmen thin and membranous, pale brown ; chalaza apical and as 

 well as the raphe rather obscure ; micropyle and hilum basal. 



PIG. 184. Delphinium Staphysagria. A, seed x 13. B, longitudinal 

 section of seed : E, embryo ; P, endosperm. 



Endosperm copious in the mature seed, white with a small 

 sub transparent mass separating the cotyledons. 



Embryo straight, minute, embedded in the endosperm at the 

 base of the seed ; cotyledons ovate, obtuse, entire, sessile, diverg- 

 ing ; radicle short, obtuse. 



Seedling (fig. 135). 



Primary root tapering downwards with numerous fleshy lateral 

 rootlets, dark-coloured. 



Hypocotyl erect, terete, succulent, glabrous, colourless below 

 ground, pale green above, 3 cm. long, 3 mm. thick. 



Cotyledons ovate-oblong, obtuse, glabrous, fleshy ; upper surface 



