118 ON SEEDLINGS 



midrib strongly protruding on the lower surface with many nerves 

 radiating from its base, and given off alternately or suboppositely 

 throughout its length ; nerves ascending, forking, reticulate ; petiole 

 long, terete, glabrous, pale green, containing two large, central, 

 semi-cylindrical cavities surrounded by eight small ones. 



No. 1. Filiform, tapering to the tip and without a lamina, sub- 

 merged, about 1 cm. long. 



Nos. 2-4. Lanceolate-oblong, obtuse, rounded at the base, with 

 a distinct midrib, brownish-green, finely mottled with purple on 

 both surfaces, thin or membranous, submerged. 



Ultimate leaves oval or orbicular, floating, slightly peltate by 

 the union of their basal edges for about T4 cm. ; with slightly 

 diverging auricles, shallowly and acutely repand-dentate, with three 

 nerves converging and entering each tooth, deep green and lucid 

 above, paler beneath and marked with a few irregular discoloured 

 blotches. 



The germination of N. alba has been described by Tittmann, 

 ' Denkschrift. der K. Baier. Bot. Ges.' Bd. ii. 1822, p. 101. 



Nuphar lutea has also been described by Tittmann in the same 



SARRACENIACE.E. 



Benth. et Hook. Gen. PL i. 48. 



Fruit and Seed. The pistil is superior, syncarpous, with a 

 three- to five-celled ovary made up of as many carpels. The 

 placentation is axile, the numerous ovules are horizontal, ana- 

 tropous, and arranged in many series. The fruit is capsular. 

 The seeds are small, numerous, filled with a copious endosperm 

 surrounding a minute embryo near the hilum. The testa is 

 crustaceous, loosely reticulate, or bristly. 



The seeds of Sarracenia are short, oblong, nearly or quite 

 sessile, or with a finely reticulated testa, and a very stout raphe 

 forming a deep ridge running along the whole of one side. 

 The very minute embryo lies in the endosperm close to the 

 hilum, and the cotyledons equal the radicle in length. The 

 seeds of Darlingtonia californica l resemble long stalked club- 

 like processes, provided especially at the apex with barb-like 

 bristles. These are longest and strongest at the apical end. 



1 See the figure, Le Maout and Decaisne, System of Botany (English 

 translation), p. 213. 



