NYMPHMAGEM. 



85 



in a gummy substance, that exudes into the cells. Each seed is sur- 

 rounded by a membranous sacciform aril, springing from around the 

 insertion of the funicle, 1 and open below. Within the coats is a 

 double albumen and a small embryo, resembling the same organs in 



Xgmphaa alba. 



\ 



Nwphar. Some twenty species of Nymphaa are known, 2 inhabiting 

 all the tropics and the various parts of the Northern Hemisphere. 

 The vegetative organs and inflorescence are the same as in Nwphar. 

 Their flowers are large and handsome, white, pink, red, or blue, and 

 the fruits ripen under water. 



In Barclaya? the floral receptacle forms a nearly cylindrical 

 tube, lodging the gynseceum below, while the upper part gives 

 insertion to the stamens on the inside, and by its mouth to an 

 indefinite number of perianth leaves. Most authors consider this 

 superior perianth as a polypetalous imbricated corolla, and regard 

 the calyx as represented by five leaves inserted right at the base of 

 the receptacular tube. 4 The stamens are numerous, spirally disposed ; 



1 Mieb., Nowo, Rech. d'Organ. Veg., t. 6, fig. 

 15, 16.— Pl., Dtv. et Car. des Ar., 17. Hence 

 to form the pulp inside the fruit there is 

 something besides the gummy mucilage also 

 found in Nwphar, and mentioned by Caetiel (in 

 Ann. Sc. Nat., ser. 4, xii. 77). 



2 Divided into 4 sections : 1. Lot ox ; 2. Cya- 

 nea ; 3. Hydrocallis ; 4. Castalia (Pl., loc. tit., 

 32). — Deless., Icon. Sel., ii. t. 5. — Case., in 

 Annal. Mm. Lugd.-Batav., ii. 243, t. 7. — Walp., 

 Ann., iv. 153 ; vii. 76. 



3 Wall., in Trans. Linn. Soc, xv, 442, t. 

 18. — Endl., Gen., n. 5022. — Hook., Icon., t. 

 809, 810; in Ann. Sc. Nat., se'r. 3, xvii. 301, t. 

 21. — Hook, f., in Trans. Linn. Soc, xxiii. t. 

 21.— B. H., Gen., 47, n. 5.— Waip., Ann., iv. 

 167. 



4 W. Hookee formerly considered these an 

 involucre, an interpretation which has been con- 

 tested by other authors (Pl., in Ann. Sc. Nat., 

 ser. 3, xix. 57). 



