1()2 Rhodora [July 



Cob. Petala numerosa (quindecim saepe), calyce minora, genninis 

 lateri insidentia, aerie plusquam simplici 



************ 



Obs. Calyx & Corolla quoad numerum & figurant incerta .sunt, 

 hi lie 



X. lutea Calyce pentapkyUo, foliolis eubrotundia, Petalis minimi*. 

 X. alba Calyce tetraphyllo, fcliolis ovatis, corollam ri.v superantibus. 

 Nelumbo Pericarpium turbinatum, truncatum, etc., etc. 



In the description of the other genera in this work, Linnaeus usually 

 did not name any species. In the ease of Xymphaea, however, he 

 pointed out in his "Observations," as shown above, that three distinct 

 elements were included in it. 



The important differences between these three elements had so 

 impressed Linnaeus in the course of ten years, that he changed the 

 description of the genus in the sixth edition of Genera IMantarum 

 (17(i4) to read thus: (p. 204). 



Cal. Perianthium inferum, tetraphyllum, magnum, supra colora- 

 tum, persistens. 



Cor. Petala numerosa (quindecim saepe), genninis lateri insidentia, 

 serie plus quain simplici. 



************ 



N. lutea Calyce pentapkyUo: fcliolis subrotundis, Petalis minimis 



a rdiquis differt. 



Nelumbo pericarpium turbinatum, truncatum, etc., etc. 



It will be noted that the word peniapkyllum is omitted from the 

 description of the calyx, and calyce minora is omitted from the descrip- 

 tion of the corolla. Both of these omitted expressions apply to the 

 A r . lutea element of the former edition. The description as thus 

 amended applies strictly to the X. alba element. This is further 

 emphasized by the words Cor. germinis lateri insidentia, referring to 

 the insertion of the petals on the side of the ovary in the white 

 waterlily group. This character does not occur in the cow-lilies, or 

 in the lotus (Nelumbo). 



As in the former edition, there was usually no citation of species in 

 the sixth edition of Linnaeus's Genera Plantatum. Here, however, 

 iV. lutea and Nelumbo were named. A', lutea was said to "differ" 

 from the others by certain characters. The mention of the two 

 "aberrant" (Briquet, p. 578) elements, and the omission in this 

 edition of the name of the fully described waterlily element, shows 

 that the genus Xymphaea was at this time intended by Linnaeus to 



