NOTES ON OUR LOCAL PLNATS 4I 



not enter into the consideration of the problem whatever. It is 

 not primarily a question with us whence Philipsson gained his 

 knowledge of these genera, which in the thesis above noted he 

 described as new. That was a matter of interest almost alone 

 to Philipsson. What we are interested in is whence biological 

 science first learned of the genera described. And in answer to 

 our inquiries we find that Philipsson is to be considered as the 

 authority for these molluscan names. The genera, then, and their 

 included species of this thesis, should be cited, Placenta, Chaena, 

 Melina, Perna, Unio, all of Philipsson, 1788. 



The Consolidated Schools 



of Brandon, Iowa. 

 Independence, Iowa. 



Notes on Our Local Plants. 



BY J. A. NIKUWLAND. 



Order lo. LEMNALES. 



Family 20. LEMNADEAE S. F. Gray, Nat. Arr. 

 Br. PI. II, p. 729, (1821). 



Lenticulaceae Dumortier, Comment. Bot. p. 67 (1823). 

 Lemnaceae Dumortier Flor. Belg. p. 165, (1827), also An. 

 Fam. PI. p. 61, (1829). 



BRUNIERA Franch. in Billotia 25 (1864) Woljia Horkel 

 ex Bartling, Ord. Nat. PI. p. 76, (1830.)' Wolffia Horkel ex Schlei- 

 den, Linnaea, XIII, p. 389, (1839). Wolffia Kunth, Enum. PI. 

 Ill, 4, (1841), not Woljia Dennst. Schluess. Hort. Malab. 38, 

 (1818), nor Wolfia Sprengel, Syst. I, 808, (1825), nor Wulffia 

 Necker, Elem. I, 35, (1790). 



' Since my last notice on the synonymy of these plants, I have found, 

 that the first publication of the name Wolfia as applied to the Lemnaceous 

 plants was spelled with one f. In this form which has priority over the 

 name spelled with two f's, it is therefore an unequivocal synonym to the 

 pre-existing names also spelled in the same manner with one f. There can 

 then be no excuse for retaining the name in our floras. 



