220 LEAFLETS. 



I have been unable to ascertain that any authority upon genera 

 or generic nomenclature, whether of the nineteenth century or 

 the twentieth, has hitherto discoTered this. Every one of them 

 seems to have been misled by the name Psbdeka, Neck. This 

 is really Pseudohedera with certain syllables eliminated, partly 

 for the sake of brevity, but more for the purpose of keeping it 

 from falling under the ban of that excellent article of Linnaeus' 

 Code which prohibits the use of generic names formed by pre- 

 fixing Pseudo to another name. The name itself, therefore, must 

 have beguiled the superficial into guessing that Psedeea is some 

 segregate of Hedera : and this guess has found expression in 

 certain well known bibliographies. But the authors can hardly 

 be supposed to have looked beyond the mere name itself. The 

 character ascribed to Psedeea by Necker is in accord with that 

 of Planchon's Parthenocissus in all essentials. But what places 

 my identification of Psedeea with Parthenocissus beyond all 

 cavil is the circumstance of Necker's having stated one of Lin- 

 naeus' Hedera species to be its type; for of that genus the species, 

 with Linnaeus, are but two. 



Only the American species of Psedeea at present concern me. 



P. QUINQUEFOLIA. Hedera quinquefolia, Cornut (1635), Linn. 

 (1753), Mill. (1768). Vitis quinquefolia, Tourn. (1700), Lam. 

 (1793), Moench (1794). 



P. HIESUTA. Ampelopsis hirsuta, Roem. and Schultes (1819). 



P. viTACEA. Parthenocissus vitacea, Hitchc. (1894). 



P. Texaita. Parthenocissus Texana, Eehder (1905). 



P. LACiKiATA. Ampelopsis quinquefolia var. laciniata. Gray in 

 Planchon (1887.) 



