FLORA OF WASHINGTON AND VICINITY. 



51 



the Genera Plantarum. In the arrangement of the orders, too, for the 

 Polypetakc. ]\Ir. Sereno Watson's Botanical Index has in all cases been 

 conformed to, as also not materially deviating from the order adopted 

 by Bentham and Hooker. In the genera there are numerons discrep- 

 ancies between the works last named, and in the majority of these cases 

 the American authorities have been followed. For example, Bentham 

 and Hooker have thrown Dentaria into Gardamine, Elodes into Hyperi- 

 cum, Anipelopsis into Vitis, and Pastinaca and Archemora into Peuceda- 

 num. The change of Spergularia to Lepigonum is adopted, as well as a 

 few alterations in orthograi)hy where the etymology seemed to demand 

 them, as Pyrus to Pirus and Zanthoxylum to Xanthoxylum. I have also 

 declined to follow Bentham and Hooker in the changes which they have 

 made in the terminations of many ordinal names. The termination 

 acew is doubtless quite arbitrary in many cases, and perhaps cannot be 

 defended on etymological grounds, but as a strictly ordinal ending it 

 has done good service in placing botanical nomenclature on a more 

 scientific footing. It is also true that the old system does not always 

 employ it, as in some of the largest orders, e. g. Gruciferw, LeguminosWj 

 Gompositw, Labiatw ; but whatever changes are made should rather be 

 in the direction of Diaking it universal than less general. Bentham 

 and Hooker do not adopt a universal termination, neither do they 

 abolish the i^revailing one, and they retain it in the majority of cases ; 

 but in certain cases, for which they doubtless have special reasons, they 

 substitute a different one, and one which is often far less euphonious. 

 The following are the orders represented in this catalogue in which the 

 termination acece is retained by American and altered by English 

 authorities : 



American. 



Berberidacese. 



Cistaceae. 



Violaceae. 



Polygalacese. 



Caryophyllacete. 



Portulacacese. 



Hypericaceee. 



Celastraceae. 



Vitacese. 



Saxifragacece. 



Hamamelacese. 



Lythracese. 



Onagracea:'. 



Passifloraceae. 



Euglish. 



Berberidese. 



Cistinese. 



Violarieae. 



Polygaleie. 



CaryophylleoB. 



Portulacete. 



Hypericinese. 



Celastrinese. 



Amjielideaj. 



SaxifragesB. 



Hamamelidese. 



Lythrariete. 



OnagrarieiB. 



Passiflorese. 



American. 



Cactacese. 



Valerianace*. 



Asclepiadaceae. 



Gentianacese. 



BorraginaceiB. 



Scrophulariaceae. 



Lentibulacese. 



Plantaginacese. 



Nyctaginacese. 



Lauracene. 



Juglandacese. 



Salicaceae. 



English. 



Cacteae. 



Valerianese. 



Asclepiadese. 



Gentianeae. 



Boragineae. 



Scrophularineae. 



Lentibularieae. 



Plantagineae. 



Nyctagineae. 



Laurineae. 



Juglandeae. 



Salicineae. 



CeratoiJhyllaceae. Ceratophylleae. 



