1882.] 



735 



cum had been divided by modem h the lines of 



distinction were Somewhat artificial. We had two genera, Phora- 

 dendron and Arceuthobium. Among the leading distinctions 

 might be mentioned that the European branch of the family Vis- 

 cum, as now restricted, had the anther open by three pores or slits, 

 our Phoradendron by two, while the Arceuthobium had but one. 

 There were other slight differences in pollen grains, cotyledons 

 of the fruits. The European mistletoe is usually 



foi 



ind on decidiu 



ms tree 



a only, a 





ice being recorded where 



it ] 



lad been fount 



i on the Scotch 





Germany, and it: 



5 Amer- 





n representati' 



/c, Pkoradcudro 





ecus Xuttall, seen 



aed also 





ifined to decid 





-ees and shrubs. 3 



Tins extends across the 



coi 



form being' 



found on 



the Pacific coast, still cor 



.fined to 



deciduous plants 



; • win 



le anoth« 



er gem. 



is, Arceuthobium 



, seems 



wh 



oily confined 



to the t 









.villi the 



de< 



:iduous ones. 



The n 



ame Arc 



:euthob: 



ium is suggestive 



! Of this 



fuc 



t, it being deri 



ved U-<> 





reek w. 



Drds signifying " 1. 





th« 



i juniper," Ph 



oraden. 



dron, on 



the otfc 



ler hand, meaning 



\ sim P!y 







xiling ! 





s." Arceuthobium, howt 





not live wholly c 



n i Lin j j 



,01-S. Ill 



the he 



jrbarium of the a 



cademy 







■ f. /.,>,-. 



•identale 









— 1 



:hese Nevada ; 



■^pe.-im. 



ms were 



on Piw 



)s pondcrosa TI; 



ic speci- 



me 



:ns of Pkoradc 





""'/>' ri '" 



<m wen 





hoccdrus 



Nevada. Among the differences noted by Engelmann in the 

 Botany of California between Phoradendron and Arceuthobium, 

 was that while the former flowered in February and March, and 

 matured its fruit ' next winter,' the fruit of the Californian species 

 opened in the summer, and did not mature ' till the second au- 

 tumn.' The European mistletoe was stated by Bentham to open 

 in spring, and perhaps this was so; it was formerly supposed to 

 be the case with the American w, but Mr. 



Wm. Canby had shown to the academy recently, that in Dela- 

 ware the flowers opened in the fall, and the fruit matured in the 

 autumn of the following year, or just one year afterward. The 

 tWsandl ttthesam. time together. If 



tins were general with Phoradendron, it still lessen. .d the distinc- 

 tions between the -enera. Usuallv Phoradendron bore leaves, 

 while Arceuthobium was leafless— 'but the Liboccdrus parasite 

 was a. destitute of leaves as an \rc it i .. ium, n 1 



