76 



riTTONIA. 



shall have been taken note of. In respect to subterranean 

 clmracteristics our plant of the Avesteni mountains differs 

 entirely from P. cKruleum of the Old World and of our 

 gardens, which has a taproot surmounted by a stout, short, 

 simple or branching very leafy crown, tiiis altogether above 

 ground. It is possible that our P. occ'idenfale may be speci- 

 fically identified with some one of the subartic species which 

 were published long since ; yet it answers to the description 

 of none of them. Even P. acutijtorum, to which it seems 

 to come nearest, must, from the various accounts of it, be 

 quite a ditferent affair. 



In the genus Troximon as presented in the Synoptical 

 Flora a number of new species are defined, while at the same 

 time there are several instances of the fusion of two, and even 

 three, old ones in one. The case of this sort which is most 

 glaring m the eyes of a botanist familiar with the plants 

 on their native plains and mountains, is that of the " T. 

 aurnniiacnm " of that w.n-k. The disentanglement may best 

 begin with a draft of the characters of the true 



Teoximon aurantiacum, Hook. Fl. Bor.-Am. i. 300. t. 104. 

 Nearly glabrous, deep green and not in the least glaucous : 

 leaves oblanceolate, obtuse, entire, narrowed to a slender 

 petiole : head small ; ligules orange-color : achene taperin^ 

 gradually to a short stout beak (not to a filiform stipe of the 

 pappus), the pappus sessile. 



This is frequent in dry open pine woods of the Colorado 

 itockj Mountains at 8000 or 9000 feet, but was first obtained 

 from a more northerly locality. The figure of Hooker is 

 excellent, except that the involucre is wrongly represented as 



cr 



having bracts somewhat united. They are, of course, distinct 

 Dr. Gray can not have had fruit of the following, or he 

 would not have reached such a conclusion as that it should 

 be a mere variety of T. aurantkwum. 



TiiOxiMON ruEPUKEUM (Gray). Macrorhyndius pnrpn- 

 Tens, Gray, Tl. Tendl. lU (18i9) : Troximon aurantlaciun, 



