178 



lowing: Thelypteris, Polystichum, Notholcena, Marsilea, Erioph- 

 orum, Veratrum, Kochia, Norta, Hoffmanseggia, Diholcos, Phaca, 

 Hedysarum, Callirhoe, Pediocactus, Chamaepericlimenum, Oreoxis, 

 Phellopterus, Cymopterus, Navarretia, Asperugo, Myzorrhiza, 

 Cucurhita, Leucelene, Brauneria, Coreopsis, Pericome, Nah'alus. 

 Several of these, as the Kochia, Norta and Asperugo, are 

 introduced plants, foreign to the native flora. Norta altissima 

 (L.) Britton is a remarkable case. I first collected it in 

 Boulder in July, 1915; now it is everywhere, one of the most 

 abundant weeds. It is also to be seen in other parts of the west, 

 as along the Union Pacific Railroad. There is some confusion 

 about the Linnean name and Bonnier calls the plant Sisymbrium 

 pannonicum ]sicq. The British "London Catalogue" also uses 

 this name. But the singular thing is the contrast between its 

 behavior in this country and in Europe. It has been introduced 

 in the British Islands, but remains a rare straggler, not estab- 

 lished. Gaston Bonnier says that it is not found at any great 

 altitude in the mountains; in France it occurs here and there, 

 very rarely; in Belgium it is rare, and inconstant in the localities 

 where it occurs; it is very rare in Switzerland. Why, then, has 

 it taken our country by storm? Asperugo procumbens L. I col- 

 lected in Boulder, May 8, 1916; but it has not spread to any ex- 

 tent, so far as I have oberved. A very interesting escape is Colutea 

 arbor escens L. I recently saw it among a lot of wild flowers 

 gathered by Miss Constance Fenton in Sunshine caiion. On 

 making inquiry, I found that Mr. D. M. Andrews knew of more 

 than one place near Boulder where it grew without cultivation. 

 The Sunshine cafion locality was many years ago the abode of a 

 solitary individual, who introduced various trees. Without 

 attempting to review all the additions and changes in the list I 

 note a few which seem of more general interest, or of which I 

 have personal knowledge. 



Quercus utahensis (A. D.C.) Rydb. Boulder (G. W. Letterman, 

 1854) ; Sargent, Trees and Shrubs, vol. 2. (1913), p. 222. It is 

 safe to say that this species does not occur wild in Boulder 

 County; there was probably some error in labelling. We have 

 no native oaks. 



