OF ARTS AND SCIENCES. 83 



Mountain region has been particularly diflicult. The result of a 

 recent study of it, in the form of the following synopsis of the 

 species, may assist our botanists. 



« Involucri bracteoe insigniter sensim acuminatae : capitulum amplura. 



■»- Annufe vel biennes, caulescentes, pube hirsutula decidua demum 

 glabratfe : bracteae involucri lato- seu ovato-lanceolato3, margini- 

 bus plerumque latissime albido-scariosis : ligulas loete violaceae vel 

 caeruleje. 



++ Pappus abbreviatus, persistens, corneus, ex aristis 2 subulatis et 

 squamellis demum rigidis siepius coroniformi-concretis : achenium 

 lato-obovatum glabratum : involucrum fere T. grandiJlorcB. 



T. EXIMIA, Gray, PL Fendl. 70. — Northern New Mexico and 

 Colorado, Fendler, Bigelow, &c. 



++ ++ Pappus saltern disci plurisetosus generis : achenium angusto- 



obovatum. 



T. GRANDIFLORA, Nutt. Mox decumbcnti-patens, angustifolia ; 

 involucri bracteis acumine cuspidato ; pilis achenii sub lente glochidiato- 

 capitellatis : pappus radii e squamellis brevibus. — Wyoming and Ne- 

 braska to New Mexico. 



T. Parrti, Eaton in Am. Nat. viii. 212. Erectus, nanus, simplex ; 

 foliis spathulatis : involucri latissimi bracteis angustioribus tenuioribus 

 minus attenuatis, extimis parum acuminatis ; acheniis canescenti-pu- 

 bescentibus, pilis apice acutis vel 1-2-dentatis ; pappo radii ut disci 

 plurisetoso. — Rocky Mountains of Wyoming and E. Idaho, Hayden, 

 Parry. 



Var. ALPINA. Forma depressa, cinereo-pubescens, parvifolia ; caule 

 florifero abbreviato vel fere nullo ; bracteis minus acuminatis ; ligulis 

 " roseo-purpureis." — High divide between Stinking Water and the 

 Yellowstone (confounded with T. spathulata), Parry. 



•«- -I— Perennis e caudice stoloniformi, depressa, pilis longis arach- 

 noideis lanosissima ; capitulo intra folia rosulata spathulato-obovata 

 sessili : bracteae involucri lineares, moUes : pappus disci et radii 

 plurisetosus, tenuis. 



T. CONDENSATA, Parry in Am. Nat. viii. 213 (char, ex D. C. 

 Eaton). — Wyoming, on an alpine peak of the Owl Creek range, T. 

 D. Putnam. 



• * Involucri bracteas parum vel hand acuminatae : capitulum minus 



vel angustius. 



