OP ARTS AND SCIENCES. 57 



lower successively shorter and more appressed, the corollas crimson- 

 purple. It was collected near Camp Apache, in Arizona, by Rothrock 

 in Wheeler's Survey, and was referred by him to C undulatus. It 

 is his no. 293. 



In the section with closely appressed-irabricated involucral bracts, 

 only the prickle, if any, spreading, the outer successively shorter, and 

 most of them having a viscid-glandular ridge, line, or spot on the back 

 of the tip, some changes have been made, especially in the difficult 

 groups to which C. undulatus belongs. 



C. GuAHAMi, Cirsium Grahami, Gray, PI. "Wright, ii. 102, Hook. 

 Bot. Mag. t. 2885, is distinguished anew. The scabrous-ciliolate edges 

 of the principal involucral bracts give a good diagnostic character, and 

 its habit is well marked. 



C. OCHROCENTRUS, Cirsium ochrocentrum, Gray, Pi. Fendl. 110, is 

 again distinguished from C. undulatus, taking with it some specimens 

 which had been referred to var. megacephalus of the latter. Its invo- 

 luci-al bracts are comparatively larger, flatter, broader at base, and 

 only now and then develop a narrow viscid line or ridge on the back 

 of the tip of some of them, and the prickle is usually longer. 



C. ALTissiMUS, Willd. To this we liave to append two varieties, — 



Var. FiLiPENDULUS, Cirsium fiUpendulum, Engelm., of Texas, which 

 had been confounded with C. Virffinianus, and 



Var. DISCOLOR, C. discolor, Muhl., differing only in the cutting of 

 the leaves from C altissimus, to which it must be united, although 

 intermediate specimens seem to be rare. 



Mutisiacece. 



GoCHNATiA HTPOLEUCA. Moquinia hypoleuca, DC. Prodr, vii. 

 23. This shrub, which occurs along the borders of Southwestern 

 Texas, certainly has more or less polliniferous fertile flowers ; and the 

 same is true in some specimens of the typical species of the genus, M. 

 pohjmorpha. The style-branches of the latter, if not so exactly trun- 

 cate as is figured by Heyland in DC. Mem. Comp. t. 13, are so nearly 

 so as to offer no obstacle to the reception of the following species into 

 the genus : — 



GocHNATiA GLOMERiFLORA. Forte hcrbacea, tantum puberula; 

 foliis ovalibus, chartaceo-coriaceis concoloribus acuminatis modo Pere- 

 zice rigide dentatis et reticulatis (4-pollicaribus) : capitulis arete glome- 

 ratis ; glomeribus in axillis foliorum sessilibus summisve secus apicem 

 nudum rami concatenatis ; involucro 4-5-floro, bracteis lanceolato- 

 subulatis 3-5-seriatis ; floribus pallidis ; styli ramis apice truucatis. — 



