110 



EEYTHEA. 



the rays had been of any other color than yellow, the plant 

 would have been a Machceranthera. But that genus has 

 not the short pappus of unequal awn-like bristles found in 

 this species; neither hag it the densely silky achenes.— 



Mexico 



9. E. Coloradense. Aster Color adoensis. Gray, Proc. 

 Am. Acad. xi. 76 (1875). This was also referred by Dr. 



Machoe 



It is much 



more like a Townsendia in habit; but it has the achenes and 

 pappus of the present genus, as also the spinulose-toothed 

 foliage.— South Park, and elsewhere among the mountains of 

 southern Colorado. 



Undoubtedly through the last three species of the fore- 

 going enumeration, the contact is somewhat close between 

 Eriocarpam and Machceranthera, though the technical 

 character is good, so that by it species may be referred 

 without hesitation to the one or the other, without reference 



to color of rays. 



There remain a few species of Gray's "Aplopajjpus '' 

 which perhaps ought to be referred to Eriocarpum— 

 species of which I have access to no specimens, and upon 

 which I can not at present pass an opinion. 



One more genus, much like Eriocarpum as to achenes and 



'/ 



ty 



Botany; that is Tsocoma. Differing from all the ''Bigelovias'' 

 of Asa Gray in the three points of an inflated and closed 

 corolla, silky-canescent achenes, and short awn-like unequal 

 pappus-bristles, it forms a group so natural that in the 

 Synoptical Flora it is retained in its integrity as a subgenus 

 Aplodiscus of ''Bigehvia:'' but the '' B. veneta" of that 

 volume IS a bad mixture of several distinct species. 



1. I. VERNONioiDES, Nutt. Trans. Am. Phil. Soc. vii 320 

 (1840). Pyrrocoma Menziesii, Hook. & Arn. Bot Beech. 

 351 (1841). Aplopappns Menziesii, Torr. & Gray, Fl. ii. 

 242(1842). Linosyris deniata, -KqW. Proc. Calif. Acad. ii. 



