64 



I 



Bracts linear, reflexed. Inflorescense viscid. 



A. Green tips longer than the lower portion 



I. Plants 2 dm. or more high. 



M. aspera Greene 



M. varians Greene 



M. sessiliflora (Nutt.) Greene 



(Dieteria sessiliflora Nutt.) 



M. rubricaulis Rydb. 



2. Plants low, I dm. or less high. 

 M. Patterson ii (Gray) Greene 

 M. coloradensis (Gray) nom. nov. 

 (Eriocarpum coloradensis (Gray) Greene) 

 (Xylorrhiza coloradensis (Gray) Rydb.) 



B. Green tips not longer than the lower portion 



M. spectabilis Greene 

 M. Selbyi Rydb. 

 M. viscosula Rydb. 



II 



Bracts shorter; not reflexed. 



1. Plants canescent. 



M. canescens (Pursh) Gray 

 M. superba A. Nelson 



2. Plants less canescent. 



M. pulverulenta (Nutt.) Greene 

 M. divaricata (Nutt.) Greene 

 M. subalpina Greene 

 M. ramosa A. Nelson 

 M. glabella Greene 



I 



M. aspera and M. varians Greene are very much alike. M. 

 aspera is more hirsute on the stem; and it is the older described 

 species. They do not differ in size. 



M. sessiliflora (Nutt.) Greene and M. rubricaulis Rydb. are 

 less glandular than the two preceding species; and there is 

 little to distinguish one from the other. 



Then I have listed two species which are quite unlike other 



