APPENDIX G. — BOTANY. 275 



Achillea millefolium, Linn. ; Torr. and Gr., Fl. 2, p. 409. With the 

 preceding. It is the woolly form that almost exclusively occurs west of the 

 Mississippi. 



Zinnia grandiflora, Nutt. in Trans. Amer. Phil. Soc. (n. ser.) 7, p. 348 ; 

 Torr. and Gr., Fl. 2, p. 298 ; Torr. in Emory's Rep., t. 4, Gray, PI. Fendl., 

 p. 81. Main Fork of Red River ; fl. July 2. 



Riddellia tagetina, Nutt. 1. c, p. 371 ; Torr. and Gr., Fl. 2, p. 362; 

 Torr. in Emory's Rep., t. 5 ; Gray, PI. Fendl. p. 93. Main Fork of Red 

 River ; June 25 — July 8. The pappus is more hyaline and acute than in speci- 

 mens from other localities in my herbarium. It is also slightly lacerate 

 at the tip, showing something of a transition to R. arachnoidea. The leaves, 

 too, are more woolly and broader than in the more common form of the 

 plant. 



Rudbeckia hirta, Linn. ; Torr. and Gr., Fl. 2, p. 307. Witchita 

 Mountains ; fl. June 1. Is R. bicolor distinct from this species? Dr. Gray re- 

 marks, (Plant. Lindh. 2. p. 227,) that in cultivation, the purple brown of the 

 rays is commonly obsolete or wanting in all the later heads. 



Echinacea angustifolia, DC. Prodr. 5, p. 554 ; Torr. and Gr., Fl. 2, p. 

 306. Witchita Mountains ; June 1. 



Lepachys columnaris, Torr. and Gr., Fl. 2, p. 315. Rudbeckia columnaris, 

 Pursh, Fl. 2, p. 575. Common on all the tributaries of the Red River ; 

 June. 



Helianthcs petiolaris, Nutt. in Jour. Acad. Philad. 2, p. 115 ; Sweet 

 Brit. Fl. Gard. (n. ser.) t. 75. With the preceding. 



Gaillardia pulchella, Foug. ; DC. Prodr. 5, p. 652 ; Torr. and Gr., 

 Fl. 2, p. 366. Common on the upper tributaries of the Red River ; May — 

 June. 



Palafoxia callosa, Torr. and Gr., Fl. 2, p. 369. Stevia callosa, Nutt. in 

 Jour. Acad. Philad. 2, p. 121 ; Bart. Fl. Amer. Sept., t. 46. /S/oUis latiortbus . 

 Tributaries of the Washita ; June. 



Hymenopappus cortmbosus, Torr. and Gr., Fl. 2, p. 372. H. Engdmanni- 

 anus, Kunth. 



