162 REPORT OF AN EXPEDITION DOWN THE 



L. graveoiens, Torr. and Gr., Fl. 2, p. 234. Near Laguna; August. 



Jlplopappus spinulosus, D. O, Torr. and Gr., Fl. 2, p. 240. Mountain ridge 

 between Laguna and Acona. 



Jl. Nuttallii, Torr. and Gr. 1. c. Eriocarpwm grindeloides, Nutt. Trans. Amer. 

 Phil. Soc. 7, p. 321. On the Rio Zuni; September. 



This well-marked species has not hitherto been found since it was detected by 

 Mr. Nuttall in Oregon 



.4. (Pyrrocoma) racemosa, Torr. and Gray, Fl. 2, p. 244. Homopapjms race- 

 mosus. Nutt. i. c. On the Laguna; October. 



A stout plant, with the heads more than an inch in diameter, the rays incon- 

 spicuous, and the achenia glabrous. Hitherto this species has been found only 

 on the plains of the Wahlamet, in Oregon. 



Chrysopsis villosa, Nutt. Torr. and Gray, Fl. 2, p. 255. San Francisco moun- 

 tain, and on the Little Colorado; September. 



C. canescens, Torr. and Gr., 1. c. Rio Lagunn ; August. 



Baccharis brachyphylla, Gray, PL Wright. 2, p. 83, varr foliisminutis, obevato- 

 spatulatis, vel cuneatis integerrimis vel raro apice utrinque unidentatis, involucre 

 pleuriseriatis, squamis lanceolatis obtusiusculis glabris. Yampai creek; No- 

 vember. 



Shrubby, with numerous eject branches, which are covered with a resinous 

 aromatic varnish. Leaves mostly about one-third of an inch long, somewhat 

 appressed, rigid, obtuse; sometimes rather acute, mostly entire. Heads 3-4 lines 

 long, either solitary and terminating the several branches, or several together, 

 and nearly sessile. Involucre hemispherical-turbinate, the scales closely ap- 

 pressed, in four or five series. Achenia glabrous Pappus pale fulvous, about 

 three times the length of the achenia. Accompanying the specimens, (which 

 were female only,) and adhering to one of them was a linear-lanceolate glabrous 

 ontire leaf, nearly three inches in length, which seems to have belonged to the 

 lower part of the plant. A species of Baccharis nearly allied to this, but appa- 

 rently distinct, was collected by Major Emory on the Gila, in 184C, and is one 

 of those alluded to in the botanical appendix to his report. It differs from the 

 plant here described, in its smaller and narrower leaves, larger heads, broader 

 and more obtuse involucral scales, with longer and finer pappus. It is very 

 abundant in the valley of the Gila, forming dense •' bunches." 



Tessaria bor calls, Torr. and Gray, in Emory's rep., p. 143, Gray; PI. Fendl., 

 p. 75: PI. Wright. 1, p. 102. On the Colorado: abundant on the sand-banks. 

 The long straight hranches are used for arrows by the Indians, whence it is 

 railed " arrow-wood"' by travellers. November. 



msia psilctachya, D. C, Prodr. 5, p. 526; Gray, PI. Wright. 1,;). 104. 

 (adult.) Bill Williams's river: October. 



Franseria Hookeriania, Nutt.; Torr. and Gray, Fl. 2, p. 294. Near the puebla 

 of Zuni; September. The spines of the involucre are broadly lanceolate in 

 many of the heac's. 



