NT SE” So he ann hres BAe tS 
CS a Dee > ee », ye 
2 Muhleubergia, Volume a 4 
Botany of the Mexican Boundary 86. A/. 30. 1859, there is a 
good description of the genus with a plate, and the original de- 
scription of D. canescens. It was secured by Emory in the 
sandy deserts of the Gila and of the Colorado in 1846. 
Coville, in the Botany of the Death Valley expedition, 1893, 
speaks of it as follows: ‘The vegetation of dry heaps of drift- 
ing sand in the desert is very scanty, for but few plants can live 
in such places. One of them is the present species and even it” 
was found only in three places, along the Mohave River at Dag- 
gett, near Saratoga Springs (No. 247) and in Owen’s Valley at. 
the ooh of the first canyon on the road from Keeler to Dar- 
win.’ 
The second species in the genus, D. Brandegez, seems to 
be a very rare plant. It was collected by T. S. Brandegee in 
southwestern Colorado in Hayden’s exploration, 1875, and de- 
scribed by Gray in Proc. Am. Acad. 11: 76. 1876. Rydberg, 
in his Flora of Colorado, 328, mentions its occurrence from Col- 
orado and Utah to Arizona—San Juan river—between McElmo 
and Recapture creeks. It is characterized by having only one 
achene which exceeds its subtending bract, and has merely 
blunt, rigid teeth in place of a wing. . 
Our plant was found in drifting sand with no other vegeta- 
tion in the immediate vicinity. Its very striking odor and bit- 
ter taste, somewhat. resembling hops, does not seem to be men- 
tioned by any of the previous collectors or describers of the other 
species. There were only two plants seen. One half of a sin- 
gle plant was sufficient to make twenty-five full sheets, so nu- 
merous were.the branches. The stem was somewhat pithy, 
reminding one of the large annual saltbushes. 
/Dicoria Clarkae n. sp. 
A stout, herbaceous annual or biennial with few leaves and 
numerous. spreading branches thickly covered with the large 
yellowish-white, accrescent, hooded bracts much exceeding the 
achenes. 
