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4 ee Muhlenbergia, Volume 4 ; : vest 
lar pubescent bracts 13 mm. Jong and 10mm. wide; twelve veins 
originate at the base and anastomose throughout each bract; 
margin erose, each achene subtended by a bract which is about 
twice its length: achene oblanceolate, brown, 6mm. long and 
21mm. wide, no wing, the toothed margin less ‘than 1mm. wide, 
teeth variable, truncate or pointed, usually divided to the body 
of the achene, ventral surface flat or slightly concave, dorsal sur- 
face convex, both surfaces more or less pubescent and carinate 
and covered with glandular dots, no vestige of an anterior or 
posterior wing: style 5mm. long, style branches 3mm. long: " 
pappus none unless a few bristles at the base of the style should 
represent it: corolla of pistillate flowers none; staminate flowers 
about 8, corolla tubular, pubescent, tube 2.5 mm. long, lobes — 
I mim. long, the monodelphous filament slightly exserted beyond 
the corolla, anthers about 1mm. long: style simple, about one- 
half the (length of the corolla tube: receptacle minute, paleae 
only one or two, linear, gmm. long, veined and glandular: em- 
bryo straight. The extremity of each of the lateral branches of 
the inflorescence usually terminates in a cluster of male flowers. 
These have only the outer series of small bracts and inclose 
about twelve tubular flowers. 
The type is deposited in the Nevada Agricultural Experi- 
ment Station herbarium, and was collected near Soda Lake, Car- - 
son Sink region, Churchill county, Nevada, at an elevation of 
4276 feet, October, 1907, P. B. Kennedy (No. 1715). 
The species seems to resemble D. Brandegez in the charac- 
ter of the achene, and D. canescens in the size and character of 
the bracts. It is about what we might expect if these two spe- 
cies were to be crossed.. The differences nay be enumerated as 
follows: 
1. The character of the achene, having teeth instead of a 
wing and no posterior or anterior wing, and the length of the 
style branches. 
2. The shape and number of the involucral bracts, being 
hooded and twice as long as the achene. 
3. The number of achenes being usually three. 
I take pleasure in naming the plant in honor of Miss Mary 
R. Clark, one of the few plant enthusiasts residing in the State 
of Nevada. 
University of Nevada, Reno, Nevada. 
