NOTES ON MACHJERANTHERA. 28 
M. PULVERULENTA. Dieteria pulverulenta, Nutt. 1. c. 300. 
M. montana, Greene, l. c, in part. Biennial, erect, about a 
foot high, somewhat fastigiately panicled, more or less ca- 
nescent with a fine pubescence, this on the peduncular 
branchlets and involueres mixed with sessile or subsessile 
very minute resiniferous glands: rather small and scattered 
leaves oblanceolate, entire or serrate-toothed: heads small, 
subturbinate; involucral bracts in about 3 series, rigid, their 
short green tips suberect: rays few (8 to 12). 
Common on elevated plains in Wyoming, northern Col- 
orado, etc.; a much smaller and more slender plant than 
M. viscosa, and occupying a totally distinct and higher alti- 
tudinal belt. 
M. pivaricata. Dieteria divaricata, Nutt. l. e. 301, in part. 
M. montana, Greene, l. c. in part. Rather larger than the 
last, the branching divaricate and diffuse rather than fas- 
tigiate: involueres much larger, hemispherical, their bracts 
in about four series and with abruptly recurved green tips: 
rays 12 to 16. 
Of the same range as the last, and with similar foliage . 
and pubescence; perhaps confluent or hybridizing with it, 
yet generally distinguishable even in the herbarium by the 
involucre and mode of branching. In duration it appears 
to be biennial. 
M. suBALPINA. Stems several, erect, only 5 to 10 inches 
high from a perennial root, the heads few and subracemose ; 
herbage cinereous-puberulent, but the involucres and their 
pedicels viscid-granular: leaves narrowly oblanceolate, acute, 
entire: heads rather small, the involucres subturbinate, their 
rather broad erect granular bracts in about 3 series, acute, 
not spreading: rays 8 to 12, broad, purple. 
I have this plant only from Mr. Nelson of Wyoming. His 
tickets do not indicate the elevation; but Iam confident 
that it must belong to a higher altitude than the foregoing. 
The locality given is Bacon Creek. It is next of kin to my 
M. letevirens, but is of different habit, with narrow foliage, 
and is pale with an ashy pubescence. 
