CONTRIBUTIONS FROM THE ROCKY MOUNTAIN 
HERBARIUM. II. 
AVEN NELSON. 
SOME COLORADO SPECIES. 
AN interesting collection of Colorado plants, some 300 
numbers, was kindly submitted to me for examination by Pro- 
fessor Ramaley, of the University of Colorado. They were 
largely of his own collecting, but some of them were by F. Y. 
Moseley, and yet others by Jennie M. Archibald, of Berwind, 
Colorado. Among them were many of much interest and a few 
novelties, upon which the following notes and characterizations 
are offered. 
ZYGADENUS COLORADOENSIS Rydb. This interesting recently 
described ally of Z. elegans seems to be peculiarly a Colorado 
species, as I have not yet met with it in Wyoming. 
CHEIRANTHUS sp. A peculiarly branched form, with petals 
almost rose-colored, was represented by two numbers. It was 
evidently not far from C. asper Nutt., but fruiting specimens 
may show it to be distinct. 
Crematis Scorri Porter. This rare plant was represented by 
rather young specimens, but even these indicated the distinctness 
of the species as compared with C. Airsutissima Pursh. 
SAXIFRAGA RHOMBOIDEA austrina, n. var.—Size, habitat and 
foliage of the species: stems not rarely several from the short 
rootstock, pubescent with gland-tipped hairs as is also the inflo- 
rescence: inflorescence paniculately cymose, strict: calyx lobes 
obtuse, as long as the adnate base: petals elliptic, white, 3" 
long: carpels ovoid, the tips at length widely divaricate : seeds 
very numerous, brown, oblong, more or less subacute at both ends. 
That this is a good species seems quite possible. The paniculate inflo- 
rescence and conspicuously gland-tipped pubescence is in strong contast to 
the usually spherical terminal cluster (which at most becomes only branched- 
thyrsiform) and the glandless pubescence of S. rhomboidea Greene, Pitt. 
304 : [JUNE 

