110 RvypBERG: STUDIES ON THE RocKyY MOUNTAIN FLORA 
species distinct from Z. intermedius, being a dry hill state of the 
same with smaller flowers and narrower leaves. Z. falcatus 
Rydb., which Nelson reduced to a synonym, I think is perfectly 
distinct and nearer related to Z. paniculatus. It is what has been 
known as Z. Nutiallii from Colorado. The latter is not found in 
the range and should have been excluded. 
I have here used the name Zygadenus, as the species were first 
described under that name. I have shown that this name belongs 
to Z. glaberrimus and that the plants here discussed should be 
known as Toxicoscordion. 
JUNCACEAE 
The following species of Juncus are found in the Rockies: 
Juncus uncialis Greene, J. Jonesii Rydb., J. Regeliit Buch., 
J. Tracyi Rydb., and J. mexicanus in Utah; J. columbianus 
Coville and J. Regeliti Buch. in Montana; and J. arizonicus in 
Colorado. Professor Nelson includes Colorado in the range of J. 
ensifolius Wikstr. I have seen no specimens of it from that state. 
The best character, beside the difference in the number of stamens, 
by which one can distinguish this from J. saximontanus, is that 
the scarious margin of the leaf sheaths in the latter ends in a small 
auricle, while in J. ensifolius the margin gradually diminishes 
and disappears in the blade. 
ALLIACEAE 
DIPTEROSTEMON gen. nov. 
Plants with fibrous-coated bulbs, few basal elongated narrow 
leaves and naked scapes. Flowers in subcapitate umbels; bracts 
3-5, membranous, colored, usually purple; perianth funnelform 
or campanulate, purple; segments united about half their length; 
lobes elliptic, ascending; stamens six; filaments subulate, adnate 
to the tube, becoming distinct at the throat; those opposite the 
sepals naked; those ‘opposite the petals at the base with two 
lanceolate wings or lobes, surpassing the anthers; anthers basi- 
fixed; capsule ovate, 3-locular; cells many-seeded. . 
Some of the species formerly included in Brodiaea and lately 
in Dichelostemma differ from the rest enough, I think, to deserve 
generic rank. The type of Brodiaea is B. grandiflora Smith. 
This is the same as Hookera coronaria Salisb., published a few 
