1 1 Rydberg : Studies on the Rocky 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. paniculatiis. It is what has been 

 known as Z. Nuttallii 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. glaherrimus and that the plants here discussed should be 

 known as Toxicoscordion. 



JUNCACEAE 



The following species of Junciis are found in the Rockies: 

 Juncus uncialis Greene, /. Jonesii Rydb., /. Regelii Buch., 

 /. Tracyi Rydb., and /. mexicaniis in Utah; J. columhianus 

 Coville and /. Regelii Buch. in Montana; and /. arizonicus in 

 Colorado. Professor Nelson includes Colorado in the range of /. 

 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 /. 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 



