537 RvDBERG : Studies ox Rocky Mountain Flora 



A rather stout light green plant 3-4 dm. high. I^ulbs rounded 

 ovoid, 3-4 cm. long and about 3 cm. in diameter : leaves scabrous, 

 especially on the margins and midribs, 1.5-2.5 dm. long, 5-8 mm, 

 wide, keeled, conduplicate, and generally decidedly falcate, all with 

 scarious sheaths : raceme short, in fruit elongated : flowers yellow : 

 petals and sepals about 5 mm. long, acute ; the former deltoid 

 ovate, acute at the base ; the latter ovate, sub-cordate at the base 

 and with claws i mm. long : glands semi-orbicular, upper margin 

 toothed, thin and not well defined : capsule ovoid cylindrical. 



All the specimens cited below have been named Z. Nuttallii 

 though the plant is more closely related to Z. paniciilatns, from 

 which it differs in the distinctly clawed petals which are subcordate 

 at the base. These characters, together with the more distinct 

 glands and the slightly adnate filaments, distinguish it from Z. 

 Nuttallii. Z. falcatus inhabits the foothills of Colorado at an alti- 

 tude of about 1500 m. 



Colorado: Fort Collins, 1893, C. S. Cra ndall {tyT^t) ; 1896. 

 C. F. Baker ; Denver, 1873,/. M. Coulter. 



Zygadenus paniculatus (Nutt.) Wats. Bot. King's Exp. 5 : 343, 



1871 



Helonias paniculata^nit. ]o\xn'\. Phila. Acad. 7: 57. 1834. 



It is well characterized by Watson and easily distinguished by 

 its stout habit, generally branched inflorescence, and rhombic - 

 ovate acute and almost clawless petals and sepals. It grows on 

 hills up to an altitude of 1500 m., ranging from Montana and 

 Washington to New Mexico and California. The following Rocky 

 Mountain specimens belong here : 



Utah: Ogden, Capt. Stansbury ; City Creek Canon, \Z%o, M. 

 E. Jones, i6j/j.. 



Idaho: Boise, \Z<^2, Isabel Mulford. 



Montana: Grasshopper Valley, 1880, JVatson (?). 



Zygadenus Nuttallii A. Gray, in Wats. Proc. Am. Acad. 14 : 279- 



1879 



Aniiantlmun Nuttallii Gray, Ann. Lye. N. Y. 4 : 123. 



This is evidently a species belonging to the plains. All the 

 specimens in the Columbia and N. Y. Botanical Garden herbaria 

 are from Arkansas and Kansas. Dr. Watson included Texas and 



