535 Rydberg: Studies on Rocky Mountain Flora 



glands. It is more slender and strict than all the species except 

 Z. acutus, which is easily distinguished by its acute sepals and 

 petals. Z. vencnosus grows mostly on hillsides at low altitudes, 

 scarcely ascending higher than 2000 m. It ranges from Idaho and 

 British Columbia to California and Utah. The following Rocky 

 Mountain specimens belong here : 



Utah: Parley's Peak, 1869, S. Watson, ii6j. 



Idaho: Keeley's Hot Springs, i^g2, Isabel Miilford; Big Pot- 

 lash River, 1892, Sandberg, MacDougal & Heller, Jig ; Little 

 Potlash River, ^o/. 



Zygadenus gramineus sp. nov. 



Zygademis vencnosus Rydb. Cont. U. Dep. Ag. 3 : 525. 1896. 

 Mem. N. Y. Bot. Card, i : 93 in part. Not S. Wats. 



A slender yellowish-green plant, 2-3.5 elm. high. Bulb 

 elongated ovoid, 2-3 cm. long and 1-1.5 cm. in diameter: leaves 

 narrowly linear, scabrous on the margins and the midrib, 1-2 dm. 

 long, 3-5 mm. wide, conduplicate and somewhat falcate, all with 

 distinct scarious sheaths surrounding the stem : racemes rather 

 short : bracts scarious, lanceolate, long-acuminate : flowers light 

 yellow : sepals broadly ovate, obtuse at the apex, acute at the base 

 and very short-clawed : petals ovate, obtuse, subcordate at the 

 base and with claws about i mm. long : glands almost semi-orbic- 

 ular ; upper margin toothed, but thin and not well defined : cap- 

 sule elongated ovoid, 8- 10 mm.- long, 3-4 mm. in diameter. 



Z. gramineus resembles somewhat the preceding, but is lower, 

 of a yellowish color ; its stem leaves are evidently sheathed, the 

 sepals are short clawed, not subcordate at the base and the gland 

 thin and without a distinctly thickened upper border. Z. gramineus 

 grows on hillsides up to an altitude of 2500 m. ; from Saskatchewan 

 and Alberta, south to western Nebraska and Idaho. 



Montana: Spanish Basin, 1897, Rydberg &• Bessey, 3848 

 (type); 1896, Floduian, j^j ; Helena, 1891, F. D. Kelsey. 



Idaho: Beaver Cafion, 1895, Rydberg. 



South Dakota: Hot Springs, 1892, Rydberg, loji. 



Wyoming: Yellowstone Park, 1888, Dr. Chas. H. Hall. 



Saskatchewan: 1858, E. Boiirgeau. 



Zygadenus intermedius sp. nov. 

 Zygadenus vencnosus Rydberg, Mem. N. Y. Bot. Gard. i : 93 

 in part. 1900. Not Nutt. 



