MELANTHACEAE. 77 



pine; Ruxton Park; Minnehaha; Mount Garfield; mountains above Gray- 

 mont ; Medicine Bow Mountain ; Silverton. 



2. Anticlea coloradensis Rydb. In the mountains from Colo, to Utah and 

 N. M. Alt. 8500-12,000 ft. Idaho Springs ; Leroux Creek ; Mt. La Plata ; 

 Marshall Pass; Steamboat Springs; Estes Park; Middle Park; Pike's Peak; 

 high mountains about Empire ; divide between Arkansas River and Bayou 

 Salade ; foot-hills, Larimer Co. ; above Beaver Creek ; Rist Canon ; bank 

 of the Michigan; Gore Pass; Stove Prairie Hill; Redstone; Baxter's ranch; 

 Buffalo Pass ; Medicine Bow Mountains. 



3. TOXICOSCORDION Rydb. POISON CAMASS, DEATH CAMASS, HOGS' 



POTATO. 



Petals and sepals rounded or obtuse at the apex ; leaves 3-5 mm. wide. 



i. T. gramineum. 

 Petals and sepals acute at the apex; leaves over 5 mm. wide. 2. T. falcaturu. 



1. Toxicoscordion gramineum Rydb. (Zygadenus venenosus Wats., in part.) 

 Gravelly hillsides from Sask. to Ida. and Colo. Alt. 5000-7000 ft. Howe's 

 Gulch. 



2. Toxicoscordion falcatum Rydb. {Zygadenus Nuttallii Coulter, in part ; 

 not A. Gray.) Hills and mesas of Colorado. Alt. 5000-7500 ft. Fort Col- 

 lins; La Veta; Walsenburg; Los Pinos ; Denver; Spring Canon near Cal- 

 loway Ranch ; Palmer Lake ; Boulder. 



Family 25. JUNCACEAE Vent. RUSH FAMILY. 



Leaf-sheaths open; capsules i- or 3-celled, with axial or parietal placentae; seeds 



many. i. Juxcus. 



Leaf -sheaths closed; capsule i -celled, with basal placentae; seeds 3. 



2. JUNCOIDES 



i. JUNCUS L. RUSHES. 



I. Lower bracts of the inflorescence terete, erect, appearing like a continuation 



of the stem ; inflorescence therefore apparently lateral. 



A. Flowers several in a more or less compound panicle ; seeds apiculate 



(EFFUSI). 



Stem light-green, striate when dry, on account of the free hypodermal fibro- 

 vascular bundles; sepals and petals green; stamens 3. 



i. /. filiformis. 

 Stem dark-green or at the base purplish, not. striate ; sepals and petals dark 



purplish-brown ; stamens 6. 



Inflorescence congested; branches 1-3 cm. long; petals and sepals acute or 

 short-acuminate, almost equal in length. 2. J. balticus montanus. 



Inflorescence open ; branches 4-8 cm. long ; sepals long-acuminate and much 

 exceeding the acute petals. 3. /. balticus vallicola. 



B. Flowers 1-5, of which one is subsessile and the others pediceled (SUBTRI- 



FLORI). 

 Upper sheath merely bristle-pointed ; petals and sepals with green backs and 



dark-brown margins. 4. /. Drummondii. 



Upper sheaths leaf-bearing ; green backs of the petals and sepals less prominent. 



Sepals and petals linear-lanceolate, light-brown ; capsule acute. 



5. /. Parryi. 

 Sepals and petals broadly lanceolate, very dark -brown ; capsule retuse. 



6. /. Hallii. 



II. Lower bracts not appearing as a continuation of the stem, or if so channeled 



on the upper side ; inflorescence terminal. 



