22 



by a mat 2-4 inches wide scarcely rising above the ground ex- 

 cept the peduncles, and growing in rocky talus along with Ca- 

 rex, Poa, and Astragalus. Gathered in the East Humboldt 

 mountains, Nev., at about 11,000 feet alt., above Clover Valley, 

 Aug. 2nd, 1901. I searched in vain for C. nivalis Watson 

 there, but it was collected farther south in the range opposite 

 Rubv Valley. Comparing this with specimens of the true C. 

 albifiorus from Yellowstone Park, the seeds are almost iden- 

 tical as well as the involucels, but the leaves, erect habit and 

 long rays are very different. 



Densely caespitose in clumps a foot or two across in the 

 clefts of rocks, the crowns an inch or more thick with the 

 densely clustered old leaf-petioles concealing the short sheaths, 

 the crowns sometimes half a foot long and covered throughout 

 with these sheaths, then much branched with many subsidiary 

 crowns, but all concealed in a broad top from which arise sev- 

 eral to many acaulescent rather slender peduncles a foot or 

 less long; leaves with petioles often as long as the blades, the 

 whole 4-8 inches long long, very scabrous, outline narrowly 

 lanceolate, tri-pinnate, final segments oblanceolate, 1-3 lines 

 long; flowers many, white, in loose heads, with several stout 

 rays about 3 lines long and filiform pedicels as long; involucres 

 none or a rudimentary purplish and hyaline collar, involucels 

 of several filiform weak bracts fully as long as the pedicels 

 which are sometimes purplish and a trifle united below into a 

 rudimentary collar; in fruit the rays and pedicels elongate in 

 the type to 6 lines long and the rays are nearly equal ; fruit in 

 the type oblately orbicular, 3 lines long, deeply emarginate at 

 both ends, the body 1 Hne wide, with 8 oil tubes on the com- 

 missure and about 3 in the intervals, cross section fish-hook- 

 shaped one lateral wing appearing as if on the inner face, lat- 

 eral wnngs about 1^^ lines wide, corky about the same width 



middle, dorsal wings about as wide a» the lateral, all three de- 

 veloped. Indian Spring Charleston mountains, Nevada, Mav 

 7th, 1906, in the Tropical Life Zone near its upper edee, 4000 

 feet alt. ^^ ^ 



Cymoptcnis aboriginum var. ovalis n. var. 



Fruit oval. 3 lines long, the body about % line wide and 

 scarcely half the width of the wings, which are all equally de- 



