440 EXPLORATIONS ACROSS THE GREAT BASIN OF UTAH. 



elongatls complanatis curvatis ; centralibus 4, sumino elongato complanato pergamen^ 

 taeeo floxuoso alljo, 3 reliquis paullo brevloribiis obsciiris omnibus sen solum infimo 

 Lamntis ; floribus mlu(uil)iis ; ovano squamis sepaloideis 5 oblongis nuinlto ; sepalis 

 tubi lliiearlbus marglue membranaceis iiitegTis mucronulatis, potalis angustis ol^longis ; 

 stio-matibus 6-7 brevlbiis in eapitukim g-lobosum congestis; bacca ovata parce sqiui- 

 iiiata floris rudimentis persistentibus coruiiata. 



The species was originally discovered on tlie Little Colorado by Dr. Bigelow, and 

 was found nfterward on the same stream by Dr. Newberry; the variety liere described 

 was met with more than 5 degrees forthcr north, in Desert Valley, west of Camp 

 Floyd ; remains of fruit, with the withered flowers attached, and some seeds, were 

 found concealed between the sphies from which the description has been drawn.* 

 Globose heads 3 inches in diameter, radial spines ^-1| inches long, centi-al ones 1^-2 

 inches in length ; flowers, if I may judge from the withered remains, about 1 inch 

 long; ovary small, bearing about 5 membranaceous scales, the lower triangular, 

 thfi nnner ol)h>no'-linear. almost entire, and never cordate or auriculate at base, as they 



of tlie allied species ; sepals of tube also narrow, linear, or oblong-lin- 

 les long, ^-1 lino wide, stigmas about J line long. Fruit apparently 

 A inch long; seed just as it is described and figured in Whipple's Cac- 



taceai ; the tubercules on the seed-coat are extremely minute and distant fr 



cell of 



forming a central protuberance on the otherwise flat surface of an angular 

 or three times the diameter of the tubercule itself; embryo curved about 



ound 



Cereus tiridiflorus, Enfjdm. in Wisl'iz. Mem. note 8, suh Ecliinoccreo ; Cad. 



2Iex. Bound, t 3G ; Synoxjs. Cad. j). 22. 



This is evidently the northernmost Cereus, extending to the Upper Platte ; it is 

 abundant in Colorado. These northern specimens are 1-3 inches high, 13-ribbed, and 

 show the greatest variability in the color of the radial spines ; in some bunches, they 

 are all red, in others white, in others again the colors are distributed without much 

 regularity ; sometimes the upper and lower spines are white and the lateral ones red, 

 or a few or even a single one above and below are red and all the rest white ; or the 

 low cr ones are red and the upper ones white, and all these variations sometimes occur 

 on the same specimen. I mention tliis to show how little reliance can be placed on 

 the colors or the distribution of the colors of the spines. Central spines wanting or 1 

 or 2 projecting horizontally, straight or curved upward, white or tipped with purple 

 or all purple, G-9 lines |n length. 



Cereus Enoelmanxi, Farrij in Sllllm. Jouni. n. ser. 14, p. 338 ; Ewjelm. Cad. 

 Bound, p. 36, t. 57 ; Synops. Caet. p. 27. 



w 



Deserts west of the Salt Lake, without flower or fniit. Specimen entirely simi- 

 lar to the one figured in the Cactaceae of the Boundary. The species seems to extend 

 from the Salt Lake region southwest wardly to Arizona nnd the Moliave country. 



* The botanist of Dr. Haydeu's Expedition of 1875, Mr. Brandegee, found it abuiidautly iu Soutlivvestern Colo, 

 rado (January, 1876). 



