692 Rvdberg: Rocky Mountain flora 



outline, twice or thrice pinnatifid into oblong or lanceolate divi- 

 sions ; scape villous-tomentose, 5-20 cm. high ; spike dense or in 

 fruit more lax ; bracts and calyx densely white-villous ; corolla 

 about 6 mm. long, dark -blue or purple, or in age paler ; lobes 

 broadly obovate ; stamens slightly exserted ; ovary villous ; fruit 

 obovate, 6 mm. long, villous or in age glabrate. 



This species is related to Synthyris pinnatifida, and has been 

 mistaken for it, but it diners in the more copious pubescence, espe- 

 cially on the calyx and ovary (in 5. pinnatifida these are glabrous 

 or merely puberulent on the margins), in the larger dark corolla 

 with obovate instead of oblong lobes, and in the larger fruit. 

 5. dissecta grows at an altitude of 2000-3000 m. 



Montana: Near Bozeman, June 11, 1900, Chesnut & Jones 

 igg (type, in herb. N. Y. Bot. Gard.) ; Bridger Mountains, June 

 15, 1897, Rydbcrg & Bessey 492 7 ; same locality, 1899, Flaherty, 

 and June 26, 1899, Blankinship ; Old Hollowtop, July 7, 1897, 

 Rydbcrg & Bessey 4926 ; Beaver Head Co., June, 1888, Tweedy 70. 



Wyoming: Headwaters, Cliff Creek, Aug. 9-18, 1900, C. C. 

 Curtis (good fruit). 



Thalesia Sedi (Suksd.) Rydb. comb. nov. 



Aphyllon Sedi Suksd. Deuts. Bot. Monats. 18: 155. 1900. 



The three species of the Columbia River region, which have 

 usually been included in Thalesia uniflora, differ from the plant of 

 the eastern United States in their longer attenuate calyx- lobes. 

 In all three the lobes are about twice as long as the calyx-tube 

 and narrowly subulate from a broad base ; in T uniflora they are 

 scarcely longer than the tube, lanceolate and gradually tapering 

 from the base of the apex. T. Sedi differs from the other two 

 Columbian species in the lighter-colored corolla, with narrower, 

 oblong acutish or obtuse lobes, while T purpurea Heller and T. 

 minuta (see below) have dark purple corolla and broad, oval or 

 semiorbicular lobes rounded at the apex or sometimes even retuse. 

 It grows on species of Sedum and is distributed through parts of 

 Oregon, Washington, and western Montana. 



Thalesia minuta (Suksd.) Rydb. comb. nov. 

 Aphyllon wiuutu in Suksd. Deuts. Bot. Monats. 18 : 155. 1900. 

 This resembles Thalesia purpurea in the color of the flower 



