178 'memoirs of the new YORK BOTANICAL GARDEN. 



*Cardamine oligosperma Nutt. : Torr, & Gray, Fl. N. A. i : 85 



[Syn. Fl. i^: 158; Bot. Cal. i: 30]. 



Like the last, but with erect, few- (8-20) seeded pods and a very 

 short style. It is a plant really belonging to the region west of the 

 mountains, but collected at one place near a spring, at an altitude 

 of 2000 m. 



Montana: Bridger Mts., June 14, 1897, Rydbcrg & Bcsscy, 

 4136. 



* Cardamine unijuga Rydberg, Bull. Torr. Bot. Club, 24 : 246. 



Resembles the last but has only one pair, or seldom two pairs, of 

 oblong leaflets on the stem leaves, the basal ones being mostly simple, 

 small, cordate, obtuse and rounded sinuateh' 3-lobed. It is fairly 

 common in- swampy ground in southern Montana and the Park, at 

 an altitude of 2000-2500 m. 



Montana: Spanish Basin, 1896, Flodman^ -/P-/-' July i, 1897, 

 Rydbcrg & Bessey, 416J and 4164 (large-leaved form with 2 pairs of 

 leaflets). 



Yellowstone Park: East De Lacy's Creek, Aug. 10, 1897, 

 Rydbcrg- ct- Bcsscy, 4163 : Mirror Lake, 1885, Tzi'ccdy, ^yi . 

 Physaria didymocarpa (Hook.) Gray, Gen. 111. i: 162 [111. Fl. 2: 



135; Bot. Cal. i: 47; Syn. FL i^ : 121; Man. R. M. 26] ; 

 Vesicaria didyniocarfa Hook. Fl. Bor. Am. i : 49. 



Among exposed rocks, often on the top of the mountains, at an 

 altitude of 1500-3000 m. 



Montana: Little Belt Pass, 1896, Fhdniaii, 4^6; Cottonwood 

 Creek, 4^3; Bridger Mts., June 15, 1897, Rydbo-g d- Bcsscy, 

 416^: Cedar Mountain, July 16,4168; near Indian Creek, July 22, 

 4166; Bozeman, 1882, R. Tzcccdy ; Madison Co., 1888, iig: Belt 

 Mountains, 1886, R. W. Anderson, 41: Bozeman, 1892, W. T. 

 Shazo; Missoula Co., Mrs. Kennedy; Belt River, 1888, R. S. 

 Willianis, jij; Bozeman, 1883, Scribncr, 81; Fort Ellis, 1871, 

 Haydcn; Birch Creek, 1883, Canby, 24. 



Yellowstone Park: 1888, Dr. C/ias. H. Hall; Mammoth Hot 

 Springs, 1884, Tzvccdy, 206. 



* Physaria Geyeri (Hook.) Gray, Gen. 111. i: 162 [Syn.Fl.i': 121] ; 



Vesicaria Geyeri Y{oo\l. Lond. Journ. Bot. 6: 70. 



Similar in habit to the preceding, but with a much smaller pod, 

 which is compressed laterally and has a broad shallow rounded 

 sinus at the apex. Rare in Montana. 



Montana: Madison Co., 1888, F. Tzveedy, iig. 



