320 Rydberg: Studies on the Rocky Mountain flora 



Thalictrum columbianum sp. nov. 



A plant resembling T. venulosum Trelease in habit; stem 3-5 

 dm. high; leaves 2-4 times ternate, petioled except the uppermost; 

 leaflets rather crowded, thick, and veiny, 1-2 cm. long, cuneate to 

 nearly orbicular, 3-lobed and deeply toothed; inflorescence narrow; 

 achenes oblong- or ovate-lanceolate, somewhat flattened, 4-5 

 mm. long, 1.5-2 mm. wide; veins strong, but not corky, and with 

 broad and shallow grooves between. 



The western specimens referred to T. venulosum by Dr. W. 

 Trelease belong to this species, which differs mainly in the structure 

 of the achenes, these approaching those of T. megacarpum Torr. 



Washington: Loomiston, August 1897, Elmer $qq (type, in 

 herb. N. Y. Bot. Garden); Yakima County, 1892, Henderson 2376. 



Idaho: Pend d'Oreille River, 1861, Lyall; Lake Waha, July 

 1896, A. A. & E. Gertrude Heller 3361; De Lamar, July 7, 1892, 

 Miss Mulford. 



Oregon: 1886, Cusick 1337. 



Delphinium Leonardi sp. nov. 



A perennial with a tuberous root; stem 2-5 dm. high, viscid- 

 pubescent, especially above; blades of the basal leaves 4-5 cm. 

 wide, dissected into oblong, obtuse divisions, more or less viscid- 

 pubescent; upper leaves with linear, acute divisions; lower pedicels 

 4-8 cm. long, ascending; sepals dark blue, oblong, obtuse or the 

 upper acute; spur about 2 cm. long, slightly s-curved; upper 

 petals whitish, veined with blue, emarginate; lower petals blue, 

 with short lobes; follicles over 2 cm. long, curved, viscid-pubes- 

 cent or in age glabrate; seeds dark brown, wing-margined. 



It grows on river banks and beaches at an altitude of 1,800- 

 2,400 m. It is related to D. bicolor Nutt. but differs in its longer 

 spur, which is half longer than the obtuse instead of acute lateral 

 sepals. 



Utah: Garfield, May 30, 1884, Leonard 205 (type, in herb. 

 N. Y. Bot. Garden); City Creek Canyon, April 21 and May 17, 

 1883, Leonard 32 and 24. 



Delphinium coelestinum sp. nov. 



A perennial with a short rootstock and strong woody roots; 

 stem 3-5 dm. high, glabrous or slightly pubescent above, leafy; 

 leaves long-petioled ; blades about 3 cm. broad, sparingly pubescent, 



