S2 LAWSON : EKVISION OF THE 



A. NuUaUiana. DO. Syst. Nat.. I., p. 198. Kichardson, in Frankl. Jour., p. ]2. Niittall, 

 Jour. Acad. Phil., V., p. U?>. 



Pulsatilla NuUaUiana. " Spreng. Syst., II, p. 033." Gray, Manual, ed. 2, p. 4. 



A. flavescens. " Zucc, in Eegeusburg Zeitung, I., p. 3*71." 



P. patens, fi. Wolfgangiana. Trautv. & Meyer (exc. syn.), according to Eegel. 



P. patens. G-ray, Gen., I., p. 18, t. 3. PI. Feudl, p. 4. Lawsou, Trans. Bot. Soc, 

 Ediu., X., p. 346. Ranuuc. Canad., p. 22. 



A. patens, yar. NuUalliana. Gray, Manual, od. 5, p. 3<j. Watson, Bibl. Index, p. 5. 

 Macoun, Cat., p. 12. 



Profusely in tlie eastern prairie district ; and more scattered in the central limestone 

 tracts, from lat. 45^ to 6Y' on the Mackenzie. — Richardson. Valleys in the Tiocky Mountains. 

 — Drummond, Douglas. 



Fort Eeliance, 68' N. 109".— IT. R. King, (Back's Exped.) Cumberland House, alt. 

 900 feet, in fl. May 1st, 1S20.— Richardson. Carlton House, lat. 52° 51' N., long. 106" 13' W., 

 on the eastern limits of the Saskatchewan prairie lands, elevation above the sea about 

 1,100 feet, April 22, 1821, in fi.— Richardson. 



Fort Simpson, 1853 ; between Fort Toucon and Lapierre House, west side of Eocky 

 Mountains ; Mackenzie Eiver, near Fort Simpson, 8th June ; Fort Chipewyan, 4th and 

 16th May, 1861; Fort Simpson, in ft.; Yukon Eiver; on Anderson Eiver and at Fort 

 Good Hope ; Eocky Mountains, Van Express Party, spring of 1854 ; Athabasca Eiver, 31st 

 July, 1852, in fl. — McTavish. Lake Manitoba, June, July, 1861, in fl. and ft. — Dr. Schultz. 

 Cypress Hills, 9th June, 1883. — Dr. G. 31. Dawson. Manitoba House, Lake Manitoba, June 

 18th, 18S1.— Macoun. Alaska.— Rothrock. 



This species extends to New Mexico. It is widely spread through the Eussian 

 dominions of Northern Europe and Asia. Prof Macoun observes that it is abundant on 

 dry gravelly soil from the eastern margin of the prairie region, through the Eocky 

 Mountains, westward to the coast ranges. 



Sir "William Hooker, in Fl. Bor.-Am., remarked : " There is no difference whatever 

 between this American plant and the A. patens which I possess from the Eussian Empire, 

 and from Silesia on the borders of Poland. Both are liable to vary in the breadth of the 

 segments of their leaves, and in the colour of their flowers. Mostly, however, these are 

 pixrple. The pale yellow-flowered- variety from Siberia is cultivated in England. The 

 plant aflects sandy soils, and its blossoms appear among the earliest of the season." On 

 May 25, 1883, I found it blooming brightly on dry knolls at the Crested Buttes, 

 Colorado, the ground covered with a few inches of snow that had fallen the night before, 

 but not deep enough to bury the large flowers. The recent tendency has been to regard 

 our American plant as essentially distinct from the European. I am still doubtful by 

 what characters to separate it, and have, on that account, retained the Linnsean'name. It 

 is a variable plant in Europe and Northern Asia. In the allied A. Halleri of Switzerland, 

 the divisions of the leaves and invohrcre are proportionately much shorter, and the flower 

 rather larger. P. vulgaris of Europe has pinnatisect foliage. 



