STANDLEY — FLORA OF GLACIER PARK. 363 



Petals white, spreading; leaves broadly rounded or notched at the base. 



1. D. octopetala. 

 Petals yellow, erect or ascending; leaves narrowed at the base . . 2. D. drummondii. 



1. Dryas octopetala L. White dryad. Plate 48, B. Common above timber line, 

 on rocky slopes and rock slides. Alaska to Wash., Colo., and Greenl.; also in Eur. 

 and Asia. — Leaves oval or oblong, 6 to 20 mm. long, green and nearly glabrous on 

 the upper surface; stems 5 to 15 cm. long; calyx black-hairy; petals 1 to 1.5 cm. long. 



A handsome plant, whose flowers soon fade. It appears to be more abundant at 

 Piegan Pass than elsewhere, and in some alpine localities it is rare or absent. 



2. Dryas drummondii Richards. Yellow dryad. Occasional above timber line, 

 on rock slides or rocky slopes. B. C. to Oreg., Mont., and Que. — Leaves 1 to 3 cm. 

 long, green on the upper surface; stems 5 to 15 cm. high; calyx black-hairy; petals 

 about 1 cm. long. 



This plant, strangely enough, is abimdant on rocky flats along the creek at St. 

 Mary, and grows more luxuriantly there than at high altitudes. Evidently the seeds 

 have been carried dowTi by water. 



9. GEUM L. AvENS. 



Perennial hairy herbs with rootstocks; leaves pinnate, the terminal leaflet much 

 larger than the others; flowers in cymes; fruit of numerous achenes, each with a 

 hooked beak. — The achenes adhere readily to clothing by means of their beaks. 



Sepals ascending, deep red; petals pinkish or pale yellow 1. G. rivale. 



Sepals reflexed, green; petals bright yellow. 

 Lower part of the style glandular; petals narrowed at the base. 



2. G. macrophyllum. 

 Lower joint of the style hairy but not glandular; petals rounded at the base. 



3. G. strictum. 



1. Geum rivale L. Purple avens. Swampy woods below Lake McDermott. 

 B. C. to N. Hex., N. J., and Lab.; also in Eur. and Asia. — Stems 30 to 80 cm. high, 

 hairy; terminal leaflet 4 to 10 cm. long, often broader than long, lobed and toothed; 

 petals clawed, 7 to 10 mm. long. 



2. Geum macrophyllum Willd. Yellow avens. Common at low and middle 

 altitudes, in moist woods or thickets, in bogs, or on brushy slopes. Alaska to Calif., 

 Mont., N. H., and Newf.; also in Asia.— Plants 30 to 80 cm. high, very hairy; leaflets 

 5 to 15, the terminal one 5 to 10 cm. wdde, lobed and toothed; petals 4 to 6 mm. long. 



3. Geum strictum Soland. Occasional on the east slope at low altitudes, in 

 meadc^-s or swamps. B. C. to Mex., Pa., and Newf. — Stems 40 to 80 cm. high, 

 hairy; leaflets 5 to 9 or more, toothed and often deeply lobed; stem leaves usually 

 with 3 leaflets; petals 5 to 8 mm. long; fruit heads about 1.5 cm. thick. 



10. SIEVERSIA Willd. 



Perennial herbs with thick rootstocks; leaves mostly basal, pinnate, the leaflets 

 deeply lobed ; flowers solitary or in cymes; fruit of numerous achenes, these sometimes 

 with hairy tails. 



Leaflets nearly glabrous; petals yellow; tails of the achenes glabrous. 



1. S. turbinata. 



Leaflets densely hairy; petals pinkish; tails of the achenes hairy .... 2. S. ciliata. 



1. Sieversia turbinata (Rydb.) Greene. Piegan Pass, on open rocky slopes. 



Mont, to Nev. and N. Mex. (Acomastylis turbinata Greene.)- — Plants 5 to 20 cm. 



high, densely tufted; leaflets 11 to 31, deeply lobed, the lobes narrow; petals 6 to 8 



mm. long. 



