430 ROSACEAE 



Sepals ovate or ovate-lanceolate; petals yellow, strongly ascending. 



Hypanthium and calyx densely hairy with black glandular hairs, only slightly to- 

 mentose. 3. D. Drummondii. 



Hypanthium and calyx densely white-tomentose, not glandular. 4. D. tomentosa. 



1. D. integrifolia Vahl. Leaf-blades lanceolate or elliptic-lanceolate, 

 rounded, truncate, or subcordate at the base, acutish at the apex, 6-25 mm. long, 

 usually with entire revolute margins, densely white-tomentose beneath, glabrate 

 and shining above; scapes 5-15 cm. long, tomentose; hypanthium and calyx 

 tomentose and usually more or less densely black- or brown-hairy; sepals linear 

 or linear-lanceolate, 5 mm. long; petals white, elliptic, 8-12 mm. long. Ridges: 

 Greenl. Lab. N.H. B.C. Alaska. Alp. Je-Jl. 



2. D. octopetala L. Leaf-blades oblong, elliptic or oval, white-tomentose 

 beneath, glabrate and dull above, 6^25 mm. long, rounded or obtuse at both 

 ends, or subcordate at the base; scape 5-20 cm. long, tomentose and more or 

 less black-hairy; hypanthium black-hairy and tomentose; petals white, elliptic 

 or obovate-elliptic, 1-1.5 cm. long. Ridges: Greenl. Colo. Wash. Alaska; 

 alpine and arctic Eurasia. Alp. Subalp. Je-Au. 



3. D. Drummondii Richards. Leaf-blades elliptic or obovate, 1-3 cm. 

 long, white-tomentose beneath, dark green, dull, slightly tomentose or glabrous 

 above, veiny and somewhat rugose, coarsely crenate, acute at the base and 

 rounded at the apex; scape 5-20 cm. long, tomentose and somewhat black-hairy 

 above; petals yellow, about 1 cm. long, elliptic-spatulate or obovate. Ridges: 

 Que. Mont. Ore. B.C. Mack. Alp. Subalp. Je-Au. 



4. D. tomentosa Farr. Leaf-blades obovate or elliptic, 1-2 cm. long, coarsely 

 crenate, acute at the base, rounded at the apex, tomentose on both sides, grayish- 

 green above, white beneath; scape 5-10 cm. long, densely white-tomentose; 

 sepals ovate, 5 mm. long; petals yellow, spatulate, 8 mm. long. Ridges: Alta. 

 B.C. Subalp. Jl. 



26. GEUM L. AVENS. 



Perennial herbs, with rootstocks. Basal leaves lyrately odd-pinnate, with 

 large terminal divisions; stem-leaves few, reduced, most often 3-fid or the upper 

 bract-like. Stipules persistent, adnate to the clasping bases of the petioles. 

 Flowers cymosely corymbose. Hypanthium turbinate, hemispheric, or saucer- 

 shaped. Bractlets 5, sometimes reduced. Sepals 5, imbricate or valvate. 

 Petals 5, orbicular, obovate, or cuneate, yellow, white, or red. Stamens numer- 

 ous, in several series; filaments free, filiform. Pistils numerous, inserted on a 

 clavate receptacle; styles filiform, terminal, strongly curved and geniculate 

 above, the upper portion deciduous. Achenes small, dry, with a hooked beak. 

 Seed erect. 

 Sepals reflexed; upper internode of the style less than one-third as long as the lower. 



Petals white or ochroleucous ; receptacle long-hairy ; hairs at least half as long as the 

 achenes. 1. G. canadense. 



Petals bright or golden yellow; receptacle short-hairy. 



Leaflets of the stem-leaves decurrent on the rachis, the upper ones confluent. 



2. G. decurrens. 

 Leaflets of the stem-leaves not decurrent. 



Upper internode of the style hirsute, the hairs about 1 mm. long; lower inter- 

 node hirsute below, not glandular; petals orbicular, rounded at the base. 



3. G. strictum. 

 Upper internode of the style short-hispidulous at the base or glabrous ; petals 



usually cuneate at the base, except in G. perincisum; lower internode 

 of the style glandular-puberulenb. 



Divisions of the upper stem-leaves ample, rhombic or cuneate; inflores- 

 cence corymbiform, usually with short branches. 4. G. macrophyllum. 

 Divisions of the upper small stem-leaves oblanceolate or rarely obovate; 



inflorescence open, with slender branches. 

 Leaflets doubly serrate or dentate; terminal leaflet of the basal leaves 



rounded or reniform. 5. G. oregonense. 



Leaflets especially those of the upper leaves deeply incised; terminal 

 leaflet of the basal leaves rhombic, ovate, or subcordate. 



6. G. perincisum. 



Sepals ascending or merely spreading ; upper internode of the style at least half as long 

 as lower internode, hirsute; petals flesh-colored, purple- veined. 7. G. rivale. 



1. G. canadense Jacq. Stems 3-10 dm. high, finely pubescent or glabrate; 

 blades of the earlier basal leaves reniform or rounded-cordate, round-lobed and 



