ROSE FAMILY 433 



Geum ciliatum Pursh. Erythrocoma dissccfa, and E. ciliata Greene. Mountains 

 and hills: Alta.— N.M. — Utah— Wash.— B.C. Submont.—Suhalp. My-Au. 



S. ciliata X grisea. Intermediate between the two species. E. ausiralis Greene. 



5. S. flavula (Greene) Rydb. Stem 2-3 dm. high, rather slender, yellowish, 

 only slightly tinged with red, finely pilose; basal leaves 5-15 cm. long; principal 

 leaflets cuneate or rhombic-cuneate, finely puberulent, and ciliate on the margins 

 and veins, yellowish green; hypanthium low, hemispheric; bractlets linear-sub- 

 ulate; sepals deltoid-lanceolate, yellow, merely purple- veined ; petals yellow, 

 oval, barely exceeding the sepals. Scarcely distinct from S. ciliata. E. flavula 

 Greene. Mountains: Wyo. — Mont. Mont. My-Au. 



6. S. brevifolia (Greene) Rydb. Stem 1-2 dm. high, with few reduced 

 leaves, pilose; basal leaves niunerous, short, 4-8 cm. long; principal leaflets 

 cuneate in outline, about 1 cm. long, hirsute and glandular-pruinose; hypanthium 

 hemispheric; bractlets linear; sepals elliptic or lance-elliptic, purp le- veined ; 

 petals yellow, elliptic or oval. Closely related to S. ciliata. E. brevifolia Greene. 

 Momitains: c Utah. Suhmont. — Mont. Je-Jl. 



28. ACOMASTYLIS Greene. 



Low cespitose perennials, with strong rootstocks. Basal leaves numerous, 

 pinnately divided, with numerous cleft or toothed divisions; stem-leaves few, 

 reduced and with few divisions. Flowers terminal, solitary or in 2-4-flowered 

 cymes. Hypanthium more or less turbinate. Bractlets and sepals 5. Petals 

 5, obovate, oval, or suborbicular, yellow. Stamens numerous, inserted in the 

 mouth of the hypanthium. Pistils numerous; ovaries hirsute, lanceolate, taper- 

 ing into the glabrous, persistent styles, which do not elongate in fruit; ovules 

 basal. 



Leaves densely silky-canescent. 1. A. sericea. 



Leaves puberulent, somewhat glandular-granuliferous or glabrate, not silky. 



2. A. turbinata, 



1. A. sericea Greene. Stem 1-3 dm. high, slender, silky; basal leaves 5-10 

 cm. long, densely silky-villous ; segments 15-25, cuneate in outline; stem-leaves 

 1-3; hypanthium short-turbinate, 4-5 mm. high and broad; bractlets lanceolate; 

 sepals triangular-ovate; petals yellow, orbicular, 8-10 mm. long. Geum sericeum 

 Greene. Sieversia sericea Greene. Mountains: Nev. — Ida. — Wyo. — Mont. 



2. A. turbinata (Rydb.) Greene. Stem slender, 0.5-3 dm. high, silky- 

 strigose or glabrate; basal leaves 5-15 cm. long; segments 11-33, oblanceolate, 

 obovate, or cuneate in outUne, with lanceolate or oblong lobes; stem-leaves 1-3; 

 hypanthium obconic-turbinate, about 5 mm. high and broad; bractlets lanceo- 

 late; sepals ovate, short-acuminate; petals yellow, broadly obovate or obcordate, 

 6-8 mm. long. Potentilla nivalis Torr. Geum turbinatum Rydb. Sieversia 

 turbinata Greene. S. scapoidea A. Nels. A. arapahoensis Daniels. Moun- 

 tains: Mont. — N.M. — Ariz. — Nev. Mont. — Alp. Je-Au. 



29. FALLUGIA Endl. Apache Plume. 



Low shrub, with straw-colored branches and flaky bark. Leaves pinnately 

 dissected into linear divisions, revolute on the margins, and with small stipules. 

 Flowers solitary or few at the ends of the branches, peduncled. Hypanthium 

 hemispheric, persistent, villous within. Sepals 5, imbricate. Bractlets present. 

 Petals 5, white, rounded, spreading. Stamens numerous, inserted on the margin 

 of the hypanthium in three series. Pistils numerous, villous, on a conic re- 

 ceptacle; stjde terminal; ovules solitary, erect, basal. Fruit of coriaceous, vil- 

 lous, oblong achenes, with (in fruit) elongate, plumose, persistent styles. 



1. F. paradoxa (D. Don) Endl. A shrub 5-10 dm. high, much branched; 

 bark white, in age somewhat shreddy; leaves pinnatifid, with 3-7 linear, revolute 

 divisions, puberulent, villous or in age glabrate, rusty-lepidote beneath, 1-2 cm. 

 long; flowers few, in corymbiform cj'mes; hypanthium hemispheric, 4—5 mm. 

 high, silky-villous; sepals 8-10 mm. long, often rose-tinged, villous; outer ones 

 lanceolate or ovate, long-acuminate-caudate, 3-cleft at the apex, or entire; petals 



18 



