ROSE FAMILY 423 



in one species reddish, broadly obovate, elliptic, or almost orbicular, obtuse, 

 never emarginate. Stamens about 20, in three series as in Potentilla, closely 

 surrounding the base of the receptacle; filaments short; anthers dehiscent by a 

 longitudinal sht. Receptacle hemispheric or conic, bearing very numerous 

 pistils, in fruit becoming enlarged, very juicy, and delicious in taste. Styles fili- 

 form, but rather short, attached near the middle of the ovaries. Seeds ascend- 

 ing and amphitropous. 



Pubescence of scape and petioles divaricate, i. e., generally spreading at right angles or 



somewhat reflexed (scanty and less spreading in no. 3). j 



Leaflets sessile; achenes superficial on the receptacle. 



Flowers pinkish, nodding from the beginning. ^ 1, F. Helleri. 



Flowers white, erect or spreading, nodding only in fruit. 



Calyx in fruit spreading or ascending; scape generally with long divaricate 



hairs and a leafy bract. 2. F. bracieata. 



Calyx in fruit reflexed; leaflets rhombic-obovate. acute; scape and petioles 

 sparingly hairy; hairs more ascending or appressed. 3. F, americana. 



Leaflets usually petiolulate; achenes set in usuaUy deep pits. 



Plant more or less glaucous; petals usually orbicular and twice as long as the 



sepals . 

 Sepals and bractlets elliptic, 4. F. truncata. 



Sepals and bractlets lanceolate. 



Sepals linear-lanceolate; leaflets cuneate, somewhat coriaceous, sharply 



toothed at the apex. 5. F. cuneifulia. 



Sepals broadly lanceolate; leaflets broadly obovate or broadly cuneate, 



only a little longer than broad, with coarse acute teeth. 



6. F. platypetala. 



Plant not glaucous; petals elliptic, generally exceeding the sepals by one-half, 

 usually over 10 nun. long; achenes set in shallow pits; leaves Arm. 



7. F. grandiflora. 



Pubescence of the scape and petioles appressed or ascending; achenes in pits. 

 Plants not glaucous. 



Leaflets usually more than 3 cm. long, very veiny beneath; runners many. 



8. F. prolifica, — 



Leaflets usually 1-3 cm. long, not very veiny; runners few. 9. F, pumila. 



Plants more or less glaucous. 

 Leaves rather thin. 



Leaflets obovate; scape several-flowered. 10. F. glauca. 



Leaflets oblong-cuneate ; scape 1-4-flowered. 11. F. pauciflora. 



Leaves rather thick, firm; leaflets oblong-cuneate. 12. F. oralis, 



1. F, Helleri Holz. Leaflets rounded-obovate or rhombic-obovate, coarsely 

 serrate, very thin, glabrate above, finely silky beneath; scape 1.5-2 dni. high, 

 often with a foUaceous unifoholate bract; flowers 1.5-2 cm. in diameter; sepals 

 ovate; petals nearly orbicular, twice as long as the sepals. Woods; Ida. — Wash. 

 Submont. Je-Jl. 



2. F. bracteata Heller. Leaflets broadly rhombic-obovate, acute, coarsely 

 toothed, 2-5 cm. long, very thin, somewhat glaucous, silky when young, glabrate 

 in age; scape often over 1 dm, high, often exceeding the leaves, 2-8-flowered; 

 flowers 1,5-2 cm. in diameter; sepals and bracts lanceolate, acute; petals rounded- 

 obovate, often nearly twuce the length of the sepals; fruit ovoid or semi-ellipsoid, 

 red, about 7.5 mm. in diameter and 10 mm. long. Fragaria retrorsa Greene. 

 Woods: B.C.— Calif.— N.M,— Mont. Submont.Subalp. My-S. 



3. F. americana (Porter) Britton. Leaflets 3-8 cm. long, rhombic-obovate, 

 mostly acute, sharply and deeply serrate, very thin, very soon glabrate on both 

 sides; scape slender, seldom over 1.5 dm. high, seldom much exceeding the leaves, 

 very rarely leafy-bracteate; fruit elongate-ovoid, 5-7.5 mm. in diameter and 

 1-1.5 cm. long. Fragaria vesca americana Porter. Woods: Newf. — Man. — 

 N.M.— Va. Submont.^MonL Je-Au. 



4. F. truncata Rydb. Leaflets petiolulate, 1.5-4 cm. long, rounded- 

 obovate, round-crenate above the middle, with the middle tooth smaller, thin, 

 silky on both sides, but in age glabrate above; scape slender, few-flowered, sel- 

 dom exceeding 1 dm. in height, and rarely leafy-bracteate; flowers 1-2 cm. in 

 diameter; bractlets and sepals elliptic or ovate, obtuse or acutish; petals obovate, 

 exceeding the sepals by about a third. Mountains: Cahf. — Nev. — Ida. Sub- 

 mouL Je, 



5. F. cuneifolia Nutt. Leaflets cimeate to obovate, obtuse or truncate, 

 toothed onlv at the aoex, 1.5-4 cm. lonsr. firm and somewhat coriaceous, silky 



