208 ROSACEAE. [Vol.. II. 



i. Duchesnea Indica (Andr.) Focke. Yellow 

 or Indian Strawberry. (Fig. 1912.) 



Fragaria Indica Andr. Bot. Rep. pi. 479. 1807. 

 Duchesnea Indica Focke, in Engl. & Prantl, Nat. Pfl. Fam. 3: 

 abt 3, 33. 1888. 



Silky-pubescent, tufted and forming leafy runners, 

 dark green. Leaflets obovate or broadly oval, rather 

 thin, crenate or dentate, obtuse at the apex, rounded or 

 narrowed at the base, the terminal one generally cuneate; 

 peduncles equalling or longer than the leaves; flowers 6"- 

 12" broad; bractlets of the calyx dentate or incised, ex- 

 ceeding the ovate or lanceolate acuminate spreading 

 calyx-lobes; fruit red, ovoid or globose, insipid. 



In waste places, southern New York and Pennsylvania to 

 Florida and Georgia. Naturalized or adventive from India. 

 April-July. 



9. POTENTILLA L. Sp. PI. 495. 1753.* 



Herbs or shrubs, with alternate stipulate digitately or pinnately compound leaves, and 

 cymose or solitary yellow white or purple perfect flowers. Calyx persistent, its tube concave 

 or hemispheric, 5-bracteolate (rarely 4-bracteolate), s-lobed (rarely 4-lobed). Petals 5 or 

 rarely 4, mostly obovate or orbicular, usually etnarginate. Stamens oo , seldom 5 or 10; 

 filaments slender; anthers small. Carpels oo, numerous, inserted on a dry, usually pubescent 

 receptacle; style terminal, basal or lateral, deciduous. Seed pendulous or ascending. [Di- 

 minutive of polens, powerful, from the medicinal properties of some species.] 



About 150 species, nearly all of them natives of the north temperate zone. Besides the follow- 

 ing about 30 others occur in the western and northwestern parts of North America. 

 Flowers cymose, white; leaves pinnate; erect herb. i. /'. arguta. 



Flowers cymose, yellow; erect or ascending herbs. 



Leaves digitately 3-7-foliolate; leaflets dentate or incised. 

 Leaflets 5-7. 



Leaves white-pubescent beneath. 

 Leaves green beneath. 



Plant 3' -6' high; leaflets obovate, 6"-8" long; arctic. 

 Plants i-2 high; leaflets 1'-$' long; introduced species. 

 Leaflets obovate ; flowers 3"-4 broad. 

 Leaflets oblanceolate ; flowers 6" -9" broad. 

 Leaflets 3 (or apparently 5 in no. n ). 



Styles filiform; plants arctic or alpine. 

 Leaves white-pubescent beneath. 

 Leaves green beneath, often villous. 

 Flowers 5"-j" broad. 



Teeth of the leaflets acute ; bractlets oblong. 

 Teeth of the leaflets obtuse; bractlets oval. 

 Flowers only 3" broad. 

 Styles glandular-thickened below. 



Plants stout, erect, rough-pubescent. 

 Stamens about 20. 

 St.unens 5-8; prairie species. 

 Plant slender, often diffuse, villous. 

 Leaves pinnately 3-n-foliolate. 



Leaves villous, or softly pubescent, rarely glabrate. 



All 7-1 1 -foliolate; inflorescence cymose. 13. P. paradoxa. 



Upper leaves 3-foliolate; inflorescence falsely racemose. 14. P. Nicolletii. 



Leaves white-tomentose on both sides. 



Leaves mostly regularly pinnate; pubescence silky and tomentose. 15. P. Hippiana. 

 Leaves mostly interruptedly pinnate; pubescence simply tomentose. 16. P. effusa. 

 Leaves green above, white-tomentose beneath; leaflets pinnatifid. 

 Styles thickened at the base. 



Plant erect; leaves 7-i5-foliolate. 17. P. Pennsylvania. 



Plant ascending or decumbent; leaves 5-7-foliolate, the leaflets approximate, or al- 

 most digitate. 18. P. littoralis. 

 Styles not thickened : plant low, spreading; leaves 6-9- foliolate. 19. P. mullifida. 

 Flowers cymose or solitary, yellow; shrub with pinnate leaves. 20. P. frulicosa. 

 Flowers cymose, white; plant low, shrubby; leaves 3-foliolate. 21. P. Iridentata. 

 Flowers solitary, axillary, yellow; creeping or ascending herbs. 



Leaves pinnate; leaflets 5-25, white- pubescent beneath. 22. P. Anserina. 



Leaves digitate; leaflets 5-3, pubescent or glabrate. 



Leaflets 5, rarely 3; petals and sepals 5. 23. P. Canadensis. 



Leaflets 3, rarely 5; petals and sepals 4, rarely 5. 24. P. nemoralis. 



* Text revised by Mr. PER AXEL RVDBERG. 



2. P. argentea. 



3. P. rubens. 



4. P. intermedia. 



5. P. recta. 



6. P. nivea. 



P. emarginata. 



P. nana. 



P. Robbinsiana. 



10. P. Monspeliensis, 



11. P. pentandra. 



i.'. /'. leucocarpa. 



