6o Introduction to Botany. 



V. FRAGARIA. Strawbeny. 



(L , /raga, strawberry.) 



Acaulescent, perennial herbs, propagating by runners. Leaves 

 3-foliate, basal, and tufted, on long petioles with a sheathing mem- 

 branous stipule. Flowers on erect, naked scapes, corymbose or 

 racemose, polygamo-dioecious. Sepals 5-bracteolate, persistent, deeply 

 5-lobed. Petals 5, obovate, clawed, white. Stamens numerous. Car- 

 pels numerous, on an elongated receptacle which becomes fleshy and 

 edible in fruit; carpels becoming dry achenes. 



I. Fragaria Virginiana, Duchesne. VIRGINIA or SCARLET STRAWBERRY. 

 Leaflets thick, broadly oval or obovate; petioles 2 to 6 inches long; inclined to be 

 villous-pubescent with spreading or appressed hairs. Fruit ovoid, red, the achenes 

 imbedded in pits. Scape shorter than the leaves. In fields or woodlands. 



i!. Fragaria v^sca, L. (L.^j-ckj-, small or thin.) EUROPEAN WOOD Straw- 

 berry. Leaflets thiclc, broadly oval or ovate, usually not so villous as the pre- 

 ceding. Scapes longer than the leaves, and the fruit lifted above them. Fruit 

 hemispheric or conic, red, achenes not imbedded in pils. Fields and rocky places. 



VI. POTENTILLA. Cinquefoil or Five-finger. 

 iX'.jpotens, powerful, from reputed medicinal value of one of the species.) 



Herbs, rarely shrubs. Leaves digitately or pinnately compound, 

 alternate, stipulate. Flowers perfect, cymose or solitary. Calyx usually 

 5-lobed, subtended by as many bractlets. Petals mostly 5. often emar- 

 ginate, yellow, white, or purple. Stamens usually many, sometimes 5-10. 

 Carpels numerous, on a dry receptacle which is often hair)-. 



1. Potentilla arguta, Pursli. (L., argutus, sharp, pungent.) Tall or Glandu- 

 lar Cinquefoil. Flowers white, cymose. Stout and erect, i to 4 feet high. 

 Basal leaves with 7-11 leaflets, long-petioled. Stem leaves shorter with fewer leaflets. 

 Leaflets cut-serrate. Flowers white, about \ inch broad, in terminal cymes. Plant 

 glandular-pubescent. 



2. Potentilla argentea, L. (T^., argenteus, silvery.) SILVERY or HOARY 

 Cinquefoil. Flowers yellow, cymose. Stems ascending, tufied, 4 to 12 inches 

 long, white from woolly pubescence. Leaves digitately s-foliate, the divisions 

 lanciniate beyond the middle, green above, white beneath. In dry soil. 



3. Potentilla Norvegica, L. Rough Cinquefoil. Flowers yellow in termi- 

 nal cymes. Erect and stout annuals or biennials with rough pubescence, 6 inches 

 to 2 feet or more high. Leaves 3-foliate, the lower petioled, upper stem leaves 

 nearly or' quite sessile. Leaflets obovate to oblong-lanceolate. Styles glandular- 

 thickened at the base. In dry soil. 



4. Potentilla leucocarpa, Rydberg. (Gr., leukos, white ; karpos, fruit.) DiF- 



