120 KEY AND FLORA 



leaflets cut-serrate. Flowers small, in a close, leafy cyme. Styles 

 glandular-thickened at the base. In dry soil. 



3. P. rivalisNutt.,var. millegrana. DIFFUSE CINQUEFOIL. Annual. 

 Stems decumbent or ascending, commonly diffusely branched, 1^-3 

 ft. high, clothed with long, soft hairs or nearly smooth. Leaves all 

 but the uppermost of 3 leaflets and petioled ; leaflets oblong, wedge- 

 shaped, thin, deeply serrate. Flowers yellow, in loose, leafy cymes. 

 Style somewhat thickened below. In damp soil W. 



4. P. argentea L. SILVERY CINQUEFOIL. Stems prostrate or 

 ascending and branching, woolly. Leaflets oblong, wedge-shaped, 

 those of the upper leaves very narrow, with a few large, deeply cut 

 teeth, smooth and green above, silvery beneath, with a dense coat 

 of white wool. Flowers small and somewhat clustered, yellow. Dry 

 fields and roadsides. 



5. P. Anserina L. SILVERWEED. Stems spreading by slender 

 runners, with many joints, silky-hairy. Leaves all basal, pinnate ; 

 leaflets 7-21, serrate, oblanceolate or obovate, nearly smooth above, 

 white and silky-downy beneath. Flowers yellow, i-1 in. in diameter. 

 Style thread-like. River banks, brackish marshes, and borders of lakes. 



6. P. canadensis L. COMMON CINQUEFOIL. Stems slender, pro- 

 cumbent, silky-hairy, sending out long runners. Leaflets obovate, 

 wedge-shaped, appearing like 5 from the divisions of the 2 lateral 

 ones. Peduncles 1-flowered in the axils of the leaves. Flowers 

 yellow. Common in dry pastures and a troublesome weed. 



X. FILIPENDULA Hill. (ULMARIA) - 



Tall perennial herbs. Leaves pinnately divided, with 

 stipules. Flowers small, bisexual, in panicled cymes. Calyx 

 5-lobed. Petals 5, with claws. Stamens many, hypogynous, 

 borne on a flat or slightly hollowed receptacle. Pistils 5-15, 

 distinct. Carpels when ripe 1-2-seeded, looking like follicles 

 but not splitting open. 



1. F. rubra Hill. QUEEN OF THE PRAIRIE. Smooth, branching, 

 2-8 ft. high. Leaves very large, of 3-7 pinnately arranged leaflets, 

 often with smaller ones between, the lobes cut or toothed ; terminal 

 leaflet much larger, 7-9-parted. Flowers showy, pink, fragrant, 

 about | in. in diameter. Meadows and prairies, especially in moist 

 soil, sometimes cultivated. 



2. F. Ulmaria Maxim. MEADOWSWEET. Stem 1-3 ft. high. 

 Leaves lyrate, interruptedly pinnate, white-downy beneath. Flowers 

 yellowish-white, small, fragrant, in a dense compound cyme. Pods 

 spirally twisted. Cultivated from Europe and sometimes escaping. 



