Vox,. II.] 



ROSE FAMILY. 



221 



7. Geum flavum (Porter) Bicknell. Cream-colored Avens. (Fig. 1946.) 



Geum album vxt'.flaz>um Porter, Bull. Torr. Club, 



16: 21. 1889. 

 Geum Canadense var. flavum Britton, Bull. Torr. 



Club, 18: 270. 1891. 

 G.flainim Bicknell, Bull. Torr. Club, 23: 523. 1896. 



Stem bristly-hairy below, erect, iX-3 tal1 - 

 Stipules large, often i' long, foliaceous, dentate 

 orlobed. Basal leaves mostly pinnately divided, 

 sometimes only lobed; lower stem-leaves usually 

 -also pinnately divided, the terminal segment 

 often elongated; upper stem-leaves oval or lan- 

 ceolate, sometimes entire; peduncles slender; 

 flowers cream-yellow, about 3" broad; petals nar- 

 rowly oblong, shorter than or little exceeding the 

 reflexed calyx-lobes; head of fruit sessile, about 

 5" in diameter; receptacle bristly-villous; style 

 nearly glabrous to the base, jointed, 3 // -4 // long. 



In woods, New York to Virginia. June- Aug. 



r Geum urbanum I,., from Europe, distinguished by 

 its bright yellow, broader and longer petals, is es- 

 caped from cultivation at Cambridge, M;iss. 



I 



8. Geum macrophyllum Willd. Large- 

 leaved Avens. (Fig. 1947.) 

 Geum macrophyllum Willd. Enum. 557. 1809. 



Stout, erect, bristly -pubescent, simple or branched 

 above, i-3 high. Stipules broad, foliaceous; basal 

 leavespetioled, lyrate-pinnate, the terminal segment 

 much the largest, reniform, orbicular or cordate, den- 

 tate, 3~7-lobed; lateral leaflets 3-6, oval or obovate, 

 with smaller ones interspersed or borne on the peti- 

 ole; stem-leaves short-petioled or sessile, the leaf- 

 lets or lobes 2-4, cuneate; flowers several, terminal, 

 short-peduncled, yellow, 5 // -io // broad; petals ob- 

 ovate, exceeding the acute reflexed calyx-lobes; 

 receptacle nearly glabrous; style slender, jointed, 

 pubescent, at least below, 3 // -5 // long. 



In low grounds, Nova Scotia and New England to 

 Alaska and British Columbia, south to New York, 

 Missouri, Colorado and Oregon. Also in northern 

 Europe. May-July. 



9. Geum strictum Ait. Yellow Avens. 

 (Fig. 1948.) 



Geum strictum Ait. Hort. Kew. 2: 217. 1789. 

 Geum Canadense Murr. Comm. Goett. 5: 34. pi. 4. f. B. 

 1783. Not Jacq. 1772. 



Erect or ascending, pubescent, branched above, 2-5 

 high. Stipules broad, foliaceous; basal leaves lyrate- 

 pinnate; leaflets 5-7, obovate, cuneate, dentate or lobed, 

 with a few smaller ones interspersed, the terminal one 

 largest, broadly ovate or cuneate; stem-leaves sessile or 

 short-petioled, with 3-5 ovate or oblong acute segments; 

 flowers yellow, similar to those of the preceding spe- 

 cies; receptacle downy-pubescent; style slender, 3"- 

 \" long, jointed, pubescent below. 



In swamps or low grounds, Newfoundland to British 

 Columbia, south to New Jersey, Pennsylvania, Missouri 

 and Arizona. Also in northern Europe and Asia. June- 

 Aug. A hybrid with G. Canadense has been found in 

 eastern Pennsylvania. 



