GENUS 15. 



ROSE FAMILY. 



263 



i. Drymocallis agrimonioides (Pursh) Rydb. 



Fig. 2260. 



Geum agrimonioides Pursh. Fl. Am. Sept. 351. 



1814. 



Potentilla arguta Pursh, Fl. Am. Sept. 736. 1814. 

 Drymocallis agrimonioides Rydb. N. A. Fl. 22 : 



368. 1908. 



Erect, stout,- simple or little-branched above, 

 glandular and villous-pubescent, i-4 high. 

 Stipules membranous; basal leaves slender- 

 petioled, pinnately 7-u-foliolate; leaflets ovate, 

 oval or rhomboid, obtuse at the apex, the ter- 

 minal one cuneate, the others rounded at the 

 base and commonly oblique, all sharply incised- 

 dentate; stem-leaves short-petioled or sessile, 

 with fewer leaflets ; flowers white, densely 

 cymose, terminal, numerous, short-pedicelled, 

 S"-7" broad; calyx-lobes ovate, acute, shorter 

 than the obovate petals ; stamens 25-30, borne 

 on the glandular disk ; style nearly basal and 

 fusiform-thickened ; achenes glabrous. 



On dry or rocky hills, New Brunswick to 

 Mackenzie, south to Virginia, Illinois, Kansas and 

 Colorado. June-July. 



Tall or Glandular Cinquefoil. 



16. CHAMAERHODOS Bunge, in Ledeb. Fl. Alt. i : 429. 1829. 



Perennial or biennial herbs, with ternately divided leaves, and small perfect cymose 

 flowers. Calyx ebracteolate, small, 5-cleft. Petals obovate or cuneate, somewhat clawed. 

 Stamens 5, opposite the calyx-segments; filaments short, subulate, persistent. Pistils 5-20; 

 style filiform, basal. Seed ascending, attached near the base of the style. [Greek, a low rose.] 



About 3 species, natives of North America and Asia. Type species : Chamaerhodos altaica 

 (L.) Bunge. 



i. Chamaerhodos Nuttallii (T. & G.) Pick- 

 ering. American Chamaerhodos. Fig. 2261. 



C. erecta Nuttallii T. & G. Fl. N. A. 1 : 433. 1840. 



C. Nuttallii Pickering; Rydb. N. Am. Fl. 22: 377. 1908. 



Hirsute, glandular, leafy, erect, branched, i high 

 or less. Basal leaves 2-4-ternately divided into 

 linear or oblong segments, those of the stem similar, 

 but smaller and less divided; cymes numerous, pan- 

 icled, the panicle-branches ascending; pedicels nearly 

 erect, not longer than the flowers; calyx-tube i"-ii" 

 broad, hispid, the segments narrowly lanceolate, 

 equalling or somewhat shorter than the white petals. 



Plains and prairies, Minnesota to Saskatchewan, 

 Alaska and Wyoming. June-Aug. 



17. ALCHEMILLA L. Sp. PI. 123. 1753. 



Perennial herbs, with basal and alternate lobed or digitately compound leaves, adnate 

 stipules, and small perfect greenish cymose or capitate flowers. Calyx persistent, cup-shaped, 

 contracted at the throat, 4-5-lobed, 4~5-bracteolate. Petals none. Stamens 4, alternate with 

 the sepals ; filaments short. Carpel usually solitary ; style basal, slender. Achene enclosed in 

 the calyx-tube. Seed ascending, its testa membranous. [Name from its fancied value in 

 alchemy.] 



About 10 species, natives of the Old World and of boreal America. Type species: Alchemilla 

 vulgaris L. 



