Genus 15. 



ROSE FAMILY. 



263 



I. Drymocallis agrimonioides ( Pursli ) Rydb. Tall or Glandular Cinquefoil. 



Fig. 2260. 



Ceiim agrimonioides Pursh. FI. Am. Sept. 351. 



1814. 

 Potcntilla arguta Pursh, FI. Am. Sept. 736. 1S14. 

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



368. 1908. 



Erect, stout, simple or little-branched above, 

 glandular and villous-pubescent, i-4 high. 

 Stipules membranous ; basal leaves slender- 

 petioled, pinnately 7-11-foliolate ; leaflets ovate, 

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

 minal one cuneate, the others rounded at the 

 base and common]}' oblique, all sharply incised- 

 dentate; stem-leaves short-petioled or sessile, 

 with fewer leaflets; flowers white, densely 

 cymose, terminal, numerous, short-pedicelled, 

 5"-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. 



16. CHAMAERHODOS Bunge, in Ledeb. FI. 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. crccta Niitlallii T. & G. FI. N. A. i : 433. 1840. 



C. Nutlallii Pickering; Rydb. N. Am. FI. 22: 377. 1908. 



Hirsute, glandular, leafy, erect, branched, 1 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"-i4" 

 broad, hispid, the segments narrowly lanceolate, 

 equalling or somewhat shorter than the white petals. 



Plains and prairies, Minnesota to Saskatchewan, 

 Alaska and Wyoming. June-.'\ug. 



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-S-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. 



