ROSACEAE. 499 



composed of few drupelets. In swamps or low grounds, rarely in dry soil, N. S. 

 to Out., Minn., Ga. and Kans. June -July. 



7. DALIBARDA L. 



A low tufted perenii al downy- pubescent herb, with simple long-petioled ovate- 

 orbicular cordate and crenate leaves, and scape-like peduncles bearing I or 2 white 

 flowers. Calyx deeply 5-6-parted, its divisions somewhat unequal, the 3 larger 

 ones commonly toothed. Petals 5, sessile, soon deciduous. Stamens numerous. 

 Pistils 5-10; style terminal. Drupelets 5-10, nearly dry, enclosed at length in 

 the connivent calyx-segments. [Named in honor of Thos. Fran. Dalibard, a 

 French botanist of the eighteenth century.] A monotypic genus of northeastern 

 North America. 



i. Dalibarda repens L. DALIBARDA. (I. F. f. 1907.) Plant commonly 

 bearing cleistogamous flowers. Stems slender, unarmed, much tufted, several 

 inches long ; leaves pubescent on both sides, 2-5 cm. in diameter, the crenations 

 low, obtuse or sometimes mucronulate; stipules setaceous; flowers 8-iomm. broad; 

 peduncles slender, 4-12 cm. long; drupelets oblong, pointed, slightly curved, 

 minutely roughened. In woods, N. S. to Minn., south to southern N. J., Ohio 

 and Mich. June-Sept. 



8. DRYMOCALLIS Fourr. 



Perennial, more or less glandular or viscid, erect herbs with pinnate leaves. 

 Flowers irregularly cymose; calyx 5-bracteate; sepals 5; petals 5, obovate, elliptic 

 or orbicular, not emarginate, yellow or white. Stamens 20-30, in five festoons on 

 the much thickened margins of the pentagonal disk around the receptacle; anthers 

 flattened. Receptacle hemispheric with numerous pistils; style nearly basal and 

 generally thickened near the middle; seed attached near the base of the style, as- 

 cending, orthotropous. A genus of 18 or 20 species of the north temperate zone; 

 of these 13 are found in America. 



i. Drymocallis arguta (Pursh) Rydb. TALL, OR GLANDULAR CINQUE- 

 FOIL. (I. F. f. 1913.) Erect, stout, glandular and villous-pubes-cent, 3-10 dm. 

 high. Basal leaves pinnately 7-ii-foliolate; leaflets ovate, oval or rhomboid, ob- 

 tuse at the apex, the terminal one cuneate, the others rounded at the base and com- 

 monly oblique, all sharply incised-serrate ; stem-leaves short-petioled Or sessile, 

 with fewer leaflets; flowers white, densely cymose, 10-18 mm. broad; calyx-lobes 

 ovate, acute, shorter than the obovate petals; stamens 25-30. [Potentil/a arguta 

 Pursh.] On dry or rocky hills, N. B. to the Rocky Mts., south to Tenn. and Kans. 

 June-July. 



9. DASIPHORA Raf. 



Shrubs with scarious sheathing stipules and pinnate leaves. Flowers solitary or 

 in small cymes; bractlets, sepals and petals 5. Petals orbicular, not emarginate, in 

 ours yellow. Stamens about 25, in 5 festoons on a disk as in Drymocallis ; style 

 lateral, club-shaped, thick and glandular above; stigma four-lobed. Achenes nu- 

 merous, densely covered with long straight hairs; seed ascending and amphitro- 

 pous. A genus of 8 or 9 species, all Asiatic, but the following also natives of North 

 America and Western Europe. 



T. Dasiphora fruticosa (L.) Rydb. SHRUBBY CINQUEFOIL. (I. F. f. 1932.) 

 Shrubby, much branched; stems erect or ascending, very leafy, 1.5-12 dm. high, the 

 bark shreddy. Leaflets 5-7, oblong, entire, acute or acutish at each end, 1-2 cm. 

 long, silky-pubescent, the margins revolute; flowers bright yellow. 1.5-3 cm. broad; 

 calyx-lobes ovate; bractlets oblong. \Potentillafruticosa L.] In swamps or moist 

 rocky places. Lab. and Greenland to Alaska, N. J., Ariz, and Cal. Also in 

 Europe and Asia. June-Sept. 



Dasiphora fruticosa tenuifblia (Willd.) Rydb. Leaflets linear-oblong, more revolute; 

 shrub lower and more hairy. On high mountains among exposed rocks. Range of the 

 species. 



10. SIBBALDIOPSIS Rydb. 



A low undershrub, with trifoliolate subcoriaceous leaves and white cymose 

 flowers, Bractlets- and sepals 5. Petals 5, obovate or broadly oval, not emargi. 



