282 



ROSACEAE. 



Vol. II. 



29. DALIBARDA L. Sp. PL 491. 1753. 



A low tufted perennial downy-pubescent herb, with .simple long-petioled ovate-orbicular 

 cordate and crenate leaves, scape-like peduncles bearing i or 2 large perfect white flowers, and 

 short recurved peduncles bearing several or numerous small cleistogamous 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 i8th century.] 



A monotypic genus of northeastern North America. 



I. Dalibarda repens L. Dalibarda. Dew- 

 drop. Fig. 2306. 



Dalibarda repens L. Sp. PI. 491. 1753. 



Ruhus Dalibarda L. Sp, PI, Ed, 2, 708. 1762. 



Dalibarda violaeoides Michx. Fl. Bor. Am, i : 299. 

 1803. 



Stems slender, unarmed, much tufted, several 

 inches long. Leaves pubescent on both sides, 

 9"-2' in diameter, the crenations low, obtuse 

 or sometimes mucronulate; stipules setaceous; 

 flowers 4"-S" broad ; peduncles slender, li'-s' 

 long ; achenes oblong, pointed, slightly curved, 

 minutely roughened, 2" long, rather more than i" 

 in thickness. 



In woods. Nova Scotia to Minnesota, south to 

 Pennsylvania, southern New Jersey, North Carolina, 

 Ohio and Michigan. Plant resembling a low violet. 

 Robin-runaway. June-Sept. 



30. ROSA [Tourn.] L. Sp. PL 491. 1753. 



Erect or climbing shrubs, generally with subterranean rootstocks. Stems commonly 

 prickly. Leaves alternate, odd-pinnate. Stipules adnate to the petiole. Flowers corymbose 

 or solitary, red, pink or white (in our species). Calyx-tube cup-shaped or urn-shaped, con- 

 stricted at the throat, becoming fleshy in fruit, 5- (rarely 4-) lobed, the lobes imbricated, 

 spreading, deciduous or persistent. Petals 5 (rarely 4), spreading. Stamens 00^ inserted on 

 the hollow annular disk. Carpels ^, sessile at the bottom of the calyx; ovaries commonly 

 pubescent ; styles distinct or united. Achenes numerous, enclosed in the berry-like fruiting 

 calyx-tube. Seed pendulous. [The ancient Latin, name of the rose.] 



A large genus, the number of species variously regarded, natives of the northern hemisphere. 

 Besides the following, several others occur in the southern and western parts of North America. 

 Type species : Rosa centifolia L. 



* Styles cohering in a column; leaflets mostly 3. 

 ** Styles all distinct; leaflets 5-11. 



I. R. setigera. 



Leaves deciduous. 



Calyx-lobes persistent, erect on the fruit, or spreading. 

 Infrastipular spines generally none. 



Stems unarmed or nearly so ; calyx-lobes erect on the fruit. 

 Stems armed with numerous prickles. 



Leaflets 3—9, often resinous, obtuse at base ; flowers solitary ; calyx-lobes erect on the 

 fruit. 3. R. acicularis. 



' . Leaflets 7-1 1, not resinous, narrowed at base: flowers corymbed ; calyx-lobes spreading. 



4. R. pratineola. 

 Infrastipular spines commonly present ; stems prickly.. 

 Calyx-lobes entire ; native western species. 



Calyx-lobes, at least the outer ones, deeply incised ; introduced specie 

 Calyx-lobes deciduous, spreading. 



Leaflets finely serrate ; spines stout, recurved. 

 Leaflets coarsely serrate. 



Infrastipular spines slender, nearly straight ; native bushy species. 

 Stems with scattered prickles or naked ; flowers often solitary. 

 Stems very densely prickly ; flowers usually solitary. 

 Infrastipular spines stout, hooked ; introduced wand-like or climbing species. 



10. R. rubiginosa. 

 Leaves evergreen; calyx-lobes persistent. 11. R.braeteata. 



R. blanda. 



R. Woodsii. 

 R. eanina. 



7. R. Carolina. 



R. virginiana. 

 R. nitida. 



