VOL. II.] 



ROSE FAMILY. 



205 



17. Rubus Canadensis I,. L,ow Running 

 Blackberry. Dewberry. 

 (Fig. 1906.) 



Rubus Canadensis L. Sp. PI. 494. 1 753- 



Trailing, shrubby, stem often several feet long, 

 armed with scattered prickles or nearly naked. 

 Branches erect or ascending, 4/-i 2' long, more or 

 less pubescent, sometimes prickly, sometimes 

 slightly glandular; leaves petioled, 3-7-foliolate; 

 leaflets ovate, oval or ovate-lanceolate, thin, decid- 

 uous, acute or sometimes obtusish at the apex, 

 rounded or narrowed at the base, sharply dentate- 

 serrate, usually sparingly pubescent; flowers termi- 

 nal, few and racemose, or sometimes solitary, white, 

 about \ f broad; peduncles leafy; sepals shorter than 

 or exceeding the petals; fruit black, delicious, often 

 i' long, less firmly attached to the receptacle than 

 in R. villosus. 



In dry soil, Newfoundland and Ontario to Lake 

 Superior, south to Virginia, Louisiana and the Indian 

 Territory. April-May. Fruit ripe June-July. 



Rubus Canadensis invisus Bailey, Am. Card. 12: 83. 1891. 



Stem stouter than that of the type, often partly ascending; leaflets larger, sometimes 3' long 

 and 2' wide, coarsely dentate with pointed teeth; peduncles elongated, erect; flower-buds conspi- 

 cuously tipped by the connivent ends of the sepals. Central and western New York. The Bartell 

 and Mammoth Dewberries of cultivation. 



Rubus Canadensis roribaccus Bailey, Am. Card. 11:642. 1890. 



Leaflets very large, doubly serrate, incised or lobed; flowers often 2' wide; sepals large and 

 often lobed; fruit larger than that of the type. The Lucretia Dewberry of cultivation. Western 

 New Jersey to Virginia and West Virginia. 



6. DALIBARDA L. Sp. PI. 491. 1753. 



A low tufted perennial 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 i8th century.] 



A monotypic genus of northeastern North America. 



i. Dalibarda repens L. 



(Fig. 1907.) 



Dalibarda. I 



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

 Rubus 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, 

 <)"-2' in diameter, the crenations low, obtuse 

 or sometimes mucronulate; stipules setaceous; 

 flowers 4 // -5 // broad; peduncles slender, \%.'-^ f 

 long; achenes oblong, pointed, slightly curved, 

 minutely roughened, i" long, rather more 

 than l /i' f in thickness. 



In woods, Nova Scotia to Minnesota, south to 

 Pennsylvania, southern New Jersey, Ohio and 

 Michigan. Plant resembling a low violet, and 

 commonly bearing cleistogamous flowers. June- 

 Sept. 



