200 Class XII. Order V. 



Stem prickly, erect ; leaves ternate or quinate ; pu- 

 bescence simple ; racemes leafy, about ten flowered ; 

 petals orbicular. 



Stem erect, reddish, armed with straightish or slightly recurv- 

 ed prickles. Young branches covered with simple pubescence, 

 and ending in leafj racemes. Leaves on short peduncles, mostly 

 ternate, the lower ones sometimes five digitate, and upper ones 

 simple ; leafets ovate, unequally serrate, pubescent beneath, 

 nearly glabrous above, the lateral ones sessile, the terminal one 

 on a short stalk. Racemes leafy, having a leaf at the base of 

 most of the pedicels, about ten flowered, the upper flowers ex- 

 panding first. Calyx segments ovate, acuminate. Petals or- 

 bicular, ovate, large, white. - Fruit black, agreeable. 



Approaches R. villosus, and has probably been confounded 

 with it, but differs in the following marks, as well as in its habit, 

 by which it may be distinguished at sight. 



7?. villosus. R.frondosus. 



Pubescence glandular. 



Racemes nearly naked, about 

 twenty flowered, the lower 

 flowers opening first. 



Petals lance-ovate with wide 

 intervals when expanded. 



Pubescence simple. 



Racemes leafy, about ten flow- 

 ered, the terminal flowers 

 opening first. 



Petals orbicular-ovate, much 

 larger, and nearly in contact 



with each other when ex- 

 panded. 



Besides the above marks, R. frondosus is smoother, leave.* 

 more flat, and the terminal leafet on a longer stalk. Road sides 

 in Roxbury. May, June. 



First observed by my pupil, Mr. H. Little. 



RUBUS TRIVIALIS. Mich. Low or running Blackberry. Dew- 

 berry. 



Stems procumbent ; leafets three or five, oval, ser- 

 rate, nearly smooth ; flower stalks mostly solitary. 



Syn. RUBUS PSOCUMBENS. Muhl. 



Stems prickly, slender, flexible, running several yards upon 

 the ground, but seldom putting out roots, unless accidentally 

 covered. Leaves nearly smooth, green on both sid.es. Pedun- 

 cles long, slender, mostly undivided, furnished with minute 



