PLANTS OF SOUTHERN NEW JERSEY. 475 



Along- streams in the Northern and Middle districts. The 

 only Pine Barren stations we have seen are obviously of intro- 

 duced trees. 



Normally a tree of open river valleys, the Buttonwood finds 

 congenial conditions only in the Delaware Valley. 



Fl. — ^Early May to mid-May, when the leaves are partly 

 grown. Fr. — Autumn, persistent, in part, through the winter. 



Middle District. — New Egypt, Swedesboro, Medford (S), introduced about 

 houses at numerous stations in the Pine Barrens and elsewhere, Toms River, 

 Speedwell, etc. 



■ Family ROSACE.E. Roses, etc. 

 Key to the Species. 



a. Flowers yellow. 



b. Leaves digitate, 3-5 foliate. 



c. Flowers cymose, leaflets 3. [Potentilla nionspeliensisY 



cc. Flowers solitary on axillary peduncles. 



d. Earliest flower from node above the first well developed inter- 

 node. P. pumila, p. 482 

 dd. Earliest flower from node above the second or third well 

 developed internode. P. canadensis, p. 482 

 bb. Leaves pinnate. 



c. Flowers 12 mm. broad, in dense cymose inflorescence. 



Drymocallis arguta, p. 481 

 cc. Flowers 3 or 4, remote in a branched inflorescence. 



d. Root leaves, at least some of them, lobed or entire, flowers 

 pale greenish yellow. Gciim flavum, p. 483 



dd. Root leaves all pinnate, flowers golden yellow. 



G. strictum, p. 483 

 ccc. Flowers scattered in a long, slender, spike-like raceme. 



d. Leaflets, exclusive of the small intermediate ones, 5-9 ovate 

 or obovate. 

 e. Root not thickened, leaflets resin — dotted below. 



Agrimonia rostellata, p. 483 

 ee- Root thickened toward the end, leaflets velvety tomentose. 



A. mollis, p. 484 

 dd. Leaflets 11-13, lanceolate. A. parviHora, p. 484 



aa. Flowers pink. 



b. Large, 1.5 in broad or more, leaves pinnate, stem prickly. 

 c. Leaf rachis glabrous or puberulent. 



d. Leaves serrulate, infra-stipular prickles short, 2-4 mm. long, 

 broad-based and decidedly curved, stipules narrowly linear. 



Rosa Carolina, p. 485 



^ Rough Cinquefoil, apparently an introduced weed. 



