PLANTS OF SOUTHERN NEW JERSEY. 419 



Not very plentiful, and locally distributed in the Northern and 

 Middle districts and rarely in the Cape May peninsula. 



PL — Early June to early July. Fr. — Late July to late August. 



Middle District.— KeypoTt (C), Holmdel (C), Haddonfield, Medford, Man- 

 tua, MulHca Hill (H), Malaga (S), Swedesboro, Riddleton, Locust Grove. 

 Cape Ma^;.— Cold Spring (OHB). 



Order POLYQONALES. 



Family POLYGONACE^. Buckwheats, Smartweeds, etc. 



a. Calyx of six parts, the three inner ones often developing into wings, one 

 or all of them bearing a tubercle. 

 b. Leaves hastate, flowers dioeceous, plants not over 4 dm. high. 



c. Inner sepals not developing wings. [R. acetosella]* 



cc. Inner sepals developing wings. R. hastatulus, p. 421 



bb. Leaves not hastate, flowers perfect, tall plants. 



c. Leaves flat, edges not crisped, pedicels clavate. 



R. verticillatus, p. 421 

 cc. Leaves crisped on the edges. 



d. Wings of fruiting calyx entire, somewhat undulate. 



[R. crispus]* 

 dd. Wings of fruiting calyx toothed or fringed. 



[R. obtusifolitis]* 



aa. Calyx five parted, leaves very slender linear, or almost filiform, pedicils 



solitary. Polygonella, p. 427 



aaa. Calyx four or five parted, leaves not filiform, pedicels usually in fascicles. 



b. Flowers in terminal spike-like racemes, calyx five parted. 



c. Raceme solitary or two, aquatic plants. Polygonum emerstim, p. 421 

 cc. Racemes several or numerous. 



d. Ocreae (sheathing the joints) naked or ciliolate. 



e. Racemes drooping. [P. lapathifoliuui\'\ 



ee. Racemes erect. 



f. Stem glandular below the inflorescence. 



P. pennsylvanicuni, p. 422 

 ff. Stem glabrous below the inflorescence. 



P. eciliatum, p. 423 

 dd. Ocrese fringed with bristles. 



e. Racemes dense, not interrupted. 

 f. Racemes erect. 



g. Leaves 65 x 12 mm., bristles 3 mm. long, flowers 

 deep red, in waste ground. [P. persicaria]t 



gg. Leaves 35 x 10 mm., bristles 6 mm. long, flowers 

 white, usually strongh'^ tinged with pink. 



* R. crispus Yellow Dock, R. obtusifolius Bitter Dock, R. acetosella Horse 

 Sorrel, common weeds about cultivated and waste ground, 

 t Dock-leaved Smartweed, apparently always an introduced weed. 

 t Lady's Thumb. 



