POLYGONACEAE. 129 



. 4. Bumex Britannioa L. M. p. 356. Wet places. Summer. 

 Lancaster— York Furnace (Cr.) (Mac). 

 Cape May— Anglesea (He.) (Li.). Hunterdon— Near Bosemont (0.). 



3. Bumex crispus L. Curled Bock. M. p. 356. Cultivated and waste 

 grounds. Summer. 



fi. Bumex sanguineus X. M. p. 356. Waste places. Summer. 



Bucks— Near Sellersville (Fr.), Bockfield (P.). LeTwgrft^Saegersville 

 (Kr.). Camden— Ancbra (Gi.). 



7. Bumex obtusipolius L. Bitter Dock. M. p. 357. Waste places. Summer. 



8. Bumex persicarioides L. Golden, Dock. M. p. 357. Sandy shores. 



Summer. 

 Delaware— Along the Delaware, Dr. Geo. Smith (B. Sm.). 



Bumex conglomeratus Murr. Waste places. Summer. 



Camden— Wharf at Camden (Li.). 

 Bumex maritim us L. Golden Dock. 



Philadelphia— 0\A Navy Yard, I. Bwk (He.). Camden— 

 Ballast ,(C). Ocean and Monmouth — Salt marshes (C). 



2. FAGOPYEUM L. 

 1. Fagopyrum Fagopyrum (L.) Karat. Buckwheat. M. p. 358. Waste 

 places. Summer. 



3. POLYGONUM, L. Smartweed, Knotweed. 

 1. Flowers in terminal spike-like racemes; calyx 5-cleft or 5-parted; stem 

 not twining; 

 Bacemes (Solitary, or ,2'; aquatic or swamp species; perennials. 

 Leaves oblong, elliptic, or ^elliptic-lanceolate, no * acuminate. 



1. P. amphibi/wm. 

 Leaves ovate-lanceolate, or oblong-lanceolate, usually acuminate. 



2. P. emersum. 

 Bacemes several or numerous; annuals or perennials mostly terrestrial. 



Ocreae naked or ciliolate, their limbs not spreading. 

 Bacemes drooping. 



Achene ovoid; style 2-parted to near the base. 



■ . 3. P. incarnatvm. 

 Achene broadly oblpng-ovoid, style 2-cleft to below the 

 middle. 4. P. lapathifoUum. 



Bacemes erect. 5. P. Pennsylvdnioum. 



Ocreae fringed with bristles, their limbs not spreading. 



Bacemes not interrupted, erect, achene lenticular or 3-angled. 



6. P. Persicaria. 

 Bacemes not interrupted, drooping. 7. P. Careyi. 

 Bacemes not interrupted, erect; achene always 3-angled. 



8. P. hydropiperoide*. 

 Bacemes interrupted, erect or drooping. 



Achene granular a"nd dull; racemes drooping. 



9. P. Bydropiper. 

 Achene smooth, shining; racemes erect. 



10. P. punctatum. 

 Ocreae fringed with bristles, their limbs normally spreading. 



11. P. orientals. 



2. Flowers in long, naked, much-interrupted, spike-like racemes; calyx 4- 

 parted. ' 12. P. Virginianum. 



