POLYGON ACE AK. 129 



4. RuMEX Britannica L. M. p. 356. Wet places. Summer. 



Lancaster— York Furnace (Cr.) (Mac). 



Cape May— Anglesesi (He.) (Li.). Hunterdon — Near Rosemont (C). 



5. RuMEX CRiSPUS L. Curled Dock. M. p. 356. Cultivated and waste 



grounds. Summer. 



6. RUMEX SANGUINEUS L. M. p. 356. Waste places. Summer. 



Bttcfcs— Near Sellersville (Fr.), Rockfield (P.). Lefei^/i— Saegersville 

 (Kr.). Camden — Ancora (Gi.). 



7. RuMEX OBTUSiFOLius L. Bitter Bock. M. p. 357. Waste places. Summer. 



8. RuMEX PERSiCARioiDE.s L. Golden Docl:. M. p. 357. Sandy shores. 



Summer. 

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



RuMEX CONGLOMERATUS Murr. Waste places. Summer. 



Camden — Wharf at Camden (Li.). 

 RUMEX MARITIMUS L. Golden Dock. 



Philadelphia— Old Navy Yard, I. Burk (He.). Camden— 

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



2. FAGOPYRUM L. 

 1. Fagopyrum Fagopyrum (L.) Karst. 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. 

 Racemes solitary or 2 ; aquatic or swamp species ; perennials. 

 Leaves oblong, elliptic, or elliptic-lanceolate, not acuminate. 



1. P. amphibium. 

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



2. P. emersum. 

 Racemes several or numerous; annuals or perennials mostly terrestrial. 



Ocreae naked or ciliolate, their limbs not spreading. 

 Racemes drooping. 



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



3. P. incarnatum. 

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



middle. 4. P. lapathifoUum. 



Racemes erect. 5. P. Pennsylvanicvm. 



Ocreae fringed with bristles, their limbs not spreading. 



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



6. P. Persicaria. 

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

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



8. P. hydropiperoides. 

 Racemes interrupted, erect or drooping. 



Achene granular and dull ; racemes drooping. 



9. P. Hydropiper. 

 Achene smooth, shining; racemes erect. 



10. P. punctatum. 

 Ocreae fringed with bristles, their limbs normally spreading. 



11. P. orientale. 



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

 parted. 12. P. Virginianum. 



