128 FLORA OF PHILADKLFHIA. 



2. AsARUM REFLEXUM Bicknell. M. p. 349. Rich soil. Along streams. 

 Spring. 

 Delaware— [^F.). Bucks— Bidge Valley, Rock Hill (Fr.). Lancaster 

 — (P.). Northampton— (P.). 



2. ARISTOLOCHIA L. 



1. Aristolochia Serpentaria L. Virginia Snalceroot. M. p. 349. Dry 



woods. Summer. 



2. Aristolochia Clematitis L. Birthwort. M. p. 349. Escaped from 



cultivation. Summer. 



Order 9. POLYGONALES. 

 Family]. POLYGONACEAE. Buckwheat Family. 



Stigmas tufted. I. Bumex. 



Stigmas capitate. 



Pedicels mostly several together, achene much surpassing the calyx 



2. Fagopyrum. 

 Pedicels usually fascicled, achene mostly enclosed by the enlarged calyx, 



3. Polygonum. 

 Pedicels solitary; leaves jointed at base. 4. Polygonella. 



1. RUMEX L. Sorrel. Dock. 



Leaves hastate; flowers dioecious, foliage acid, low species. 



1. B. Acetosella. 

 Leaves not hastate; flowers perfect or polygamo-dicecious ; foliage scarcely 

 or not at all acid; tall species. 

 Leaves flat, bright or light green, or glaucescent. 



Tubercles usually 3. 2. B. verticillatus. 



Tubercle usually 1; pedicels equalling the wings. 



3. B. altissimus. 

 Leaves wavy-margined or crisped, dark green, not glaucescent. 

 Wings entire, more or less undulate. 



Lower leaves narrowed or acuminate at base. 4. B. Britanniva. 

 Lower leaves narrowed or acvuninate at base. 



Tubercles mostly 3, pedicels long. 5. B. crispus. 



Tubercle 1 ; inflorescence not leafy, pedicels short. 



6. B. sanguineus. 

 Wings toothed or fringed. 



Lower leaves cordate. 7. B. obtusifolius. 



Lower leaves mostly narrowed at base. 8. B. persicarioides. 



1. Rumex Acetosella L, Field or Sheep Sorrel. M. p. 354. Dry fields 



and hillsides. Summer. 



2. Rumex verticillatus L. Swaanp Dock. M. p. 354. Swamps. Summer, 



Delaware— Swarthmore (Ws.). 



Burlington — Medf Old (St.). Cape May — Wildwood (Cr.) (Wn.), 

 Anglesea (Ke.). 



New Castle— ^dgemooT, Canby; Cedar Swamp, Commons; Delaware 

 City, etc. 



3. Rumex altissimus Wood. M. p. 355. Moist grounds. Spring. 



Lancaster — Safe Harbor (P.). 



