128 FLORA OF PHILADELPHIA. 



2. Asarum reflexum Bieknell. M. p. 349. Rich soil. Along streams. 

 Spring. ,'■,'. 



Delaware— v. P.)- Bucks — Eidge Valley, Rock Hill (Pr.). Lancaster 

 — (P.). Northampton— (P.). , 



2. ARISTOLOCHIA L. 



1. Aristoloohia Serpentaria L. Virginia Snakeroot. M. p. 349. Dry 



woods. Summer. 



2. Aristolochia Clematitis L. Blffhwart. ' M. p. 349. Escaped from 



cultivation. Summer. 



Order 9. POLYGONALES. 

 Family 1. POLYOONACEAE. Buckwheat Family. 



Stigmas tufted. I. Rumex. 



Stigmas capitate. 



Pedicels mostly several together, aehene much, surpassing the calyx 



2. Fagppyrwn. 



Pedicels usually fascicled, aehene mostly enclosed by the enlarged calyx. 



.!■■.' 3. Polygonum. 



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



1. RUMEX L, , Sorrel. Dock. 



Leaves hastate; flowers diceeious, foliage aeid, low species. 



, ,vf ; ..,, 1. R. Acelosella. 



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

 or not at all aeid; tall species. 

 Leaves flat, bright or light green, or glaucescent. 



Tubercles usually 3. 2. R. vertioillatus. 



Tubercle usually 1; pedicels equalling the wings. 



3. R. altissimus. 

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

 Wings entire, 1 more of less undulate. 



Lower leaves narrowed or acuminate at base. 4. R. Britannica. 

 Lower leaves narrowed or acuminate at base. 



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



Tubercle 1; inflorescence not leafy, pedicels short. 



6. R. sanguineus. 

 Wings toothed or fringed. 



Lower leaves cordate. , ,7« R. obtusifolius. 



Lower leaves mostly narrowed at base. ' 8. R, persicarioides. 



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



and hillsides. Summer. 



2. Rumex verticillatus L. Swamp Dock. M. p. 354. Swamps. Summer. 



Delaware — Swarthmore (Ws.). 



Burlington — Medf ord (St.). Cape May — Wildwood {Cr;) (Wn.), 

 Anglesea (Ke.). 



New Castle— Edgemoor, Canby; Cedar Swamp, Commons; Delaware 

 City, etc. 



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



Lav caster— Safe Harbor (P.). 



