208 FLOBA OF PHILADELPHIA. 



3. Oxalis stricta L. M. p. 576. Woods and fields. Spring to fall. 



4. Oxalis Brittoniab Small. M. p. 577. Woods and fields. Early summer. 



Lancaster— (P.). 

 Mercer — Trenton. 



5. Oxalis rufa Small. M. p. 577. Woods. Spring and summer. 



Bucks — Sellersville ( Fr. ) . 



6. Oxalis cymosa Small. M. p. 577. Woods and fields. Spring to fall. 



Family 3. LINACEAE Dumort. Flax Family. 



1. LINUM L. Flax. 

 Flowers blue. 1. L. usitatissimum. 



Flowers yellow. 



Leaves and bracts entire. 



Stem nearly terete, corymbosely branched; usually only the lowest 

 leaves opposite. 

 Leaves thin, oblong or oblaneeolate, ' spreading: ' ' ' 



2. L. Virginianum. 

 Leaves firm, appressed-ascending. 3. L. medium. 



Stem angled, racemosely branched ; leaves below the branches 

 mostly all opposite. 4. L. striatum. 



Upper leaves and bracts glandular-ciliate. 5. L. sulcatum. 



1. Linum usitatissimum L. Common Fldx. M. p. 578. Roadsides and 



waste places. Summer. 



2. Linum Virginianum L. M. p. 579. Dry woods. Summer. 



3. Linum medium (Planch.) Britton. M, p. 579. Dry soil. Summer. 



Bucks— Perkasie, Three-mile Eun (Ft.). 

 Atlantic — Egg Harbor (Li.). 



4. Linum striatum Walt. M. p. 579. Wet or boggy grounds. Summer. 



Bucks— Eock Hill, TullytOwn, Penn Valley (Fr.), Durham, Buth (Fr.). 

 Montgomery— (P.),. Chester— London Grove (Le.). Lancaster— New 

 Texas (Ca.), Little Britain Twp, (Pr.).. Berks— (P.). Lehigh— Lehigh 

 Mountain, Salsburg (Kr,). Northampton— (P.). Dauphin — (P.). 



New Jersey — Common. 



New Castle — Thompson's, Deringer^s. 



5. Linum sulcatum Eiddell. M. p. 579,. a Dry soil. Summer. ( , 



Bucks— Bristol (B. Sm.). Delaware— Tinicum (B. Sm.). Lehigh— 

 Lehigh Mountain (Kr.). 



Linum terrestris L. Ballast. ' '■ " 



Camden— Camden, C. A. Boiee (B. C). , 



Family 4. ZYGOPHYLLACEAE Lindl. Caltrop Family. 

 1. TEIBULUS L. Caltrop. „ 

 1. Tribulus terrestris L. , M. p. 580, Ballast. Summer. 

 Philadelphia— Philadelphia (Te.). 

 Camden— Camden, C. A. Boice (B. C). 



Family 5. RUTACEAE .tiiss. Rue Family. 



Pistils 2-5, distinct; fruit fleshy, capsular. , 1, Xanthoxylum. 



Pistil 1, 2-celled; fruit a samara. 2. Ptelea. 



