208 FLORA OF PHILADELPHIA. 



3. OxALis STRICTA L. M. p. 576. Woods and fields. Spring to fall. 



4. OxALis Brittoniae Small. M. p. -577. Woods and fields. Early summer. 



Lancaster — (P.) . 

 Mercer — Trenton. 



5. OxALis RUFA Small. M. p. 577. Woods. Spring and summer. 



B«cA;s— 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 oblanceolate, spreading. 



2. L. Virginiayium. 

 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. Commov Flax. 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 Run (Fr.). 

 Atlantic — Egg Harbor (Li.). 



4. LiNUM STRIATUM Walt. M. p. 579. Wet or boggy grounds. Summer. 



BucJis— Bock Hill, Tullytown, Penn Valley (Fr.), Durham, Euth (Fr.). 

 Montgomery— (P.). Chester— Jjondon Grove (Le.). Lancaster— New 

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

 Mountain, Salsburg (Kr.). Northampton— (P.). Dauphi7i—{P.). 



New Jersey — Common. 



New CasiZe— Thompson's, Deringer 's. 



5. LiNUM SULCATUM Riddell. M. p. 579. Dry soil. Summer. 



BwcA's— Bristol (B. Sm.). Delaware— Tinicum (B. Sm.). Lehigh — 

 Lehigh Mountain (Kr.). 



LiNUM TERRKSTRis L. Ballast. 



Com den— Camden, C. A. Boice (B. C). 



Family 4. ZYGOPHYLLACEAE Lindl. Caltrop Family. 

 1. TRIBULUS L. Caltrop. 

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

 Philadelphia— Phi\ade\Tphia (Te.). 

 Camden— Camden, C. A. Boice (B. C). 



Family 5. RUTACEAE Juss. Rue Family. 



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



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



