160 FLORA OF PHILADELPHIA. 



5. SISYMBRIUM L. Hedge Mustakd. 



Flowers yellow; pods 1-1.5 cm. long, appressed. 1. S. officinale. 



Flowers cream-color; pods 5-10 cm. long, divergent. 2. 8. altissimum. 



1. Sisymbrium officinale (L.) Scop. M. p. 448. Waste places. Summer. 



2. Sisymbrium altissimum L. M. p. 448. Ballast. Summer. 



Philadelphia— Girard Point (Ja.), Neck (VP.). 5«cfcs— Sellers ville 

 (Fr.). Northampton— Bethlehem (P.). Delaware— 'Ridley (B. Sm,). 



6. CAKILE Gaertu. 

 1. Cakile edentula (Bigel) Hook. American Sea-rocket. M. p. 448. Sea- 

 coast; also ballast. Summer. 

 New Jersey — Seacoast, common. Camden — Kaighn 's Point (Wn.). 



7. SINAPIS L. 

 1. SiNAPis ALBA L. White Mustard. M. p. 449. Fields and waste places. 

 Summer. 



8. BRASSICA L. 



None of the leaves clasping the stem, the upper sessile. 



Pods slender, 1-2.5 cm. long, appressed. 1. B. nigra. 



Pods rather slender, 2-5 cm. long, erect, not appressed, on slender pedi- 

 cels 6-10 mm. long. 2. B. juncea. 

 Pods spreading or ascending at maturity, on stout pedicels 4-6 mm. 

 long. 3. B. arvensis. 

 Upper leaves clasping by an aurieled base. 4. B. campestris. 



1. Brassica NIGRA (L.) Koch. Black Mustard. M. p. 449. Fields and 



waste places. Summer. 



2. Brassica juncea (L.) Cosson. Indian Mustard. M. p. 449. Ballast. 



Summer. 

 Philadelphia— Wiasahickon (VP.). Northampton— (P.). 

 Camden — Kaighn 's Point (Ja.). 



3. Brassica arvensis (L.) B. S. P. Charlock. M. p. 450. Fields and 



waste places. Summer. 



4. Brassica campestris L. Butabaga, Turnip. M. p. 450. Fields and 



waste places. Summer. 

 C'am^Zen— Kaighn 's Point (Ja.). 



Brassica Napus L. Rape. M. p. 450. Ballast. Summer . 



9. DIPLOTAXIS DC. Rocket. 



Perennial ; stem leafy nearly to the inflorescence. 1. D. tenuifolia. 



Annual; leaves mostly basal, oblanceolate. 2. D. muralis. 



1. Diplotaxis tenuifolia (L.) DC. M. p. 450. Ballast. Summer. 



Camde?!— Kaighn 's Point (He.) (Ja,). 



2. Diplotaxis muralis (L.) DC. M. p. 450. Ballast. Summer. 



Ca7»7 den— Kaighn 's Point (Ja.) (Wn.). 



10. RAPHANUS L. 



Flowers yellow, fading white ; pod longitudinally grooved, 4-10-seeded. 



1. R. Raphanistrum. 

 Flowers pink or white ; pod not longitudinally grooved, 2-3-seeded. 



2. R. sativus. 



