CRUCIFEBAE. Id 



1. Eaphanus Raphanistrum L. Wild Radish. M. p. 450. Fields &nA 



waste places. Summer. 



2. Raphanus sativus T-. Garden Radish. M. p. 450. Escaped from culti- 



vation. Summer. 



11. BARBAREA R. Br, Winter Cress. 



Pods obtusely 4-angled, slender-pedicelled ; leaf -segments 1-4 pairs. 



Pods divergent or ascending. 1. B. Barbarea. 



Pods erect, appressed. 2. B. stricta. 



Pods sharply 4-angled, stout pedicelled ; leaf -segments 4-8 pairs. 



3. B. praecox. 



1. Barbarea Barbarea (L.) MacM. Yellow Rocket. M. p. 451. Low 



grounds and roadsides. Spring. 



2. Barbarea stricta Andrz. M. p. 451. Fields and waste places. Spring. 



3. Barbarea praecox (J. E. Smith) R. Br. M. p. 451. Waste places. 



Spring. 



Philadelphia— Up^er Wissahickon (Je.), Germantown (Me.). Bucks— 

 Sellersville, Doylestown, Penn Valley (Fr.). Montgomery— Shajinonville 

 (Cr.). Delaware— Concord (W. Tr.). Northampton— Easton, Porter 

 (B. C). 



Ca7)iden— Kaighn 's Point (Wn.). 6'aiem— Woodstown (Wa.). Hun- 

 terdon — Rosemont (C). 



Neiv CostZe— Greenbank, Commons. Now common. 



12. RORIPA Scop. Cress, 

 Flowers yellow. 



Plants perennial by creeping or subterranean branches, 



1, B. sylvestrig. 

 Plants annual or perennial, with fibrous roots. 



Fruiting pedicels 2-4 mm. long, stem diffuse. 2. jB. obttisa. 

 Fruiting pedicels 4-8 mm. long; stem erect. 



Stem nearly or quite glabrous; pods linear or linear-oblong. 



3. R. palustris. 

 Stem hispid-pubescent; pods globose or oval. 



4. R. hispida. 

 Flowers white. 



Leaves pinnately divided; pods linear. 5. R. Nasturtium. 



Leaves simple or the lower pinnatifid; pods oblong or globose. 



Terrestrial, tall; leaves crenate, or the lower lobed or pinnatifid. 



6, R. Armoracia. 



Aquatic; immersed leaves finely dissected. 7. R. Americana. 



1. Eoripa sylvestris (L.) Bess. M. p. 452. Wet meadows. Summer. 



2. RoRlPA OBTUSA (Nutt.) Britton. M. p. 452. Ballast. Spring and sum- 



mer, 

 Camden— Camden (He,). 



3. RoRiPA PALUSTRIS (L.) Bess. Marsh Cress. M. p. 452. Wet places and 



in shallow water. Summer. 



4. RoRiPA HISPIDA (Desv.) Britton. M, p, 453, Wet places. Summer^ 



Philadelphia— (P.). .Bwcfcs— Delaware River! (Fr,), Law easier— (P.). 

 Northampton— Tizston, Porter (B. C). Dauphin— (P.). 



