98 CEUCIFEKAE 



2. S. altissimum L. Tall Mustaed. 2°-4° high : leaves deeply 

 pinnatifid : flowers yellowish-oream color : pods 2'-4'' long, narrowly 

 linear. — Sparingly adventized along railroads at Sheffield. May-Augnst. 



4. SINAPIS L. 



Flowers yellowish, racemose. Pods terete, beaked, constricted between 

 the seeds. Seeds roundish, not winged. Cotyledons conduplicate. 



1. S. alba L. White Mustakd. 1°-3° high : leaves pinnate, with 

 a large terminal leaflet : pods ascending : beak as long or longer than the 

 pod. — Cultivated grounds and along railroads at Kansas City and Inde- 

 pendence. Eare. May-June. 



5. BRASSICA L. 



Flowers yellow. Pods terete or four-sided, beaked, the beak usually 

 1-seeded. Seeds oblong, marginless. Cotyledons conduplicate. 



Leaves not clasping. 



Beak of fruit l"-2" long. 1. B. nigra. 



Beak of fruit h"-&' long. 2. B. arvenais. 

 Upper leaves clasping. 



Leaves somewhat pubescent. 3. B. campestris. 



Leaves glabrous. 4. B. Napus. 



1. B. nigra (L.) Koch. Black Mustakd. 2°-6° high : leaves deeply 

 pinnatifid, dentate : pods narrowly linear, 6" long, smooth, on pedicels 

 2"-4" long, appressed in fruit. — Abundant in waste places. June- 

 September. 



2. B. arvensis (L.) B.S.P. Chaklock. 2°-3° high, hispid : leaves 

 pinnatifid : pods linear, knotty, &"-H" long, smooth, on short ascend- 

 ing pedicels. -Frequent along railroads, especially at Sheffield. May- 

 September. 



3. B. campestris L. Turnip. 1°-3° high, glabrous : lower leaves 

 pubescent, pinnatifid : upper leaves glabrous, aurioulate, clasping and 

 entire : pods l'-2' long, on long spreading pedicels, long-beaked. — Infre- 

 quent in waste places and along railroads. May-September. 



4. B. Napus L. Rapb. Like the last, but leaves entirely glabrous. — 

 Infrequent along railroads. April-September. 



6. BARBARBA E. Br. 



Flowers yellow. Pod long-linear, four-sided. Seeds in one row in 

 each cell. Cotyledons accumbent. 



1. B. atricta Andrz. Wintbe Ckess. 1°-2° high: leaves lyrate- 

 pinnatifid : pods about 1' long, appressed on erect pedicels. — Along rail- 

 roads near the foot of Burge Park Bluffs, Kansas City. Eare. May. 



7. lODANTHTTS T. & G. 



Petals long-clawed, purplish. Pods long-linear, oylindrio. Seeds in 

 one row in each cell. Cotyledons accumbent. 



