98 CRUCIFERAE 



2. S. altissimum L. TALL MUSTARD. 2-4 high : leaves deeply 

 pinnatifid : flowers yellowish-cream color : pods 2 / -4 / long, narrowly 

 linear. Sparingly adventized along railroads at Sheffield. May-August. 



4. SINAPIS L. 



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

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



1. S. alba L. WHITE MUSTARD. l-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. Rare. 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 5"-6" long. 2. B. arvensis. 

 Upper leaves clasping. 



Leaves somewhat pubescent. 3. B. campestris. 



Leaves glabrous. 4. B. Napus. 



1. B. nigra (L.) Koch. BLACK MUSTARD. 2-6 high : leaves deeply 

 pinnatifid, dentate : pods narrowly linear, 6 7/ long, smooth, on pedicels 

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

 September. 



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

 pinnatifid : pods linear, knotty, Q // -8 // long, smooth, on short ascend- 

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

 September. 



3. B. campestris L. TURNIP. l-3 high, glabrous: lower leaves 

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

 entire : pods 1/-2' long, on long spreading pedicels, long-beaked. Infre- 

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



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

 Infrequent along railroads. April-September. 



6. BARBAREA R. Br. 



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

 each cell. Cotyledons accumbent. 



1. B. stricta Andrz. WINTER CRESS. l-2 high: leaves lyrate- 

 pinnatifid : pods about I/ long, appressed on erect pedicels. Along rail- 

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



7. IODANTHUS T. & G. 



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

 one row in each cell. Cotyledons accumbent. 



