6 Flora of Denver. 



24. Sisymbrium canescens NUTT. (TANSY-MUSTARD.) 

 Yellow flowers very small, pods in elongated racemes shorter 

 than their pedicels. Seeds in two rows in each cell. Spring. 

 Common. 



25. Sisymbrium incisum ENGELM. Seeds in one row, pods 

 usually longer than the spreading pedicels. Clear Creek. 

 Found by Miss E. Eaton. 



26. Sisymbrium officinale SCOP. (HEDGE-MUSTARD.) In- 

 troduced along the Platte. Rare. 



27. Brassica nigraKocn. (BLACK-MUSTARD.) Introduced. 



28. Brassica campestris L. (TURNIP.) Introduced. 



29. Capsella Bursa - pastoris MOENCH. (SHEPHERD'S 

 PURSE.) Introduced. Common. 



30. Lepfdium campestre BR. Introduced. One plant 

 found at Valverde. Summer. 



31. Lepldium intermedium GRAY. (PEPPER-GRASS.) 

 Flowers inconspicuous, petals wanting or very small; round, 

 flat emarginate pods numerous in racemes. Common on the 

 plains in early summer. 



32. Lesquere'lla Ludoviciana DC. (BLADDER-POD.) This 

 is the Vesicaria Ludoviciana DC. of Coulter's Manual. Branch- 

 ing from the base, stellately pubescent. Flowers yellow and 

 pods obovate, globose. On the plains. Common in Cherry 

 Creek bottom near Broadway Bridge. Spring and summer. 



33. Physaria didymocarpa GRAY. (Twix-PoD.) Canes- 

 cent, low and prostrate with many stems bearing numerous 

 yellow flowers and large 2-celled inflated pods. Along the 

 Platte at Valverde. Spring and summer. 



34. Raphanus sativus L. The common radish introduced 

 and running wild. 



