A GUIDE TO THE WILD FLOWERS 137 



401. Black Mustard. Brassica nigra. A much branched 

 coarse herb, 2-6 ft. high. Lower leaves deeply lobed, the 

 terminal segment much larger than the lateral ones. Upper 

 leaves less cut and smaller, those near the flower cluster 

 uncut. Flowers in a terminal raceme, yellow, about 34 ""i- 

 wide. Pods }^ in. long, pressed against the stalk. In waste 

 places throughout North America. Native of Europe and 

 Asia. June-October. There are several weedy relatives. See 

 No. 383. 



402. Tumble Mustard. Norta altissima. (Sisymbrium al- 

 tissimum.) A tall weedy herb, often reaching 5 ft. high. 

 Leaves much lobed, but the lobes approximately of equal 

 size, not much toothed. Flowers about Ya in. wide, yellow, 

 in a terminal raceme. Pods lax, arching, about 3 in. long. 

 In waste places. Nova Scotia and Ontario to Virginia, and 

 westward. August. Fig. 402. See No. 383. 



403. Yellow Rocket. Barbarca Barbarea. (B. vulgaris.) A 

 weed of waste places, usually 1-2 ft. high. Lower leaves 

 stalked, 2-4 in. long, cut and lobed. Terminal lobe many 

 times larger than the 1-4 pairs of lateral ones. Flowers yel- 

 low, about Ys in. wide, in a terminal raceme. Pods about i 

 in. long, standing out from the stalk. Labrador to Virginia 

 and, more rarely, westward. May. A related species, B. 

 striata, has stiffly erect pods tightly pressed against the stalk. 

 See No. 383. 



404. Ci:laxdine. Chclidonvum ma jus. (Papaveraccac.) A 

 weak herb, 1-2 ft. high, with conspicuously yellow juice. 

 Leaves 4-6 in. long, much divided, bluish-green on the under 

 surface. Flowers yellow, about J/2 in. wide, in a small round- 

 ish cluster, from the leaf-joints, not at the ends of the 

 branchlets. Petals 4, sepals 2. Fruit a stalked pod, 1-2 in. 

 long. In fields, waste places, or sometimes in woods. Ontario 

 and Maine to Penn. and No. Carolina. Native of Europe. 

 May-October. Fig. 404. See Nos. 333 and 500. 



405. Leaves undivided, not cut or compound. 



Flowers about % in. wide ; leaves stem clasping 



Gold of Pleasure no. 406 



