150 



BRASSICACEAE. 



1. Erysimum officinale L. 

 Hedge Mustard. (Fig. 173.) 

 Erect, l°-3° high, with rigid 

 spreading branches. Leaves run- 

 einate-pinnatifid, the lower peti- 

 oled, the upper nearly sessile; lobes 

 oblong, ovate or lanceolate, the 

 lower ones often recurved ; 'pedicels 

 about 1" long, erect in fruit; 

 flowers yellow, lA" broad; pods 

 linear, acuminate, glabrous or 

 slightly hairy, closely appressed; 

 valves with a strong prominent 

 midrib. [Sisymbrium officinale 

 Scop.; S. officinale leiocarpum DC] 



Common in waste and cultivated 

 grounds. Naturalized from Europe. 

 Widely naturalized in North America. 

 Flowers nearly throughout the year. 



7. BRASSICA [Tourn.] L. 

 Erect branching herbs, with 

 pinnatifid basal leaves, and showy 

 yellow flowers in elongated racemes. Siliques elongated, sessile, terete or 4- 

 sided, tipped with an indehiscent conic usually 1-seeded beak. Valves convex, 

 1-3-nerved. Seeds in 1 row^ in each cell, oblong, marginless; cotyledons con- 

 duplicate. [Latin name of the Cabbage.] About 80 species, natives of Europe, 

 Asia and northern Africa. Type species : Brassica oleracea L. 



Pods 4-sided, appressed, 5"-8" 



long. 1. B. nigra. 



Pods torulose, ascending, I'-l^' 



long. 2. B. integritolia. 



1. Brassica nigra (L.) 

 Koch. Black Mustard. 

 (Fig. 174.) Erect, 14°-5° 

 high, freely branching. 

 Lower leaves slender-peti- 

 oled, wdth 1 terminal large 

 lobe and 2-4 smaller lateral 

 ones, dentate all around, the 

 uppermost reduced to lance- 

 olate or oblong entire blades ; 

 flowers bright yellow, 3"- 

 5" broad; pedicels slender, 

 appressed, 2" long in fruit; 

 pods narrowly linear, 4- 

 sided, 5"-8" long, i" wide, 

 appressed; beak slender, 1"- 

 2'"' long; seeds dark brown. 

 [Sinapis nigra L.] 



Common as a weed in 

 cultivated grounds. Natural- 

 ized from Europe. Widely 

 naturalized in North America. 

 Flowers nearly throughout the 

 year. Occasionally cultivated 

 for its seeds. 



