‘/9, Brassica L. Mustard. 
Erect anmual herbs, glabrous or hispid with simple hairs. Basal 
leaves more or less pinnate or pinnatifid, those on the stems tending to 
simple. Flowers yellow. Pods columnar, linear, tapering into a seedless 
beak, the valves bearing 1-3 veins. Seeds in one row in each chamber. 
O Pods ascending on spreading pedicels; foliage pale green |, Be campestr 
o Pods pressed to the stems; foliage dark green and uneven 2, Be nigra 
1. Be campestris L. Yellow Mustard. Stems 50-100 cm. tall, or more, 
glabrous; leaves glabrous and glaucous, the basal ones irregularly toothed 
or somewhat lobed, the stem leaves entire, rounded at the base and strongly 
clasping the stems; petals pale yellow, 6=8 mm. long; pods 5-7 om. long, ? 
Soporting—tnte—> slender beak 10-12 mm. long. 
: 
An occasional weed in waste places. 
2. Be nigra (L.) Koch. Black \ustard. Stems 30-100 cm. tall or moro, : 
glabrous or bearing a few straight hairs; leaves glabrous or ‘sparingly hispid, — 
dark green, uneven, the lower ones pinnatifid, the terminal lobea very much 
larger, irregularly toothed, the stem leaves more or less toothed and incised; | 
petals bright yellow, 7-3 mn. long; pods 1.52 om. long, pressed to the stems ui 
taperiag—iato-y» slender abrupt beak 2-5 mm. long. 
An occasional weed in waste places. 
Sinapis arvensis Le Charlock. Resembling Brassica, the pod dehiscent, taperi 
into a stout flat beak which contains a single seed. An occasional weed, 
jebes 
