MUSTARD FAMILY 103 



pinnately cut toward the base, obtuse ; stem leaves oblong or lanceo- 

 late, entire or somewhat toothed, with an arrow-shaped clasping 

 base. Flowers white or yellowish, on stout pedicels. Pods ovate, 

 winged, slightly notched, tipped with a very small persistent style. 

 Fields and waste ground, becoming a troublesome weed. Naturalized 

 from Europe. 



V. CAPSELLA Medic. (BURSA) 



Annual. Stem, erect, downy, with branched hairs. Racemes 

 terminal, becoming elongated in fruit. Flowers small, white. 

 Pod obcordate or triangular, flattened contrary to the parti- 

 tion, shorter than the spreading pedicels.* 



1. C. Bursa-pastoris Medic. SHEPHERD'S PURSE. Root long and 

 straight. Stem branching above, downy below, smooth above. 

 Lower leaves forming a rosette at the base of the stem, irregularly 

 lobed or pinnately cut ; stem leaves lanceolate, clasping, toothed or 

 entire. Sepals downy, about ^ as long as the petals. Pod triangular, 

 notched, or cordate at the apex. Seeds several in each cell. A com- 

 mon weed.* 



VI. RAPHANUS L. 



Annual or biennial herbs. Basal leaves lyrate. Flowers in 

 long racemes, white or yellow, purple-veined. Sepals erect. 

 Pods rather long, slender-beaked, not splitting open but some- 

 times breaking across into 1 -seeded joints. 



1. R. Raphanistrum L. WILD RADISH, JOINTED CHARLOCK. A 



stout, hairy annual, 1-2 ft. high. Leaves cut into remote segments, 

 which are coarsely toothed or serrate ; terminal segment largest. 

 Flowers yellow, turning whitish or purplish. Pods necklace-shaped, 

 and with a long beak. A common weed eastward. Naturalized from 

 Europe. 



2. R. sativus L. COMMON RADISH. Similar to No. 1, but with 

 pink or white flowers. Root fleshy, conical or turnip-shaped. Pod 

 fleshy, 2-3-seeded, the beak often longer than the seed-bearing portion. 

 Cultivated from Asia and occasionally self-sown in cultivated ground. 



VII. BRASSICA L. 



Branching herbs. Leaves often pinnately cut. Flowers in 

 racemes, rather large, yellow. Sepals spreading. Pods nearly 

 cylindrical, sometimes tipped with a beak which does not 

 open. Seeds globular. 



