66 MUSTARD FAMILY. 



H- -i- Leaves {except upini the flower-stem) thin and green ; flnwers small 

 and bright yellow. 



B. Pe-Tsai, Hailey. Ciiisksk Cabbagk, Pk-Tsai. Leaves repaiitl- 

 siiiuate or duly rarely somewhat lyrate, smooth or very nearly so, the 

 l)etiole thick and broadly winged ; root annual, fibrous ; leaves form a 

 loose head, resembling Cos Lettuce. China. 



B. Rapa, Linn. Tuuxip. Leaves prominently lyrate or interrupted 

 below, hairy ; the root tuberous. 



» * Fhoit green or but slightly glaucous when infloicer; leaves of the 

 flower-stem not prominently clasping ; flotoers small and yellow. 



B. nigra. Koch. Black Mustard. Leaves somewhat hairy and divided ; 

 pods erect in the raceme or spike, .smooth, short, 4-sided (the valves having 

 a strong midrib), and tipiu'd with the short, empty, conical base of a 

 slender style; .seeds dark Inown, small, pungent. Cultivated and in 

 waste places. Eu. ® 



B. diba, Boiss. Wiiiri-; Mistard. Leaves all pinnatifid and rougli- 

 iiairy ; pods spreading in the raceme, bristly hairy, the lower part 

 thick and few-seeded; seeds large, pale brown. Run wild, from 

 Eu. ® 



B. Sinapistrum, Boiss. Ciiaklock. Pods knotty, nearly smooth, 

 fully one third comprised in a stout 'i-edged beak which is either 

 empty or 1-seeded ; upper leaves barely toothed. AYeed in grain fields. 

 Eu. ^® 



21. CAPSELLA, SHEPHERD'S PURSE. (Name means « /M?^' pocZ.) 

 (Lessons, Figs. 402, 403.) ® 



C. Bursa-Pastdris, Moench. Commox S. The commonest of weeds, in 

 waste places ,• root-leaves pinnatifid or toothed, those of the stem sagit- 

 tate and partly clas])ing ; small white flowers followed by the triangular 

 and notched pods, in a long raceme. 



22. LEPlblUM, PEPPERGRASS, CRESS. (Greek : little scale, from 

 the polls.) Our common species have incised or pinnatifid leaves, and 

 very small white or whitish flowers. ® 



* Plant green. 



H- Leaves large, clasping ; hairy. 



L. campestre, Br., has run wild (from Eu.) eastward. Known by its 

 strict habit, entire or only toothed leaves, and ovate winged rough pod. 



■»- ■*- Leaves small, tapering at base, the lower ones at length falling; 

 smooth. 



It. Virginicum, Linn. \Yn,i) P. Cotyledons accumbent ; petals pres- 

 ent, anil usually imly 2 stamens ; the little pods scarcely margined at the 

 notched tops ; seeds flat. A common weed by roadsides. 

 • L. intermedium, (hay. Cotyledons incumbent as in the following; 

 pod minutely wiiig-margined at top ; petals minute or 0. W. N. Y. and 

 N. 111., N. and \V. in dry places. 



L. ruderale, Linn., introduced from Europe, is much less common, more 

 branched, with no petals, the smaller scarcely notched pods and turgid- 

 seeds marginless. ^ ^ p^^^^^ ^^^^^ glaucous. 



L. sativum, Linn. Garden Cress. Cultivated as a salad plant, has 

 petals, and the larger ovate pods are winged and slightly notched at 

 the top ; leaves (except the very uppermost) compound or much divided. 

 Eu. 



