PLANTS GROWING IN WASTE SOIL. 297 



SHEPHERD'S=PURSE. 



Bursa Bursa-pastbris. 



FAMILY COLOUR ODOUR RANGE TIME OF BLOOM 



Mustard. Wliite. Scentlesi,. General. ^[prll-September. 



Florae r s : small; clustered in a long raceme. Calyx: of four sepals that 

 fall early. Corolla: of four cruciferous petals. Stavietts : six, two of which 

 are shorter than the others. Pistil: one. Pods: triangular; notched at the 

 apex; two-valved. Leaves: those of the base, clustered, incised; those of 

 the stem, arrow-shaped, partly clasping. Stem : branching. 



These insignificant little flowers crop out with much per- 

 sistency along the wayside. Their generic name is derived 

 from the pouch-like shape of their seed-pods. The plants are 

 widely distributed all over the globe, 



BLACK MUSTARD. 



Flowers: small; clustered in racemes. Pods: half an inch long, the seeds 

 dark, spicy to the taste. Stetn : three to six feet high ; branched. 



It is from the seeds of the black and white mustards that the 

 well-known condiment is made. For this purpose the plants are 

 extensively cultivated in Europe, and are sown as forage for 

 cattle, when they are cut down and fed to them before the seeds 

 are ripe. With us they flourish along the roadsides and are 

 rather troublesome weeds in some parts of the country. 



Sinapis alba, or white mustard, has single seeds ; the long 

 hairy pods are beaked. 



VENUS'S LOOKING-GLASS. 



Speciilaria perfolidta. 



FAMILY COLOUR ODOUR RANGE TIME OF BLOOM 



Campanula. Purplish blue. Scentless. General. May-September. 



Flowers : growing with the leaves along the stem. Calyx : three to five- 

 lobed. Corolla: wheel-shaped, with five almost linear lobes. Stamens: five. 

 Pistil : one; stigmas, three. Pods: triangular. Leaves: oblong with heart- 

 shaped bases ; clasping. Stem : hairy. 



This fancifully named little plant is one that bears cleistoga- 



