CRUC1FEILE 



167 



uncertain number are spathulate and entire or oblong and variously 

 dentate. 



Ultimate leaves lyrate, pinnatifid or pinnatipartite ; terminal lobe 

 ovate, obtuse, irregularly dentate ; middle lobes ovate, obtuse, very 

 unequal on the anterior side, with an extra longitudinal vein and 

 irregularly toothed or lobed ; basal lobes small. 



Cauline leaves ovate, lanceolate and linear, deeply auricled at 

 the base, amplexicaul, sessile, serrate. 



Lepidium sativum, L. (figs. 171-2). 



Fruit a silicula ; septum narrow, laterally compressed, each 

 carpel boat-shaped and falling away from the placenta, containing 

 one, rarely two seeds. 



FIG. 170. Capsella Bursa-pastoris. Nat. size. 



Seed oblong, trigonous, pale brownish-yellow, with the narrow or 

 dorsal aspect (containing the radicle) lying in the keel of the carpel, 

 to which it conforms roughly in shape, with the broader ventral 

 aspect to the septum, curved upon itself so that the basal part 

 of the radicle lies in a separate cavity from that of the cotyledons ; 

 hilum at the upper end of the seed ; micropyle superior on the dorsal 

 aspect. 



Embryo large, curved upon itself, conforming in shape to the 

 seed, yellowish; cotyledons tripartite (v. ante, p. 52), shortly petio- 

 late ; middle segment oblong, obtuse, longer than the other two, which 

 are similar but shorter and packed on the back of the middle one, all 

 placed with their backs to the placenta ; radicle nearly as long as the 

 incumbent cotyledons, cylindrical, pointed. 



