178 



ON SEEDLINGS 



Stem with primary internodes undeveloped. 



First leaves simple, cauline, alternate, petiolate, obovate- 

 oblong, obtuse, lobed (first one entire), slightly hairy, green, pin- 

 natinerved ; petioles rather long, channelled on the upper face. 



Raphanus sativns, L. 



For description of seed see above, p. 31 (fig. 62). 



Seedling (fig. 179). 



Primary root long, tapering, flexuose, with a few small lateral 

 rootlets. 



Hypocotyl short, stout, succulent, subsequently becoming swollen 

 to form the edible radish, glabrous, purple, merging into the root. 



Cotyledons opposite, foliaceous, with long petioles, penninerved, 

 glabrous ; lamina obcordate or obreniform ; petiole broadly and 



shallowly grooved on the 

 upper side, dilated and con- 

 nate at the base. 



Stem erect, shallowly 

 ridged and furrowed, sparsely 

 setose or scabrid, pale green, 

 sometimes suffused with pur- 

 ple ; 1st internode 2-6 mm. 

 long; 2nd l'5-8'5 cm., very 

 variable under cultivation. 



Leaves simple, cauline, 

 alternate, petiolate, sparsely 

 setose or scabrous, oblong or 

 linear, simply toothed or 

 serrate or variously lyrate - 

 pinnatifid ; segments obtuse 

 and entire or variously and 

 irregularly pinnatifid or 

 toothed. 



NOTE. When there is 

 abundance of moisture the 

 FIG. 179. BopftaniM sativus. Nat. size. P lants grow freely and the 



leaves are little cut up, vary- 

 ing from spathulate or oval to oblong, lyrate-pinnatifid or pinnati- 

 sect. If the plants are crowded or the weather dry they swell but 

 little at the root, run to flower, and at the same time produce 

 leaves that are bipinnatisect or irregularly cut into narrow shreds 

 or segments. 



