312 



ON SEEDLINGS 



Cotyledon 



Linaria bipartita, Willd. (fig. 558). 



Primary root tapering downwards and giving off fibrous lateral 

 rootlets. 



Hypocotyl long, erect, slender, becoming thickened upwards, 



thinly glandular-pubes- 

 cent, 2-3-5 cm. long, 

 shining, green or more 

 or less stained with 

 red, proliferous at the 

 surface of the soil, giv- 

 ing off buds that even- 

 tually grow stronger 

 than the primary stem, 

 and elongate from 2- 

 6 cm. before producing 

 any leaves, appearing 

 thus as a continua- 

 tion of the hypocotyl. 

 If the upper part of the 

 hypocotyl and cotyle- 

 dons are removed after 

 germination, the seed- 

 ling has still power to 

 grow and establish it- 

 self by means of this 

 proliferation. 



Cotyledons linear, 

 obtuse, entire, tapered 

 at the base to a short 

 petiole, glabrous, bright 

 green above, paler or 

 subglaucous beneath, 

 often recurved or more 

 or less revolute at the 

 tip, ri-1'3 cm. long 

 including the very short 

 petiole, 2-25-2-75 mm. 



PIG. ^.-Linaria bipartita. Nat. size. * e > rather flesbv > & S ~ 



tinctly one-nerved. 



Stem herbaceous, erect, terete, thinly glandular-pubescent, 

 green or more or less stained with red at the base ; 1st internode 

 2-2-6 cm. long ; 2nd about 1-6 cm. ; 3rd shorter. 



