ACAXTHACE^E 



361 



colourless ; cotyledons rotund-obovate, minutely auricled at the 

 base, otherwise entire, plano-convex, or rather flat with rounded 

 lower edges, lying in 

 the broader way of 

 the seed with their 

 backs to the placen- 

 tal axis and their 

 basal edges vertical 

 to the retinaculum ; 

 radicle very short, 

 oblong, obtuse, much 

 longer than the mi- 

 nute auricles of the 

 cotyledons, lying in 

 the long basal point 

 of the seed. 



Seedling (fig. 581). 



Primary root long, 

 filiform, flexuose, 

 colourless, with slen- 

 der lateral rootlets, 

 but soon equalled or 

 superseded by strong 

 adventitious roots 

 from the base of the 

 hypocotyl. 



Hypocotyl erect or 

 decumbent, tapering 

 downwards, striated 

 longitudinally with 

 numerous, upwardly 

 adpressed whitish 

 hairs, pale green, 

 9-15 mm. long. 



Cotyledons obo- 

 vate, shallowly em- 

 arginate, tapering to 

 a cuneate base, petio- Fm _ 581 ._jj raw 

 late, indistinctly, irre- 

 gularly, alternately incurvinerved with the nerves uniting to form 

 an irregularly outlined submarginal one, glabrous except the petiole, 

 deep green above, pale or glaucous beneath ; lamina 8-9 mm. long 



themum leuconeurum. Nat. size. 



