432 



ON SEEDLINGS 



longitudinally convolute, forming a thick cylinder, and when verti- 

 cally cut giving the appearance of four cotyledons ; radicle cylindri- 

 cal, bluntly pointed, somewhat longer than the cotyledons, with its 

 apex near the hiluni. 



Seedling (fig. 615). 



Primary root nearly vertical, light red, with numerous slender, 

 branched, lateral rootlets. 



Hypocotyl herbaceous, about 2 cm. long, 1 mm. thick, terete, 

 glabrous, brown. 



FIG. 616. Petiveria octandra. Embryo and 

 cotyledons, x 6. A, embryo partly unfolded. 

 B, outer and shorter cotyledon. C, inner 

 and longer cotyledon. 



na Icevis. 



Cotyledons not quite opposite, petiolate, unequal, about 1*5 cm. 

 long, a little over 1 cm. wide, broadly cordate or suborbicular, 

 shortly and obtusely cuspidate, trinerved, thin, glabrous, bright 

 green, not very persistent ; petioles slightly channelled, red, glan- 

 dular. 



Stem like the hypocotyl ; bases of leaves decurrent. 



Leaves simple, entire, cauline, alternate, exstipulate, petiolate, 

 alternately incurvinerved, glabrous, subreticulate, membranous, deep 

 green above, paler beneath. 



Nos. 1 and 2. Cordate, acute, incurvinerved. 



