478 ON SEEDLINGS 



Leaves petiolate, subglaucous-green above, glaucous beneath, 

 obovate or varying to obovate-elliptic, obtuse, sometimes though 

 rarely emarginate. 



Bracts broadly ovate. 



Euphorbia Myrsinites, L. 



Hypocotyl 2-3 cm. long, light green. 



Cotyledons broadly oval, obtuse, entire, shortly petiolate, glabrous, 

 dark green above, lighter beneath, indistinctly trinerved. 



Stem erect, terete, herbaceous, light green, glabrous ; 1st inter- 

 node 3-5 mm. long ; 2nd shorter. 



First leaves opposite, sessile, entire, obovate-oblong, obtuse, 

 glabrous, subglaucous-green, indistinctly pinnatinerved. 



Euphorbia heterophylla, L. 



Hypocotyl thicker towards the base, light green stained with 

 red towards the soil, 1-5-2-25 cm. long. 



Cotyledons oblong, obtuse, entire, petiolate, glabrous, light 

 green, distinctly pinnatinerved. 



The seed splits transversely at the hilum, and the cotyledons 

 have often a considerable difficulty in getting rid of the testa, for 

 which purpose they are often thrown into folds. 



The membranous remains of the endosperm frequently stay on 

 the cotyledons long after the testa has been thrown off. 



Euphorbia platyphylla, L. 



Capsule small, roundish, warted, one-seeded. 



Seed subrotund or obovate, slightly flattened laterally, 1-1-25 

 mm. long ; testa crustaceous, light brown, smooth, slightly thick- 

 ened near the hilum ; hilum rather conspicuous. 



Endosperm copious, fleshy. 



Embryo straight, embedded in endosperm ; cotyledons oval or 

 suborbicular, obtuse, entire, plano-convex, closely adpressed, lying 

 in the broad way of the seed with their edges to the axis ; radicle 

 obtuse, entire, terete, about equal in length to the cotyledons. 



Seedling. 



Hypocotyl 3-4*5 cm. long, light green or colourless, with often 

 a slight tinge of red near the base. 



Cotyledons ovate-oblong, obtuse, entire, membranous, petiolate, 

 glabrous, light green and, like the leaves, indistinctly pinnati- 

 nerved. 



