270 ON SEEDLINGS 



Cola sp. 



Primary root long, tapering, stout, giving off few or no lateral 

 rootlets in the young state. 



Hypocotyl very short and indistinguishable from the root, or 

 undeveloped. 



PIG. 218. Sterculia heterophylla. Nat. size. 



Cotyledons four, each forming the quadrant of an oblong- 

 spherical mass, fleshy, very large, occupying the seed and subter- 

 ranean during germination, white if left uncovered, or pink, 

 reddish, or deep green according to exposure to light, petiolate. 

 Each of the four cotyledons has a roughly trigonal outline owing 



