STROPHANTHUS 



545 



lapsed cells and which are more or less turgescent in the raphe, in 

 among the cells of which is included a small fibrovascular bundle, 

 having numerous spiral tracheae; endosperm of polygonal cells with 

 slightly thickened walls and containing an oily cytoplasm small 



FIG. 234. Transverse section of strophanthus seed; SC, seed-coat with unicel- 

 lular non-glandular hairs (//); R, raphe; E, endosperm; C, C, cotyledons 

 with fibrovascular bundle (V) and palisade cells (P). 



aleurone grains, and strophanthin, the latter being colored bright 

 green upon the addition of sulphuric acid; in the center occur two 

 large plano-convex cotyledons having a distinct epidermal layer, a 



