

TONKA 



327 



kept for some time, acquire an odor suggestive of fenugreek or 

 elm bark. 



Tonka. SEMEN TONCO, TONKA OR TONQUIN BEANS, TONKA 

 SEEDS. The ripe seeds of Coumarouna odorata and C. oppositifolia 



B 



FIG. 148. Foecum graecum: A, transverse section of seed; S, tests or se r cl-coat 

 consisting of palisade cells (pal), with thick cuticle (cut) and thick lamellated 

 walls (/); hour-glass-shaped column cells (sub); and parenchyma (p); E, 

 endosperm layer consisting of cells containing small aleurone grains (a); 

 and thick-walled mucilage cells (rnuc.); C, tissues of cotyledon consisting 

 of the two epidermal layers (ep) and cells containing small aleurone grains 

 (al). B, surface section of tissue of the seed-coat and endosperm; C, cuticle 

 and palisade cells with small lumina; P, palisade cells with thick radiating 

 porous walls and large lumina; S, sub-epidermal or column cells and paren- 

 chyma; E, cells of endosperm containing aleurone grains. A, after Winton; 

 B, after Tschirch. 



(Fam. Leguminosse, sub-fam. Papilionacese), trees growing in tropical 

 South America. The natives collect the fruits, crush them between 

 stones, separate the seeds and allow them to dry in the sun. They are 



