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EXPLANATION OF THE PLATES. 



PLATE I. 



Fig. 1. The chalaza of the Citron, opposite to the umbilicus, 

 (Sect. 120.) 



2. Cotyledons with the radicle. Seeds destitute of albu- 



minous substance^ The embrjon erect, (121, §83.) 



3. Section of Cardamon seed, having the umbilicus turn- 



ed upwards. The mealy albuminous substance is 

 dotted. The vitellus is marked by lines. Within 

 this lies the embryon, having its upper (in this case 

 its lower) end bent into a hooked shape, (121, 385, 

 386.) 



4. Seeds of Cardiospermum Halicacdbiim with the heart- 



shaped strophiolus^ (120.) 



5. Thick fleshy cotyledons wound within one another, 



(121.) 



6. Achenium of Centaurea ruthenica, with its bristly 



pappus and lateral umbilicus, (109, 120.) 



7. Silicle of Thlaspi bursa, (114.) 



8. Galbulus of Thuia orientalis, (116.) 



9. Strobilus of Alnus incana, (116.) 



10. Section of the seed of Strelitzia regmcE. The albu- 



minous substance is finely dotted : the embryon is \\\ 

 the centre, unevolved. A red tomentum forms the 

 strophiolus, (strophiolus stuppeus, 25, 120, 121.) 



11. Section of a grain of Wheat, in the upper end of 



which is the superficial unevolved embryon lying on 

 the scutdlum, by means of which it is connected 



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