276 Professor IIenslow's Examination 



DESCRIPTION OF THE PLATES. 



Plate XV. 

 The raceme (Fig. 1.) and radical leaf (Fig. 2.) of the Hybrid. 



Plate XVI. 



The various parts of the floral organs in the three plants contrasted together. The 

 details are at pages 4 and 5. 



As the same parts in the three columns are marked by corresponding letters in 

 three alphabets, viz. in Roman capital, small Italic, and Greek characters, it 

 will be unnecessary to refer to more than the figures in one compartment for 

 the purpose of explaining those in the others. 



I. Calyx. A. sepals separated and spread open: B. their marginal hairs magnified: 

 c. with supernumerary sepal : d. to I., arrangement of the sepals during in- 

 florescence. N. B. These sections do not refer to the arrangement of the 

 sepals in cestivation, which by some neglect I omitted to notice. 



■>. Corolla. 



/3. with supernumerary petal : y. ditto blended with the tube and forming a 

 notched lower lip. 



8. Male Organs. A. is of the natural size ; the rest are more or less magnified. 



A. Position of the stamens in the tube of the corolla: B. a front, and C. a back 

 view of the anthers : D. dry, and E. moistened grains of pollen, lying on 

 squares representing the ~ of an inch : F. a grain exploding upon the ap- 

 plication of moisture : G. three grains taken from off the surface of a withering 

 stigma, with their tubes (boyaux) exserted: H. a grain with three lighter 

 blotches on the surface. 



+. Female Organs. A. is of the natural size; the rest are more or less magnified. 



A. pistil : B. stigma : C. transverse section of the ovarium : D. an ovule at the 

 period of the flowers expansion, placed on a micrometer divided to the ^ of 

 an inch. 



