186 LETTER XLIV. 



of the same tribe, which you will easily procure for 

 study. 



Very nearly allied to the Asclepias Tribe, are the 

 poisonous ApocyuumSy represented in the gardens by 

 the Periwinkle (Vinca), the Oleander (Nerium), and 

 the Apoc}Tium itself. They agree with the Asclepias 

 Tribe in their milky juice, and their appearance, but 

 differ in having the stamens free from each other and 

 from the stigma, the pollen in its usual state, instead 

 of being collected into bags, and in the want of any 

 coronet of secondary petals, except now and then a 

 single row of scales, growing in the mouth of the tube 

 of the corolla. 



As the plants of the Apocynum Tribe, with the 

 exception of those now mentioned, are not likely to 

 fall in your way, it is not necessary for you to be de- 

 tained with any account of them. 



EXPLANATION OF PLATE XLV. 



I. The Jasmine Tribe. — 1. Common white Jasmine (^iasmmwm 

 officinale), a, a flower-bud, shewing the imbricated twisted aestivation. 

 — 2. A corolla magnified, and opened to shew the position of the sta- 

 mens. — 3. A section of the calyx and ovary, exhibiting the position of 

 the ovules. — 4. A ripe fruit. — 5. The same cut across. 



II. The Asclepias Tribe. — 1. The Pink Asclepias (Asclepias 

 incarnata). — 2. A flower magnified; a a petals, b the column that sup- 

 ports the coronet of secondary petals, cc. — 3. One of the petals of the 

 coronet cut off" the column. — 4. A section of the same, to shew the 

 origin of the horn. — 5. A flower from which all the petals have been 

 removed ; a a sepals, b the column of the coronet, c c anthers, d d the 

 projecting angles formed by the sides of the anthers, e the membranous 

 appendages at the tip of the anthers, / the glands to which the pollen- 



