262 DISTINCTIONS BETWEEN 



to say whether tliat be a Cal3^x or Corolla. 

 When green and coarse in texture like the 

 former, we call it so, as in Chenopodimn, 

 Engl Bot. t, 1033, and 1721—4, and the 

 natural relationship of this genus to Polygo- 

 mim, t. 1044, 989, 756, &c., leads us to 

 reckon the same part in the latter a coloured 

 calyx. On the other hand, when the part 

 present is delicate and finely coloured, like 

 the generality of Corollas, we denominate it 

 such ; more especially if the plant to which 

 it belonsrs be allied to others that have a 

 Calyx besides, as in Tidipo, I. 63, allied to 

 Lencojmn, t. 621, which has a Spatha. The 

 great Jussieu denominates this part in the 

 Tulip and other liliaceous plants, however 

 beautiful, a Calyx. His definition of a Corolla 

 is " that covering of a flower which is in- 

 vested with the calyx, being verj^ rarely 

 naked ; a continuation of the inner bark of 

 the flower-stalk, not of its cuticle ; not per- 

 manent, but mostly falhng off with the sta- 

 mens ; surrounding or crowning the fruit, 

 but never growing united with it; and having 

 its parts or segments for the most part alter- 

 nate with the stamens, which are equal to 

 them in number.'' By this rule the tube and 



