210 PISILNCTIONS BETWEEN 



performed by the Calyx perhaps, or even by the Fila- 

 ments of the Stamens ; as those of leaves are, in leafless 

 plants, by the stems. When a flower has only one cov- 

 ering, it is not always easy to say whether that be a Ca- 

 lyx or Corolla. When green and coarse in texture like 

 the former, we call it so, as in Chenopodium, Engl. Bot. t. 

 1033, and 1721 — 4, and the natural relationship of this 

 genus to Polygonum^ 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 de- 

 nominate it such ; more especially if the plant to which 

 it belongs be allied to others that have a Calyx besides, 

 as in Tulipa^ t. 63, allied to Leucojiim^ t. 621, which 

 has a Spatha. The great Jussieu denominates this part 

 in the Tulip and other liliaceous plants, however beauti- 

 ful, a Calyx. His definition of a Corolla is " that cov- 

 ering of a flower which is invested with the calyx, being 

 very rarely naked ; a continuation of the inner bark of 

 the flower-stalk, not of its cuticle ; not permanent, Lut 

 mostly falling off" with the stamens ; 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 num- 

 ber." By this rule the tube and six segments of a Nar- 

 cissus, t. 17, 275 and 276, constitute the Calyx, and then 

 surely what Jussieu calls a Crown, yi 1476, and Linnae- 

 us a Nectary, must be allowed the n i m of Corolla. 

 On the other hand, the Spatha becomes a Bractea. Con- 

 sequently the whole order of Liliaceous flowers in gene- 

 ral have a coloured Calyx only, which seems hardly ad- 



