258 PHYSIOLOGY OF 



papilionacea, papilionaceous, irregular and 

 spreading, somewhat like a butterfly, 

 Lathy rus, t. 1108. The various petals 

 which compose such a flower are di- 

 stinguished by appropriate names, as 

 vexillum, standard, the large one at the 

 back ; al<£ 9 wings, the two side petals ; 

 and carina, the keel, consisting of two 

 petals, united or separate, embracing 

 the internal organs. In Trifolium all 

 the petals are sometimes united into one 

 at the lower part. 



incompleta, incomplete, when parts, which 

 analogy would lead us to expect, are 

 deficient, as in Amorpha, a papilionace- 

 ous flower apparently, but consisting of 

 the vea ilium only ; or Hitter a of Schre- 

 ber, a rosaceous one with a single la- 

 teral petal, seeming as if four others had 

 been stripped off. 



It is remarkable that irregular flowers 

 sometimes vary to regular ones in the 

 very same plant, as in Bignonia radi- 

 cans, Curt. Mag. t. 485; and Antir- 

 rhinum Linaria, Engl. Bot. t. 658 and 

 260. 



Linnaeus was of opinion that the Corolla 



