MOBPHOLOGY OF REPRODUCTIVE ORGANS 165 



Such a modification of the structure was termed by Linnaeus 

 Peloria, a term which is now frequently applied by botanists in 

 the case of all flowers which thus pass from irregularity to regu- 

 , larity. In the Monkshood (fig. 322), the two petals which are 

 situated under the helmet-formed sepals already noticed {fig. 

 286) are each shaped somewhat hke an irregularly curved horn 

 placed on a long channelled stalk. 



The corolla is usually composed of but one whorl of petals, 

 and it is then termed simple ; but in some flowers there are 

 two or more whorls, in which case it is called multiple. When 

 the corolla is composed of but one whorl, its parts in a regular 



Fig. 322. 



Fig. 323. 



Fig. 322. A portion of the flower ol the Monkshood (4co«i7»»i), with nu- 

 merous stamens below, and two stalked somewhat lioni-shaped petals 



above. Fii/. 323. Flower of the Columbine (Aquilegia vulgaris) with 



each of its petals spun'ed. 



arrangement alternate with the sepals, although cases some- 

 times occur in which they are opposite to them. The causes of 

 these different. arrangements have already been explained under 

 the head of the Symmetry of the Flower. 



On the inner surface of the petals of many flowers we may 

 frequently observe appendages of different kinds in the form of 

 scales or hair-like processes of various natures. These are com- 

 monly situated at the junction of the claw and limb {fig. 327, a) ; 

 or at the base of the petals {figs. 324 and 326). Such appen- 

 dages may be well seen in the Mignonette {fig. 325), Buttercup 

 {fig. 324), Lychnis {fig. 327, a), and Grass of Parnassus {fig. 

 326). Similar scales may be also frequently noticed in gamo- 

 petalous corollas near the throat, as in many Boraginaceous 



