GROUP IV. PHANER00AMIA : ANGIOSPERJLE. 



509 



Tims, when thev- -arpels, the plane of symmetry is generally 



median ^ s are frequently median or, less com- 



p,, minor, Ribes alpinum, Fig. 324 A, B) : 



are placed obliquely (e.g. many Solanaceae, 



ti as Petunia, Fig. 324 D ; Datura, Hyoscyamus : Menyanthes 

 among Gentianacew, Fig. 324 1* 7 ; Saxifraga), the plane of symmetry 

 is oblique. Similarly, when the trynaeceum is monomerous 01 

 trimerous, if it is so situated that it > plane of symmetry coincides 

 with the median plane of th-- dower (e.g. with monomerous 

 Mirabilis, Mahomu with trimerous gynaeceum, Pole- 



D E F 



FIGK 324. Floral diagrams illustrating monosymmetry due to oligomery of the prynse- 

 ceum : A Vinca minor; B Ribes alpinum ; iu these the plane of symmetry is median : C Sxi- 

 fraga; D Petunia; in these the plane of symmetry is oblique: gl gland: a /3 prophylla : 

 E terminal flower of Gentiana verna, with median plane of symmetry: F lateral flower of 

 Menyanthes trifoliata, with oblique plane of symmetry ; p p prophylla. (After Eichler.) 



monium ; some Caryophyllaceae including most species of Silene, 

 Stellaria, Spergularia, etc.; some Campanulaceae; Deutzia crenata; 

 Sambucus Ebulus, etc.), then the plane of symmetry of the flower 

 is the median plane ; but when the plane of symmetry of the 

 gynaeceum. is oblique (e.g. with monomerous gynaeceum, Berberis, 

 Anacardium ; with trimerous gynaeceum, some Malpighiacese, 

 ^Esculus) the plane of symmetry of the whole flower is oblique 

 likewise. 



