402 



MEIOTAXY IN 



faces upwards ; it is oval and symmetrical, and a light 

 groove across its middle sliows it to be dimerous. The 

 placentae, accordingly, are ouly two. The groove on 

 the stigma and the placeritao are in Hne with the fertile 

 stamens. 



Here, therefore, is a symmetrical and complete, 

 regular, but dimerous orchideous flower, the first ver- 

 ticil of stamens not antheriferous, the second anthe- 

 riferous, the carpels alternate with these ; and here we 

 have clear (and perhaps the first direct) demonstration 

 that the orchideous type of flower has two stamineal 

 verticils, as Brown always insisted." 



Dr. Moore, of Glasnevin, kindly forwarded to the 

 writer a flower of Calanthe vestita (fig. 198), in which 

 there were two sepals only, anterior and posterior, and 



Fig. 198. Regular dimerous 

 flower of Colnrdhe vestita. 



Fig. 199. Regular dimerous 

 flower of Odontoglosstim AltxandrcB. 



two petals at right angles to the two sepals. The hp 

 was entirely wanting, but the column and ovary were 



