PETALODY. 201 



realised. Fig. 156 is a diagram showing the presence 

 of two additional labella ^\dthin the ordinary one in 

 a species of Gatasetum^ and repre- 

 senting two petaloid stamens, 

 thus evidently completing the 

 outer staminal whorl, of which 

 there is usually but a single 

 representative (see Peloria, Mul- 

 tiplication, Prolification). In 

 some of these double orchids it is, yio,. 156. Diagram of 

 however, necessary not to con- flower of Catasetum, with 

 found a petaloid condition of the t^o^a^u^- 

 existing column with the development of usually sup- 

 pressed stamens in a petaloid form. Thus, in Lycofffe 

 Shinneri the column is frequently provided with two 

 petal-hke wings, which might readily be supposed to 

 be two stamens of the inner whorl adherent to the 

 column ; a little attention, however, to the relative 

 position of these adventitious wings is generally suffi- 

 cient to enable the observer to ascertain the true 

 nature of the appearance.^ 



Some forms of duplicate or hose in hose corollas are 

 apparently due, not so much to the formation of a 

 second corolla within the first, as to the presence of an 

 inner series of petal-like stamens, which, by their 

 cohesion, form a second pseudo-corolla within the first. 

 The staminal nature of this pseudo-corolla is inferred 

 from the occasional presence of anthers on it.' In 

 Datura fastuom, as well as in Gloxinia, a pseudo- 

 corolla of this kind sometimes occurs with the addition 

 of a series of petaloid stamens attached to its outer 

 surface.^ 



When the petalody specially affects the anther-lobes, 

 as in Arhutus, retunia. Fuchsia^ ^c, the venation of 

 the petal-like portion is very frequently laminar, thus 



See also C. Morren, " Sur les vi-aies fleurs doubles chcz les Orchi- 

 dees," ' Bull. Acad. Roy. Belg.,' vol. xix, part ii, 1852, p. 171. 



* C. Morren, 'Bull. Acad. Belg.,' vol. xx, 1863, part ii, p. 284 

 {Syringa). 



' Rep. Bot. Congress,' London, 18GG, p. 135, t. vii. f. 14. 



