DISAPPEARANCE OF PAKTS. 191 



double, in which case the wanting set is generally (but not quite 

 alwa^'s) the inner, or the corolla ; 



Dichlamydeous, when both circles of the perianth (calyx and 

 corolla) are present ; 



Achlamydeous, when both are wanting, as in Fig. 365. (These 

 three terms are seldom employed.) 



Unisexual (also Diclinous or Separated) , when the suppression 

 is either of the stamens or the pistils. In contradistinction, a 

 flower which possesses both is Bisexual or Hermaphrodite. 



Staminate, or Male, when the stamens are present and the 

 pistils absent ; 



Pistillate, or Female, when the pistils are .present and the 

 stamens absent ; 



Monoecious (of one household), when stamens and pistils oc- 

 cupy different flowers on the same plant ; 



Dioecious (of two households) , when they occupy different 

 flowers on different plants ; 



Polygamous, when the same species bears both unisexual and 

 bisexual or hermaphrodite flowers. This maj r occur in various 

 wa}'S, from the greater or less abortion of either sex, either on 

 the same or on separate individual plants ; as Monceciously or 

 Diceciously Polygamous, according to the tendency to become either 

 monoscious or dioecious. Recently Darwin has well distinguished 

 the case of 



Gyno-dicecious, where the flowers on separate individuals are 

 some hermaphrodite and some female, but none male only ; and 

 Andro-dicecious, of hermaphrodite flowers and male, but no 

 separate female. The latter is a less common case. 



Neutral, as applied to a flower, denotes that both stamens and 

 pistils are wanting, a case neither rare nor inexplicable on 

 grounds of utility. (356, 504.) 



Sterile and Fertile are more loosely used terms. A sterile 

 flower may mean one which fails to produce seed, as a sterile 

 stamen denotes one which produces no good pollen, and a 

 sterile pistil one which is incapable of seeding. But commonly a 

 sterile flower denotes a staminate one ; a fertile flower, one which 

 is pistillate, if not also hermaphrodite. 



348. Suppressed Perianth. Almost universally, when the peri- 

 anth is reduced to a single circle, it is the inner, or corolla, which 

 is not produced. Or, rather, when there is only one circle or sort 

 of perianth-leaves, it is called calyx, whatever be the appearance, 

 texture, or color, unless it can somehow be shown that an outer 

 circle is suppressed. For since the calyx is frequently delicate 

 and petal-like (in botanical language, petaloid or colored, as in 



