46 A USTRALIAN BOTANY. 



hardly distinguishable from the corolla, as in the lilies, etc. 

 etc. Calyx and corolla alike, or of the same colour. 



The term monochlamydece (single or simple) is employed 

 to describe those plants which have but one floral 

 envelope or calyx. The Grevilleas, Hakeas, and Banksias 

 furnish examples. They have no petals (Apetalae). 



A dichlamydeous flower has two whorls, calyx and corolla. 

 Examples : — Wallflower, lily, Amaryllis, Narcissus, dock 

 (Rum ex), tobacco (Nicotiana). 



An achlamydeous (naked) flower has no floral envelope 

 or perianth, that is, neither calyx nor corolla. Examples : — - 

 Ash (Fraxinus), Willow (Salix), Birch (Betula). It may, 

 however, be protected by one or more bracts, as, for 

 instance, in the Carex and others of the Cyperacese, which 

 are common throughout Australia. 



Flowers are — 



(i) Monoecious (unisexual '), when the male and female 

 flowers are distinct, but on the same plant. 1 



(2) Dioecious, when the male and female flowers are on 

 distinct plants. 1 



(3) Polygamous, when there are male, female, and herma- 

 phrodite {bisexual) flowers on the same plant. 1 



Occasionally neuter flowers, or such as have no sexual 

 organs, occur, as in the blossoms of some Hydrangeas, 



The flowei'S of a plant or species may be said collectively to 

 be diclinous (a general term often used, meanitig unisexual), 

 whether Monoecious ; Dioecious, or Polygamous, and monoclin- 

 ous {liermaplwodite) when stamens a?id pistils are in the 



same flower. 



1 See examples, p. 64. 



