Flowers and their Parts 139 



frequently called two celled, although they were originally four 

 chambered. Restio and Hibiscus have two microsporangia, but 

 in older botanies are called " one celled ". A split occurs in 

 the ridge of each lobe and the anthers are said to dehisce. 



Dehiscence takes place in different ways. The anthers of 

 JVatsonia, Antholyza^ 

 and Protea o'^e.w the 

 entire length. Cyan- 

 ella and many Heaths 

 open by little pores 

 at the tips. Do you 

 know of any other 

 that open in this way ? 



Cassytha and Ocotea y\g. i'io.—Gynandropsispentaphylla,T>C. Flower 



(Stinkwood) open by with large gynophore,^. (From Edmonds 



,• ^1 ,.j , . , and Marloth's " Elementary Botany for South 



llttJe lids upon which Africa".) 



the pollen adheres. 



In Adenandra, Barosma, and in some species of Albuca^ 

 what appears to be every other stamen bears no. anther. 

 In Adenandra they bear honey glands at the tip. Bodies 

 which are in the position of stamens, but which do not form 

 pollen, are called staminodia. 



Stamens may cohere by their anthers (monadelphous), or by 

 their filaments (synandrous or syngenesious) ; they may adhere 

 by their filaments to the petals (epipetalous), or to the sepals 

 (episepalous). 



The following terms refer to the number of stamens and to 

 their position : — 



Pleiostemonous stamens many or indefinite, twenty or 

 more. 



Diplostemonous, two whorls, each of equal number to the 

 petals, the outer whorl alternating with them. 



Obdiplostemofious^ as in diplostemonous, but the outer 

 whorl is opposite or anteposed to the petals. 



The Insertion of the Flower. — The end of the flower- 

 stalk, the receptacle or thalamus, is usually a shortened cone, 

 so that the four whorls of the flower are borne closely together. 



