OCCURRENCE AND INHERITANCE OF SEX INTERGRADATION IN PLANTS 23 
phanerogamic floras. A definite terminology is used in botanical literature 
to cover this phenomenon. The terms hermaphroditic, dioecious, monoecious, 
andromonoecious, gynomonoecious , trimonoecious, gynodioecious , trioecious, 
androdioecious, etc., are used. 
A hermaphroditic form is one in which both pistils and stamens are 
borne in the same flower (perfect flower) , and in which all the flowers on a 
plant show the same arrangement of parts. Example: Lilium. 
A dioecious form is one in which the sexes are completely separated so 
that one plant bears male flowers only and the other plant female flowers 
only. Kxsimple: Elodea canadensis. 
A monoecious form is one in which the pistillate and staminate inflores- 
cences are borne separately on the same plant. Example: Begonia. 
An andromonoecious form is one that bears perfect flowers and male 
flowers on the same plant. Example: many Umbelliferae (Lotsy, 191 1). 
A gynomonoecious form is one that bears perfect flowers and female 
flowers on the same plant. Example: Atriplex and many Compositae 
(Lotsy, 191 1). 
A trimonoecious form is one that has three distinct types of flowers, 
male, female, and hermaphroditic. Example: Acer campestre (Lotsy, 191 1). 
A gynodioecious form is one that has both female and hermaphroditic 
individuals. Example: Plantago lanceolata. 
An androdioecious form is one that has both male and hermaphroditic 
individuals. Example: Caltha palustris (Lotsy, 191 1). 
Other combinations may occur. Staminate and pistillate inflorescences 
may appear on one individual and hermaphroditic on another. Example: 
Callitriche (Lotsy, 191 1). Male and female inflorescences may appear on 
one individual while another individual may be male. Example : Ceretopus 
(Lotsy, 1911). Male and female inflorescences may appear on one indi- 
vidual while another may have only female flowers. Example: Morus 
(Lotsy, 191 1). Hermaphroditic and male flowers may appear on one in- 
dividual while another is female only. Example: Gleditsia (Lotsy, 191 1). 
A trioecious form is one in which three distinct sex types occur, male, 
female, and hermaphroditic. Example: hemp. 
Correns (1913) offers the following diagram to show these conditions. 
Hermaphroditic 
Andromonoecious 
Trimonoecious 
6" 9 ? 
Gynomonoecious 
(Male) 
Androecious 
(Female) 
? 
Gynoecious 
