1) Monogamous 
In botanical terms, monandrous simply means to have a single stamen. == In orchids == A distinction between monandrous and other flowers is particularly relevant in the classification of orchids. The monandrous orchids form a clade consisting of the subfamilies Orchidoideae, Vanilloideae, and Epidendroideae. The other subfamilies, Apostasioideae a...
• (a.) Of or pertaining to the monandria; having but one stamen.
With one anther.
with a single stamen
with a single stamen
Mo·nan'drous adjective (Botany) Of or pertaining to the monandria; having but one stamen. 
[adj] - having only one husband at a time
monandrous, monandry 1. A reference to a female who mates with a single male or the custom of having only one husband at a time. 2. In botany, belonging to a class of flower that has a single stamen.
adjective having only one husband at a time
of, pertaining to, or characterized by monandry. · · (of a flower) having only one stamen. · (of a plant) having such flowers.