Monandrous
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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^[1] consisting of the subfamilies Orchidoideae, Vanilloideae, and Epidendroideae.^[2] The other subfamilies, Apostasioideae and Cypripedioideae, have at least two stamens.

References

1. ^ John V. Freudenstein and Finn N. Rasmussen (1999). "What does morphology tell us about orchid relationships?—a cladistic analysis". American Journal of Botany 86: 225–248. doi:10.2307/2656939. 
2. ^ Kenneth M. Cameron et al (1999). "A phylogenetic analysis of the Orchidaceae: evidence from rbcL nucleotide sequences". American Journal of Botany 86: 208–224. doi:10.2307/2656938. 

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