True enough. As to my botany example, you don't really hear of plants being referred to as he, she, boys, girls, men or women. Or cow/bull etc., as with humans

True enough. As to my botany example, you don't really hear of plants being referred to as he, she, boys, girls, men or women. Or cow/bull etc., as with humans and other animals. Just male and female. To reiterate one of my other comments, the time of appearance and usage of the terms show how language changes over time. As of yet, I'm unaware of "homogender" and "heterogender" terms, although they can be translated directly into known/existing sexuality categories that aren't the same as heterosex and homosex.