Plural of Rhododendron

rhodyman(SE PA, USDA Z6)October 25, 2005

There seem to be multiple plural forms of rhododendron:



rhododendra (seems to be a British form but probably the correct form)

while the plural of azalea is always azaleas.

My impression is that rhododendron (or rhododendra) refers to members

of the genus Rhododendron and rhododendrons refers to rhododendron


For example rhododendron (or rhododendra) are Ericaceous and that

includes azaleas. [or] R. occidentale and R. viscosum are native

American rhododendron (or rhododendra) and are deciduous azaleas.

And there are pink rhododendrons growing next to the azaleas. [or]

America and Nova Zembla are popular East Coast rhodendrons.

I tend to think that rhododendron (or rhododendra) is the plural form

for the members of the genus rhododendron and hence a taxonomic term;

and that rhododendrons are rhododendron plants and hence a

horticultural term.

The distinction isn't always followed in books. Can anyone elaborate?

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kwoods(Cold z7 Long Is)

I think it's always "Rhodies" in the blue collar vernacular. Kinda simplifies things. ;Â)

Language and usage are always interesting though so I hope someone else might have some (more useful) insight.

    Bookmark   October 27, 2005 at 3:56PM
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rhodyman(SE PA, USDA Z6)

Here are some replies I got off line:

Susan wrote:
'rhododendron' is a second declension neuter noun in ancient Greek. It's correct plural is 'rhododendra'. But as with so many things, very few people use the correct form unless they are rather pedantic classicists. I mean, how many people use the word 'agendum' as a singular and 'agenda' strictly as a plural? And that's only Latin!

John wrote:
Question: Greek or otherwise how can you hybridize with a neuter noun? Maybe this is the reason so few of our crosses take.

Lyn wrote:
As far as the plural of Rhododendron goes, one needs to rember that although the International Code of Botanical Nomenclature considers this Greek-derived word to be "Latin", we do not have to. My preferred English plural for the common name is Rhododendrons (or rhododendrons, allowing for preferences as to font). I have no plural for the taxon name "Rhododendron" because, by definition, there can only be one of them.

    Bookmark   October 27, 2005 at 4:20PM
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kwoods(Cold z7 Long Is)

Smart folks! Thanks for sharing their knowledge.

lol, I like John's comment best! I honestly hadn't even considered the etymology before, "rose-tree", much less the plural form(s). I guess that exposes me as being someone fairly new to rhododendra ;Â)

As far as the proper plural form goes I think I'll just play it safe by keeping my primary interest deciduous azaleas.

Cool topic.

    Bookmark   October 28, 2005 at 10:05AM
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rhizo_1 (North AL) zone 7

Well, I'll be keeping up with this issue....I won't be able to sleep until this is resolved!!!

    Bookmark   October 30, 2005 at 6:27AM
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moeinoakforest(z5 IL)

Hmm...language "correctness" is usually set by common usage. So I did some hunting so see what is most common.

A quick Google search resulted in ~987,000 hits for rhododendrons but only 477 for rhododendra. That's a pretty solid tip o' the scales toward rhododendrons.

I also checked the American Heritage Dictionary, the Random House Unabridged Dictionary, AND the Merriam-Webster Dictionary (all in searchable electronic format--gotta love libraries). None had entries for rhododendra, but all returned results for rhododenrons.

Finally, the American Rhododendron Society uses rhododendrons. (See

    Bookmark   November 2, 2005 at 1:24PM
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rhodyman(SE PA, USDA Z6)

I got an authoritative answer from Ken Cox who is a rhododendron explorer and prolific author of Rhododendron texts. Here is what he said:

"You say 3 species of Rhododendron with a capital letter and italics, to show that this is a genus in Latin."

"However the same word can also be used to refer to the individual plant(s) too in this case, as this is really an 'English' word now, as far as I am concerned, is should be '3 rhododendrons'. I don't care for the Greek rhododendra much. All English words are derived from other languages: French, German, Latin, Greek, but we have decided to apply a universal rule that plural words are made by adding an 's'. The BBC worries about this issue greatly, as there comes a point when a word like 'stadium' which is Latin, with a plural 'stadia' becomes an English word and then the plural is 'stadiums'. They feel the need to issue guidelines on such words."

Examples of usage of the genus name are:

"Members of [italic: Rhododendron] are Ericaceous and include azaleas."

"[italic: R. occidentale] and [italic: R. viscosum] are native
American [italic: Rhododendron] species and are deciduous azaleas."

    Bookmark   November 3, 2005 at 9:37AM
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