Diarmuid Breatnach
(Reading time: 2 mins.)
Can you tell which of the clovers growing wild in Ireland is the genuine Shamrock (Seamair óg)?
Now, while it is still in bloom, is a good time to spot the plant, the smaller leaves and the yellow (buí) flower on it is what really distinguishes it from its clover cousins, with their bigger leaves and flowers in white (S. Bhán, T. repens) or pink-red-purple (S. Dhearg, T. Pratense).
How do we know that the Seamair Bhuí (Lesser clover, Trifolium dubium) is the genuine “shamrock”? Well, perhaps we can’t be certain but in the 1890s out of a survey of opinions of people in a still quite traditional Irish society, T. Dubium emerged as the first choice.

Amateur botanist and zoologist Nathaniel Colgan (1851-1919) asked people from around Ireland send him specimens of what they believed to be an Irish shamrock, of which the two most common were the yellow clover followed by the white.1
A hundred years later, Dr Charles Nelson repeated the experiment in 1988 and found that yellow clover was still the most commonly chosen.2 According to Wikipeida, the yellow clover is the species nominated by the Department of Agriculture as the “official” shamrock of Ireland.
If you want to pick your own for St. Patrick’s Day, you’ll need to learn to identify it by its leaves because in Ireland it won’t be flowering in March. However, you can spot it now by its flowers and get a mental picture of the size of its leaves to retain in your memory.
THE IRISH AND THE SHAMROCK
What is it with the shamrock and the Irish anyway? The children’s fable of the Christian missionary Patrick using the leaf to explain the Christian Holy Trinity is just that, a fable, although repeated in one of the Wikipedia entries for “shamrock”.
Neither the Celts in general nor the Gaels in particular needed anyone to explain a three-in-one deity, since they had their own pagan trinities (Éiriu, Fódlha, Banba; the Mór-Righean/ Morrigu). Researchers have found no reference to any importance of the shamrock prior to 1681.3
Patrick himself, in what is considered his genuine autobiographical Confessio, never mentioned the shamrock once. My suspicion is that the shamrock-Christian-Trinity fable was fancifully created either by British settlers such as botanist Caleb Threkeld or by native Irish Christians around 1726.4
Although a few sources on line have claimed medicinal properties or druidic use for the shamrock, they never quote the actual original sources which may indicate that the references are undependable or obscure, if they exist at all.
Interestingly, writing a little before the 1798 Rising, Drogheda Presbyterian and United Irishman John Sheil used the shamrock as a reference for a different trinity, i.e that of Catholic, Protestant (Anglican) and Dissenter (all the non-Anglican Protestant denominations).
“ ….. the three-leaved plant ….
It is three in one
To prove its unity
In that community
That holds with impunity
To the Rights of Man.”5
However, green was the colour of the United Irishmen and at times of repression by the occupation forces and the Loyal Orange Order, a sprig of shamrock on St. Patrick’d Day could be a useful way of indicating resistance while also claiming it was a harmless obeisance to a Christian saint.
Nevertheless, even wearing it on St. Patrick’s Day might have been dangerous in some quarters as when The Wearing of the Green reported, in reference to the shamrock, that
“… It’s the most distressful country that you have ever seen
For they’re hanging men and women for the wearing of the Green.”
end.
FOOTNOTES
1https://en.wikipedia.org/wiki/Nathaniel_Colgan
2Ibid.
3“Thomas Dinely, an Englishman travelling through Ireland in 1681 noted that people of all distinctions wore crosses to commemorate the saint on this day, but noted that only the vulgar, as he called them, wore shamrock.” https://www.museum.ie/en-IE/News/From-shamrock-and-rosettes-to-Patricks-Pot
4https://www.dib.ie/biography/threlkeld-caleb-a8548
5The Rights of Man, by John Sheils. The air to which it is most commonly sung is that of the Irish Language song Eanach Cuain/ Anach Cuan but I have composed an original air for it and sing it a little faster than the song about that boat sinking tragedy.
SOURCES
https://en.wikipedia.org/wiki/Trifolium_dubium
https://www.dib.ie/biography/threlkeld-caleb-a8548
https://en.wikipedia.org/wiki/Nathaniel_Colgan
https://www.museum.ie/en-IE/News/From-shamrock-and-rosettes-to-Patricks-Pot
https://droghedalife.com/news/weaver-and-song-writer-john-sheil-the-topic-of-next-walking-tour