A plant name that looks like anatomy
In current English, lobelia names a flowering plant of the large genus Lobelia, in the bellflower family Campanulaceae. Gardeners meet it as compact blues and whites for edging and hanging baskets, or as taller scarlet and blue border plants such as the cardinal flower. The blossoms are tubular and two-lipped, with five lobes: two upper, three lower. That split corolla makes the English word look as if it described a lobe. It does not. The noun is a learned borrowing of a New Latin genus name built from a botanist’s surname.
How the label reached English
The word did not rise through Old English or through everyday French. It entered as a scientific label and only later felt like an ordinary garden name. Historical dictionaries place the first clear English use in 1739, in Philip Miller’s Gardeners Dictionary, where a shrubby kind is listed under the Latin headword and given an English gloss. Merriam-Webster independently dates the English noun to the same year.
That 1739 printing sits between two Latin events. In 1703 Charles Plumier, describing plants of the Americas, dedicated a genus Lobelia to Matthias de l’Obel. Carl Linnaeus published the name in Species Plantarum in 1753, which is why modern botanical citation still runs through Linnaeus, often as a Plumier name taken up by him. English gardening prose already had the word more than a decade before that Linnaean volume. The path is borrowing from international botanical Latin, not native inheritance.
The surname inside the stem
Matthias de l’Obel — also Mathias de Lobel, and in Latin Matthaeus Lobelius — was a Flemish physician and botanist, born at Lille in 1538 and buried in London in 1616. He studied at Montpellier under Guillaume Rondelet, practised in the Low Countries and in England, served as a court physician on the Continent, and late in life became botanist to James I. With Pierre Pena he produced Stirpium adversaria nova, printed in London in 1570–71. Later books in Latin and Dutch tried to group plants by natural likeness, especially leaf shape, rather than only by medical use. He drew a practical line between grass-like plants with parallel veins and broad-leaved plants with netted veins, the contrast later called monocots and dicots, though he did not use those modern class names.
Plumier’s dedication, nearly ninety years after l’Obel’s death, followed a habit Plumier helped normalize: naming genera after people. The New Latin form is mechanical. Botanists took the surname as they Latinized it, Lobel or Lobelius, and added -ia, the usual suffix for a genus belonging to or connected with someone. There is no older Greek or Latin plant-root under the first two syllables. Sister honorifics point the same way: the maple Acer lobelii, the former family name Lobeliaceae (now treated as the subfamily Lobelioideae), and the alkaloid lobeline all commemorate the man, not a shared ancient word for a leaf-lobe.
L’Obel’s own French surname is a different puzzle. His books show a coat of arms with poplar, or abele, trees, a visual pun on the family name. That joke belongs to the herbalist. It does not explain the flower.
What English speakers used the word for
Once the genus label was available, the common noun meant a plant of that genus, or its bloom. That remains the core sense. A second, pharmaceutical sense grew around Lobelia inflata, called Indian tobacco: the dried herb used as an expectorant and emetic, and later associated in the United States with the herbalist Samuel Thomson. Nineteenth-century medical writing treats lobelia as a drug as well as a garden plant. The etymology does not change; only the referent widens from living specimen to prepared herb.
Garden English then built transparent compounds on the same stem — edging, trailing, great blue, scarlet — without reshaping the word. The three lower lobes of the corolla still tempt a link with English lobe, which comes from Greek lobos through Latin. The plants do have lobes. The name does not come from them. Sources that give an etymology stop at de Lobel and the suffix -ia.
A Latin gift shared across languages
Because the source was New Latin, the international forms stay close: French lobélie, German Lobelie, Dutch, Italian, Polish, and Swedish lobelia, Portuguese lobélia, Russian лобелия, Japanese ロベリア. They are learned copies of the same taxonomic label, not a native Germanic or Romance inheritance that English happened to share. English took the Latin nominative and made a countable noun of it, with the ordinary plural lobelias.
Taxonomists still write the genus as Lobelia L., with a type later fixed on Lobelia cardinalis. Miller’s 1739 entry shows that gardeners in England were already speaking the name while nomenclatural law, as later generations would define it, still waited on Linnaeus. The origin of the word lobelia is therefore a paper trail rather than a story about flower parts: a Flemish herbalist’s Latinized name, a French botanist’s dedication in 1703, and an English gardening dictionary that put the label into the vernacular in 1739.