# Plantago lanceolata

Plantago lanceolata is a species of flowering plant in the plantain family Plantaginaceae. It is known by the common names ribwort plantain, narrowleaf plantain, English plantain, ribleaf, lamb's tongue, and buckhorn. It is a common weed on cultivated or disturbed land.

## Description

The plant is a rosette-forming perennial herb, with leafless, silky, hairy flower stems, growing to 45 centimetres (17+1⁄2 in) tall, exceptionally 90 cm (35 in). The basal leaves are lanceolate spreading or erect, scarcely toothed with 3–5 strong parallel veins narrowed to a short petiole. The flower stalk is deeply furrowed, ending in an ovoid inflorescence of many small flowers each with a pointed bract. Each inflorescence can produce up to 200 seeds. Flowers are 4 millimetres (1⁄8 in), with a green calyx and brownish corolla, four bent-back lobes with brown midribs and long white stamens.

### Reproduction

The mode of reproduction can vary among populations. Reproduction occurs sexually, with the pollen being wind dispersed for the most part, though the plant is occasionally pollinated by bees.

### Chemistry

Plantago lanceolata contains phenylethanoids such as acteoside (verbascoside), cistanoside F, lavandulifolioside, plantamajoside and isoacteoside. It also contains the iridoid glycosides aucubin and catalpol.

## Distribution and habitat

Plantago lanceolata is common in Europe, including Britain. It is widespread throughout the British Isles, but scarce on the most acidic soils (pH < 4.5). It is present and widespread in the Americas and Australia as an introduced species.
Considered to be an indicator of agriculture in pollen diagrams, P. lanceolata has been found in western Norway from the Early Neolithic onwards, which is considered an indicator of grazing in that area at the time.
The species can live anywhere from very dry meadows to places similar to a rain forest, but it does best in open, disturbed areas. It is therefore common near roadsides where other plants cannot flourish; it grows tall if it can do so, but in frequently mowed areas it adopts a flat growth habit instead. Historically, the plant has thrived in areas where ungulates graze and turn up the earth with their hooves.

### Invasiveness

Ribwort Plantain is considered an invasive species across the United States and Australia. Accidently introduced to the USA in 1822, it has since spread throughout the country, especially in disturbed habitats like lawns (surviving even when mowed), meadows, and roadsides. While generally not toxic to livestock, it can be unpalatable and reduce the quality of pasture for grazing animals. Additionally, in areas where it thrives, ribwort can contribute to respiratory issues such as hay fever due to its pollen and wind-born nature.
One of the plant's most notable traits is its ability to remain dormant for up to 177 years, which is among the longest dormancy periods observed in plants. This allows the plant to remain unnoticed for long periods before suddenly expanding and becoming problematic. The plant is now considered a noxious weed in states like Iowa and Michigan, and its spread continues to impact local flora and fauna. Ribwort’s ability to lay dormant for long periods before reawakening makes it a particularly tricky invader, as it can seem to emerge suddenly and expand rapidly when conditions become more favorable, contributing to its success as a persistent and disruptive species..

## Ecology

Songbirds eat the seeds, and the leaves are eaten by rabbits.
The iridoid glycosides the plant contains make it inedible to some herbivores, but others are unperturbed by them—for example, the buckeye butterfly Junonia coenia, whose larvae eat the leaves of P. lanceolata and ingest the iridoid glycosides to make themselves unpalatable to predators.

### Insect predation

Plantago lanceolata is host to many different species of the order Lepidoptera. Species such as Junonia coenia, Spilosoma congrua, and Melitaea cinxia lay their eggs on P. lanceolata plants so they can serve as a food source for the larvae when they hatch. The iridoid glycosides in the plant leaves accumulate in the caterpillars and make them unpalatable to predators.

### Infection by powdery mildew

Podosphaera plantaginis is a powdery mildew fungus that infects P. lanceolata. All of the P. lanceolata populations are infected by several strains of this powdery mildew fungus. Once the populations are infected, the symptoms are minimal at first. Then, after a few weeks or months lesions start to appear covering the entire surface of the leaves and the stem, making it very noticeable. Another species that infects P. lanceolata is Golovinomyces sordidus. Both of these mildews are obligate biotrophs, meaning that they can only infect living tissue. They cover the surface of the leaves and extend hyphae into the cell matrix in order to extract nutrients.

#### Resistance to powdery mildew

After the populations are infected, they react in different ways. Some populations of P. lanceolata are more susceptible to different strains of powdery mildew. Also, some populations have multiple resistance phenotypes where on the other hand, others may only have one resistance phenotype. Overall, the populations that have the highest variety of resistance phenotypes will have the highest survival rates particularly when rates of infection are high.

## Uses

Plantago lanceolata is used frequently in herbal teas and other herbal remedies. A tea from the leaves is used as a cough medicine. In traditional Austrian medicine, the leaves have been used internally (as syrup or tea) or externally (fresh leaves) for treatment of disorders of the respiratory tract, skin, insect bites, and infections. The leaves can be eaten when very young. The flower buds have a mushroom-like flavour and can be used to make stock.

## In culture

Children use the plant in a game where the flower's head is "shot" off the end of stalk; it has alternately been called "rifle", "1 o'clock gun" (after the gun that fires everyday from Edinburgh Castle), and other names. To play the game, one would pluck a stalk and wrap a loop of the distal end of the stem around the section of stem closest to the flower's head. The loop is tightened so it stops up behind the flower's head and the stem is pulled backward until the flower head pops off. The stalk is slightly elastic so when the flower head separates, it (the head) flies off in the direction the stalk is pointed like a gun, hence the gun-related names given to it.
In the West Country of England the same game is called 'cannonballs'. Another game played with the plant in Britain and Ireland is a variation of conkers; a child tries to knock off the flowerhead of their friendly rival's stalk using their own stalk with a fast downward thrust. This pastime is known vernacularly as 'dongers' in Kent and 'Carl doddies' (along with the plant itself) in Scotland.